223 Comments

  1. April 20, 2011 at 9:01 pm

    zubair shah

    very nice. i will try but it will not perform

    Reply
  2. May 30, 2011 at 10:19 pm

    joao

    were i buy a electret condenser mic? is that like a mic ok a pc?

    Reply
  3. June 1, 2011 at 6:52 am

    Tuyen

    Very cool! I have tried, and it worked very well :D, thanks for showing!

    Reply
  4. June 11, 2011 at 6:03 pm

    Karan

    Realy good ; i was in search of it since a long time.Thanks a lot

    Reply
  5. July 4, 2011 at 7:39 pm

    Ash

    is this on/off circuit for clap switch???

    Reply
    1. July 6, 2011 at 8:39 pm

      LDRENGINEERING.ORG

      no. it just switches on LED for a definite time.

      Reply
  6. July 6, 2011 at 1:35 pm

    chinmay

    please gie me values of resistors

    Reply
  7. July 6, 2011 at 1:36 pm

    chinmay

    give me values please

    Reply
    1. July 6, 2011 at 8:38 pm

      LDRENGINEERING.ORG

      You can see the values from the schematic.

      Reply
  8. August 5, 2011 at 5:10 pm

    venky

    how to download this vedio

    Reply
    1. August 7, 2011 at 6:50 pm

      LDRENGINEERING.ORG

      You can download this video using a Youtube Video downloader, for example: http://www.youtubedownloader.org/

      Reply
  9. August 12, 2011 at 3:53 pm

    vibhor jain

    very nice i have applied in my bed room for swith off and on table lamp
    thanks buddy for uploading such a innovative vedio

    Reply
  10. September 19, 2011 at 4:56 pm

    yuuri

    please help me with its pcb lay-out because i want to try it as my project

    Reply
  11. September 23, 2011 at 5:35 am

    Jessie

    Hello, do you have a pcb layout for this one?
    Thanks a lot.

    Reply
  12. September 25, 2011 at 10:22 am

    Kenzo

    Just wondering, is it a 24V power supply?
    And, how can I make it possible to lit up multiple LEDs?
    Thanks. (:

    Reply
    1. September 25, 2011 at 1:26 pm

      LDRENGINEERING.ORG

      No, you can use 6V-9V power supply. You can glow multiple LED also. You need to know how to calculate current and voltage for many LEDs. You can calculate here: http://led.linear1.org/led.wiz

      Reply
  13. October 4, 2011 at 5:48 am

    Jayson

    what’s the voltage of the 100uF capacitor? Thanks

    Reply
    1. October 4, 2011 at 9:37 am

      LDRENGINEERING.ORG

      You can use 10V to 25V, that means capacitors rated, 100uF/10V or 100uF/16V or 100uF/25V. But your power supply should be 6V-9V only. If you are using power supply more than 9V, then, use capacitors rated 16V or 25V.

      Reply
      1. February 2, 2013 at 10:34 am

        michael

        what alternative can i used if 100uf is not available?

        Reply
        1. February 7, 2013 at 12:35 pm

          Sagar Sapkota

          you can use 10uF, 1000uF and any other also. But use electrolytic capacitor only.

          Reply
  14. October 4, 2011 at 12:33 pm

    Jayson

    Thanks….I have another questions… Are the resistors’ wattage is 1/4 watts? And this 100N capacitor, is it equal to 104 ceramic capacitor? Thanks in advance.

    Reply
    1. October 4, 2011 at 2:16 pm

      LDRENGINEERING.ORG

      Yes, the wattage is 1/4 watts. and the capacitor 100nF is 104. Actually, the capacitor code works like this: 104= 10 0000pF=10 and 4 zerospF= 100nF= 0.1uF. You can see other capacitor codes from here: http://drakedev.com/pic/capacitors.php

      Reply
  15. October 4, 2011 at 4:39 pm

    Jayson

    Thanks a lot!

    Reply
  16. October 5, 2011 at 8:40 am

    Jayson

    I am done making this circuit and it worked… But how can I reconstruct it to operate on a 220 V output? Do you have a schematic diagram for this kind of circuit? Thanks.

    Reply
    1. October 5, 2011 at 9:58 am

      LDRENGINEERING.ORG

      I have just attached a new schematic for operating bulb at 220V. Before you read about this project, I recommend you to read about relays. read from here: http://www.ldrengineering.org/how-to-use-a-relay/
      After you completely know about relay, then only work with 220V, otherwise, it can be dangerous. be careful and best of luck. keep on commenting.

      Reply
  17. October 5, 2011 at 10:53 am

    Jayson

    Do you have a video or a picture of that circuit?

    Reply
    1. October 5, 2011 at 11:11 am

      LDRENGINEERING.ORG

      No, I don’t have. But you can visit http://www.ldrengineering.org/how-to-use-a-relay/ to know about relay. there are pictures about connecting relay in the circuit.

      Reply
  18. October 5, 2011 at 11:21 am

    Jayson

    Okay… I’ll try to build this..

    Reply
  19. October 7, 2011 at 4:00 pm

    Jayson

    Can a breadboard carry this circuit?

    Reply
    1. October 8, 2011 at 10:24 am

      LDRENGINEERING.ORG

      Yes, you can try it on breadboard. There won’t be any problem, I am sure. but, if you are working with 220V, be careful.

      Reply
  20. October 7, 2011 at 4:10 pm

    John

    Does the 220V circuit turn on and turn off by means of claps unlike the DC-supplied one w/c turns off automatically after few seconds?

    Reply
    1. October 8, 2011 at 10:06 am

      LDRENGINEERING.ORG

      220V circuit turns off automatically after few seconds. If you want to make it keep it turned off or on, then you should merge a toggle switch with clap switch. You can get the idea of making a toggle switch from here:
      http://www.ldrengineering.org/toggle-switch/
      I recommend you to make a light operated switch first so that you can understand how this toggle switch works. Link is here: http://www.ldrengineering.org/light-operated-switch-2/
      In the LIGHT OPERATED SWITCH CIRCUIT, replace LDR with the condensor microhone used in clap switch and adjust sensitivity with the VR1- 10K resistor connected from the base of transistor Q2 to ground.
      When you adjust this 10K resistor, it will be more or less sensitive to your clap. I am sure that, when you clap, this circuit will switch on the LED till you don’t give another clap and vice versa. After making this project, replace the LED with a relay to glow 220V bulb. again visit: http://www.ldrengineering.org/how-to-use-a-relay/ to get the idea of using a relay.
      After you understand this project, try the same concept on the original clap switch circuit. For this week, please try this project. If you cannot make it, I will show you after a week, but please don’t forget to remind me. best of luck.

      Reply
  21. October 10, 2011 at 12:17 pm

    John

    What I have to do to increase the turn off- time of the 220V circuit?

    Reply
  22. October 10, 2011 at 12:18 pm

    Jayson

    The same question. 🙂

    Reply
  23. October 10, 2011 at 12:27 pm

    Zian

    Do you have a schematic of the 220V on/off clap switch? ty

    Reply
    1. October 10, 2011 at 9:38 pm

      LDRENGINEERING.ORG

      check out this: http://www.ldrengineering.org/clap-switch/clap-switch-2_ldr_engineering-2/ . click on the figure to enlarge it.
      read more about it on this page: http://www.ldrengineering.org/clap-switch/

      Reply
  24. October 10, 2011 at 9:35 pm

    LDRENGINEERING.ORG

    The turn on and turn off time depend upon the resistor R3 and the Capacitor C2 of 555 timer. time on= 1.1xR3xC2. Therefore change the values of R3 and C2 and see the change in on time. To know more about monostable mode of 555 timer, see here: http://www.ldrengineering.org/modes-of-ne555-monostable-and-astable/

    Reply
  25. October 11, 2011 at 3:35 pm

    Pam

    I have tried the first circuit and it worked. But when I tested it several times, it had stopped working well. When I clapped, it turned on but did not turn off. It began to blink and when I tried to clap again, it turned off and on while blinking and ticking….

    Reply
  26. October 11, 2011 at 3:38 pm

    Cesar

    Can you post a diagram of the 220V Clap on-off switch? TY

    Reply
  27. October 11, 2011 at 4:33 pm

    Zian

    I have tried the first circuilt, the one that is operated by 6V battery and it worked. But when I tested for several times, it did not work well. When I clapped, it turned on but never turned off. Then it began to blink. I clapped once again and it turned off and on while blinking and ticking even I’ve tested in a silent place. I also tried to used another timer.

    Reply
  28. October 12, 2011 at 5:08 pm

    Marvin

    just wanna ask. will it matter if we use 10V relay instead of 6V stated in ur schematic?

    Reply
    1. October 12, 2011 at 5:47 pm

      LDRENGINEERING.ORG

      If you use 10V relay, then power supply should be above 10V . 6V relay is OK for 6V, 9V or 12V power supply.

      Reply
    2. October 12, 2011 at 8:43 pm

      LDRENGINEERING.ORG

      As you can see that my schematic has 6V power supply, it cannot run/drive 10V relay, so, it does not work with the given schematic. In order to make it run with 10V relay, change the power supply to 10V-12V. It works with 12V also.
      So, first change your power supply to 12V then connect you 10V relay. I hope this helps you. best of luck

      Reply
  29. November 10, 2011 at 8:26 pm

    Vin

    hi, a question. If i want to add more LEDs where do i put them and if i want the LEDs to switch off when i make a sound rather then waiting for them to off on its own how do i do that?

    Reply
    1. November 10, 2011 at 8:36 pm

      LDRENGINEERING.ORG

      You will have to do some calculations and add a transistor because if you add more LEDs, the voltage and current levels will change. Besides, if you want to turn off immediately, follow this instruction:
      If you want to make it keep it turned off or on, then you should merge a toggle switch with clap switch. You can get the idea of making a toggle switch from here:
      http://www.ldrengineering.org/toggle-switch/
      I recommend you to make a light operated switch first so that you can understand how this toggle switch works. Link is here: http://www.ldrengineering.org/light-operated-switch-2/
      In the LIGHT OPERATED SWITCH CIRCUIT, replace LDR with the condensor microhone used in clap switch and adjust sensitivity with the VR1- 10K resistor connected from the base of transistor Q2 to ground.
      When you adjust this 10K resistor, it will be more or less sensitive to your clap. I am sure that, when you clap, this circuit will switch on the LED till you don’t give another clap and vice versa. After making this project, replace the LED with a relay to glow 220V bulb. again visit: http://www.ldrengineering.org/how-to-use-a-relay/ to get the idea of using a relay.
      After you understand this project, try the same concept on the original clap switch circuit. For this week, please try this project. If you cannot make it, I will show you after a week, but please don’t forget to remind me. best of luck.

      Reply
  30. November 11, 2011 at 4:33 pm

    Vin

    hi, me again i did like you said by replacing the LDR with a condenser microphone but the only thing that happens is the relay clicking and i need to tap the microphone only then will the relay click, clapping or snapping my fingers wont make it click. hope you can help me again.

    Reply
  31. November 15, 2011 at 12:07 am

    sebastian

    Hi Sagar. Let me tell you that this proyect works perfectly, I just want to ask you one question: How can I do more amplification in order I can clap for a far distance and activate the bulb?

    Thanks in advance!

    Reply
    1. November 15, 2011 at 7:50 am

      LDRENGINEERING.ORG

      Hello friend, I want answer the first question first, AMPLIFICATION: If you mean sensitivity, then, change the value of resistance R5. In the schematic, there is 4.7K, now you change it to 1K or 300Ohm or 10K and see the change, the sensitivity changes, which means that the LED switches on from far or near.
      Regarding your second question, I have already given the schematic on the same page, see below the clap switch page, there is another schematic with the name, CLAP switch GLOWING 220V bulb. Before you make a circuit glowing 220V bulb, learn about relay, otherwise, it can be dangerous. To use a relay, read this article:http://www.ldrengineering.org/how-to-use-a-relay/

      Reply
  32. November 25, 2011 at 10:36 am

    ralph

    i have a question.. i done the connection but when i connected it to the 6v supply, the led just turn on for a seconds then it turn off. it just like that. if i make sound(clap) led didnt light up., i checked again the connection and nothings wrong about it. i just followed the video.. then when i connect it again to the supply (6v) the same thing happened.. the led just turn on then off.

    Reply
    1. November 25, 2011 at 4:39 pm

      LDRENGINEERING.ORG

      Your microphone might not be working. just check it once. You need to have at least 2 extra microphones while doing this project. These microphones are very sensitive to heat, so, you mic must have been broken while soldering. Please try again. In the same page, I have shown about how to connect such microphone.

      Reply
  33. November 25, 2011 at 10:37 am

    ralph

    another question. which is better to use? a 1/2 w resistor or a 1/4 w resistor???

    Reply
    1. November 25, 2011 at 4:37 pm

      LDRENGINEERING.ORG

      Use 1/4 Watt resistor. When there is no additional information about watt, you should understand that it means 1/4 watt.

      Reply
  34. December 4, 2011 at 7:06 pm

    matteo

    hi, i’m italian,i don’t speak very well english..:) can i have the PCB of this beautiful project,please!? 🙂

    Reply
    1. December 12, 2011 at 9:51 pm

      LDRENGINEERING.ORG

      Sorry, I don’t have PCB now. But I can make and send you later.

      Reply
  35. December 5, 2011 at 2:37 pm

    Arihant

    what is the function of transistor circuit in the diagram?

    Reply
    1. December 12, 2011 at 9:50 pm

      LDRENGINEERING.ORG

      The transistors together work as switch. the main function of the transistor is to amplify current.

      Reply
  36. December 10, 2011 at 12:49 pm

    alisha

    we can use another type of microphone instead of condenser mic ,or not?

    Reply
    1. December 11, 2011 at 6:49 am

      LDRENGINEERING.ORG

      Yes, you can use it.

      Reply
  37. December 12, 2011 at 2:56 pm

    Bela

    I have a question, what should I do for the LED to remain lit on till i clap again.. ?
    should i remove the cap, replace with another component, using the clap-switch schematic with the 555 timer.
    What should I do ?
    Thanx in advance.

    Reply
    1. December 12, 2011 at 9:48 pm

      LDRENGINEERING.ORG

      Please read other comments. I have explained about this several times. If you want to make it keep it turned off or on, then you should merge a toggle switch with clap switch. You can get the idea of making a toggle switch from here:
      http://www.ldrengineering.org/toggle-switch/
      I recommend you to make a light operated switch first so that you can understand how this toggle switch works. Link is here: http://www.ldrengineering.org/light-operated-switch-2/
      In the LIGHT OPERATED SWITCH CIRCUIT, replace LDR with the condensor microhone used in clap switch and adjust sensitivity with the VR1- 10K resistor connected from the base of transistor Q2 to ground.
      When you adjust this 10K resistor, it will be more or less sensitive to your clap. I am sure that, when you clap, this circuit will switch on the LED till you don’t give another clap and vice versa. After making this project, replace the LED with a relay to glow 220V bulb. again visit: http://www.ldrengineering.org/how-to-use-a-relay/ to get the idea of using a relay.
      After you understand this project, try the same concept on the original clap switch circuit. For this week, please try this project. If you cannot make it, I will show you after a week, but please don’t forget to remind me. best of luck.

      Reply
  38. December 14, 2011 at 12:01 pm

    MADHUBALA

    IT’S VERY NICE AND WONDERFUL.

    Reply
  39. December 17, 2011 at 8:54 am

    arif

    very nice

    Reply
  40. December 21, 2011 at 2:26 pm

    Amatuer

    How much does a condenser mic cost in india……………….any idea plz help me???

    Reply
    1. December 21, 2011 at 3:53 pm

      LDRENGINEERING.ORG

      Must be around Rs. 10-15, even cheaper

      Reply
  41. December 22, 2011 at 4:05 pm

    Nirmal kumar

    can yu post any charger with auto cut off

    Reply
  42. December 22, 2011 at 4:19 pm

    Nirmal kumar

    how much this project cost …..

    Reply
    1. December 22, 2011 at 4:24 pm

      LDRENGINEERING.ORG

      If you are from India, it costs less than 50 rupees.

      Reply
  43. December 22, 2011 at 4:37 pm

    Nirmal kumar

    thanx ….

    Reply
  44. December 22, 2011 at 4:42 pm

    Nirmal kumar

    can i connect the transistor switch circuit to hold on the lamp ….

    Reply
    1. March 14, 2012 at 8:25 pm

      Arushit Mudgal

      NO…..It will need a relay to turn on the circuit

      Reply
  45. December 22, 2011 at 4:45 pm

    Nirmal kumar

    no that auto turn off circuit s taking more i need circuit 10v input and output 6v or 7v 500ma …. thanx advance …

    Reply
  46. December 24, 2011 at 10:08 am

    Nirmal kumar

    i tried this project but when connect the battery the condesar mic get heat rapidly kindly heil plz ………..

    Reply
    1. March 14, 2012 at 8:24 pm

      Arushit Mudgal

      which battery are you using : 9V or 4AA cells connected in series to give 6V

      Reply
  47. December 24, 2011 at 10:53 am

    Nirmal kumar

    i used ne555 ic and transistors are bc547b plz help me plz ……

    Reply
  48. December 24, 2011 at 2:29 pm

    Nirmal kumar

    Plz help .. Replay me plz ..

    Reply
  49. December 25, 2011 at 9:19 am

    Nirmal kumar

    Thanx a lot its work well .. Thanx a lot ..

    Reply
  50. January 3, 2012 at 10:38 pm

    Colin Mitchell

    You should not connect an electret microphone to the base of the transistor. It needs a 4k7 to 10k resistor in series with the microphone.

    Reply
    1. March 14, 2012 at 8:19 pm

      Arushit Mudgal

      why not?!?!it is not required to connect any other resistor as there is no resistance required between microphone and base of transistor…..

      Reply
  51. January 4, 2012 at 10:25 am

    Anonymous

    i like this circuit…

    Reply
  52. February 22, 2012 at 4:57 pm

    Sujit Kumar

    Hoe much will cost for meking this project in India??/
    Please help me…..

    Reply
    1. February 22, 2012 at 6:35 pm

      buildcircuit

      less than Rs. 30

      Reply
      1. March 14, 2012 at 8:17 pm

        Arushit

        No it did not cost less than Rs. 30 as the mic itself is now a rare component and that’s why it cost around Rs. 10 and the 555 IC is also around Rs. 5 ……..so it will take about 50 to 60 rupees

        Reply
  53. February 28, 2012 at 4:14 pm

    Dhruv

    Can you please help me…and tell me where to get the materials for this project..i really need this for my science day!!. 🙂

    Reply
    1. February 28, 2012 at 7:38 pm

      buildcircuit

      If you are from India, you can buy the components from your local electronic store, I am sure that you can get from there. In case if you don’t find microphone, take out from a useless telephone. I am sure it also works.

      Reply
  54. March 3, 2012 at 6:53 pm

    Will

    Hi

    I built this several times and I cannot get the circuit to work. I checked my connections over and over. I’m using two 3904 transistor instead of the BC547 and I’m using a 9volt battery. I rebuilt the circuit from the 555 timer down, and everything from the 555 timer works. But when I test the circuit from the 3904 transistors nothing. Please help…I really need this project to work. I also need to use 9volts, the circuit needs to power something using 9 volts.

    Will

    Reply
    1. March 6, 2012 at 6:53 pm

      buildcircuit

      I just made another clap switch using 2N3904. It works well. Please checkout here:http://www.buildcircuit.com/combine-two-dark-sensors-and-make-an-easy-clap-switch/

      Reply
  55. March 14, 2012 at 12:25 pm

    Dhruv

    What if i need to do this for my room..and my room is pretty large..so what should be my setting so that i can turn the light on with a clap..easy!

    Also can you give me a list of items needed..as i could not fid that anywhere~!

    Reply
  56. March 17, 2012 at 2:04 am

    Iori Rasseyndyll

    AWESOME PROJECT….but i am having a problem with the circuit that this circuit switches the relay without any sound given to mic after five to 6 minutes and also holds the relay for a very long time sometimes..plz reply me on this

    Reply
    1. March 17, 2012 at 11:14 am

      buildcircuit

      Please do that project in modules. Please follow the steps from this tutorial: http://www.buildcircuit.com/combine-two-dark-sensors-and-make-an-easy-clap-switch/
      if it still doesn’t work, I will help you.

      Reply
  57. March 21, 2012 at 1:21 pm

    vineet

    ive mounted this exact circuit shown in the video about six to seven times now and not once has the led illuminated in my attempts…ive changed the microphones thice in these attempts…please help

    Reply
    1. March 21, 2012 at 2:45 pm

      buildcircuit

      Please follow clap switch circuit described on this page: http://www.buildcircuit.com/combine-two-dark-sensors-and-make-an-easy-clap-switch/
      It’s always good to break a big project into small modules, make separately and join them together. In this project also, I have shown how to make a clap switch integrating two dark sensors made from transistors and 555 timer.

      Reply
      1. March 25, 2012 at 3:46 pm

        vineet

        thanks i got it working…but again it doesnt work consistently!also what steps should i take if i wish to mount it on a copper clad pcb??please reply asap

        Reply
    2. November 24, 2012 at 11:32 pm

      yash

      connect mic directly to the transistor ..instead of shorting it using connecting wire!!

      Reply
  58. March 26, 2012 at 3:25 pm

    SHELLY

    SIR CAN I USE BC548 INSTEAD OF BC546?PLEASE RPLY ME ASAP …

    Reply
    1. March 26, 2012 at 4:37 pm

      buildcircuit

      Yes. You can use BC547/548/549 for your project.

      Reply
  59. March 26, 2012 at 7:18 pm

    SHELLY

    can u please give me the full details of voltage across every point?????

    Reply
    1. March 26, 2012 at 7:48 pm

      buildcircuit

      Please measure using multimeter. We don’t measure voltage across all points because there are several projects in this website. I hope you understand.

      Reply
  60. March 31, 2012 at 8:12 pm

    vinu

    can i use 9v battery for this circuit???is this work for circuit??

    Reply
    1. May 2, 2012 at 5:40 pm

      Arushit Mudgal

      Yes you may

      Reply
  61. April 13, 2012 at 8:34 pm

    hussnain

    good simple and efficient

    Reply
  62. April 20, 2012 at 7:41 am

    oolesh

    hello sir am new in electronics can i know if i can use any NPN on this curcuit please?? can i use 2n2222 am from mauritius can’t get BC547/548/549 and what’s the voltage do i need for the capacitors (Q1;Q2,Q3) can i use (C1,C2,C3 10v please please!!!always i stuck on capacitor voltage is it necessary??anyone can reply me please HELP ME

    Reply
    1. April 20, 2012 at 9:46 am

      Sagar

      Hello friend, The project should work with any kind of NPN transistor, it should also work with 2N2222. You can also try with 2N3904 or BD139 or any other. And regarding capacitor voltage, if you are using 6V power supply, use any capacitor with rating more than 6V. the point is, the voltage rating of capacitor should be greater than the power supply voltage. So, you can use any capacitor with rating above 6V, for example, you can use 10V, 25V, 50V, 100V, etc.
      If you are using 12V power supply, please use capacitor with 25V rating. I hope this helps.

      Reply
      1. April 20, 2012 at 11:16 am

        oolesh

        thanks alot SIR i will try this curcuit!!the second one is it clap on clap off curcuit 250 volts??

        Reply
  63. May 15, 2012 at 8:47 pm

    EE

    I’ve tried this several times and followed every step, but whenever I connect the battery, the led turn on and stays on even without clapping. What might be causing the problem? PLEASE HELP!

    Reply
    1. May 15, 2012 at 9:01 pm

      Sagar

      If it does not work, please try this: http://www.buildcircuit.com/combine-two-dark-sensors-and-make-an-easy-clap-switch/

      AND try this: http://www.buildcircuit.com/clap-switch-using-3-different-modules/

      Try to make the circuit in modules, please follow the instructions carefully. Best of luck.

      Reply
  64. May 16, 2012 at 3:00 am

    japhet adusitiya

    hi am japhet and am final year student in one of the polytechnics existing in my country and it happen that my lecturer ask me to carry out my project on a clap operated switch and honestly speaking i need and urgent help please i want to know the function of each transistor.capacitor,resistor,condenser mic,rely,bread board and the source voltage help me please thank U as U do so.

    Reply
    1. May 16, 2012 at 9:45 am

      Sagar

      Hello, for understanding the working of clap switch, please read this post: http://www.buildcircuit.com/clap-switch-using-3-different-modules/
      and go to different modules pages and try to understand the project in modules. Follow the instructions exactly. for example, make dark sensor first and understand it. Then, make a monostable mode 555 timer, understand it, then finally combine those two project and replace LDR with microphone. If you read all the projects, you will understand the working of all the components.

      Reply
  65. June 21, 2012 at 9:25 pm

    Prasanna Kumar

    Dear Sir,
    I am trying to build a clap operated switch for 220 Volts A.C supply.
    As the schematic is given above, it is given for 6 Volts D.C power supply. But if I will use 9 Volts D.C power supply then what should be the values of other components? (say resistors, capacitors, diodes & transistors)

    Reply
    1. June 21, 2012 at 10:30 pm

      Sagar

      Even if you are using 9V, you don’t need to change ratings of other components.

      Reply
      1. June 22, 2012 at 11:25 am

        Prasanna Kumar

        Thanks a lot sir….

        Reply
  66. June 22, 2012 at 12:12 am

    Esteban

    Can I use Batery 9v for circuit: http://www.youtube.com/watch?feature=player_embedded&v=TeDHWHRVpm8
    ??????????

    Reply
  67. June 23, 2012 at 9:08 am

    anurag

    dear sir i dont hav 47k registor available in near by market can u plzz suggest me any other if i can use instead 47k ??

    Reply
    1. June 23, 2012 at 9:26 am

      Sagar

      yes, you can use any resistor close to that value, say 56k or you can also put 22k+22k in series.

      Reply
  68. June 26, 2012 at 7:06 pm

    Julian

    Hello I was wondering if you could help me with this :
    How would I go about trying to change this circuit so that the clap switch activates a small motor for a very brief period of time and not a LED?
    Thanks (:

    Reply
    1. June 27, 2012 at 9:32 am

      Sagar

      If you are using just a simple motor, then just remove LED and put motor in place of that.

      Reply
  69. July 1, 2012 at 2:40 pm

    Anton

    At first the circuit did not work. I replaced the BC547 transistors with 2N2222. you also do need thw electret mic which you can buy at Jaycar. The circuit work when you make a loud clap or whistle close to the mic.
    I enjoyed building it and have learnt something about the working of circuits.
    The best part for me isto do the research when the circuit does not work.
    Awesome little circuit.

    Reply
  70. July 1, 2012 at 6:52 pm

    lokendra

    sir i have made it on smaller bread board it seems from the video that i have used smaller breadboard do u have any solution

    Reply
  71. July 1, 2012 at 6:57 pm

    lokendra

    sir please reply fast one time i have made it its not working please tell me any solution i have to submit tommorow do u have any other video of clapping switch usin gmicrophone so please post it and tell me solution its seems that microphone is not working how can nthis be possible please tell me fast

    Reply
  72. July 4, 2012 at 6:40 pm

    de silva

    hello sir,
    in that clap operated relay circuit, THAT RELAY IS A 6V DC. wHEN THE RESISTORS ARE PARARAL OHMS VALUE REDUCE 50% OK. 100 PARAREL 100 = 50.. THAT WAY 12V DC RELAY CAN I USE WITH THE PARAREL RESISTOR?…
    IF CAN WHIC H VALUE RESISTOR CAN I PARAREL WITH MY 12V DC RELAY.

    THANKS..

    Reply
    1. July 4, 2012 at 7:15 pm

      Sagar

      Since the power supply is 6V, you should use 6V relay. Try 12 V power supply for 12 V relay.

      Reply
  73. August 1, 2012 at 9:29 pm

    faraz shahid

    good…..
    that actually works in first attempt
    what should we have to do if we want to clap or wissile from a large distance

    Reply
  74. August 11, 2012 at 10:42 am

    priya

    very nice.this circuit with video is very much helpful in a way

    Reply
  75. August 23, 2012 at 6:47 pm

    vnayak

    sir. i made this circuit and the resultant is the led is glowing but not switching off….please reply fast regarding solution

    Reply
  76. September 11, 2012 at 2:03 pm

    Nanda Dane

    Hi sir! Thank you for this resource.. I am going to make this for my project.. Can I ask what is the wattage value of all the resistors used? Please reply.. thank u!!

    Reply
    1. September 11, 2012 at 2:36 pm

      Sagar

      the used resistors are 1/4 watt.

      Reply
      1. September 26, 2012 at 12:16 pm

        Nanda Dane

        Thank you for your reply sir.. How about the Electrolytic Capacitor? Can I use 16V? thanks in advance..:)

        Reply
        1. September 26, 2012 at 1:19 pm

          Nanda Dane

          and Sir, is this different from clap-on clap-off circuit? if different, can you help me make this into clap on clap off one? thanks.. ^_^

          Reply
  77. October 23, 2012 at 9:22 pm

    Renee

    Hi.
    I just saw your video.
    I need to make this for my school project.
    Can you please tell me what all i will need to construct it and what is a 4.7k?
    Thanks!

    Reply
    1. October 24, 2012 at 8:19 am

      Sagar Sapkota

      Hello,

      4.7k is a resistor. You can buy a kit on buildcircuit.net and you can get all the components for making the clap switch. check this: http://www.buildcircuit.net/product/clap-switch

      Reply
  78. November 1, 2012 at 12:51 pm

    Saurav

    Hi

    I have tried the circuit on a breadboard.

    Can you tell me if there is a difference between a condenser mic and an electret microphone.
    I have a condenser mic in the circuit. Will it work if I use the condenser mic?

    thanks for the circuit and video

    Reply
    1. November 1, 2012 at 8:47 pm

      Sagar Sapkota

      It’s same. You can use a mic phone in general phone also.

      Reply
      1. November 8, 2012 at 6:48 am

        Saurav

        thanks …its working fine for me!

        now i need to jazz it up a lil bit for display. i wish to connect something in series with the LED like a motor or a sound making IC.

        Reply
  79. November 4, 2012 at 6:54 am

    Anushka

    Where could i find the working for this project?

    Reply
    1. November 4, 2012 at 10:44 am

      Sagar Sapkota

      There is a video on this page.

      Reply
  80. November 5, 2012 at 7:57 pm

    dinesh

    it is not working

    Reply
  81. November 5, 2012 at 8:00 pm

    dinesh

    it is not working
    led glowing

    Reply
  82. November 7, 2012 at 8:20 pm

    leosmith1331

    hi do you think you can make this with a pcb. if so can you send me diagrams in detail

    Reply
  83. November 11, 2012 at 12:46 pm

    rahmad arifan

    this my have clap on clap off light.. 🙂 –> http://m.youtube.com/watch?gl=GB&hl=en-GB&client=mv-google&v=o_sb-4zSFp8
    thanks sir..

    Reply
  84. November 13, 2012 at 4:27 pm

    parmesh.A

    in the circuit given will the led remain glowing until one sound is made….if not how to modify the circuit so that the led remains on until one more clap or sound is made

    Reply
  85. November 16, 2012 at 11:05 am

    sharma anish

    hello sir,
    for capacitor 100mf how much volt does it require?
    i used 9volt battery.

    Reply
    1. November 23, 2012 at 4:50 am

      sharma anish

      in clapswitch is that necessary to give 6v battery. is that work fine in 9v battery.

      Reply
      1. November 25, 2012 at 1:13 pm

        Sagar Sapkota

        works with 9V also.

        Reply
  86. November 20, 2012 at 3:54 pm

    Harman punn

    What is the voltage of 100microFarad capacitor?…. Can 25V be used?

    Reply
    1. November 25, 2012 at 1:13 pm

      Sagar Sapkota

      yes. 25V can be used.

      Reply
  87. November 21, 2012 at 4:34 am

    Vii

    I did it but the light stays on for a few seconds then it goes off, i unplugged the mic and the it acts the same way. What did I do wrong? the only change I did was using a 47 Kohm 1/2 w resistor.

    Can you help me?

    Reply
  88. November 29, 2012 at 4:24 am

    Imran Khan

    What is the minimum value of input voltage?
    can we use 1.5 volt or 3 volt voltage in input?

    Reply
  89. December 18, 2012 at 6:39 pm

    John

    Hi, I tried this circuit and it works fine, but the led glows just one time and I have to disconect the circuit and connect it again in order to work again. Do you know why the led glows just one time?
    Thanks!

    Reply
    1. December 27, 2012 at 12:12 pm

      Sagar Sapkota

      Please get the solution on the comments. I have given the answer on the comments. or you can try this project: http://www.buildcircuit.com/clap-switch-using-3-different-modules/

      Reply
  90. January 3, 2013 at 4:28 pm

    Abhinav Moghe

    sir, i am having a query that
    by decreasing the R1 n increasing C1 .. can i make the glow time longer ??

    Reply
    1. January 3, 2013 at 4:31 pm

      Abhinav Moghe

      right now its glowing for 1 sec only ..

      Reply
  91. February 6, 2013 at 9:28 am

    suman

    hi
    can you please guide me to build a clap switch circuit that can light multiple LED’s with a single clap.
    please make it soon coz i have a project the coming week
    thanks

    Reply
    1. March 4, 2013 at 11:50 pm

      Arunava Das

      just add more LEDs in parallel

      Reply
  92. March 6, 2013 at 10:01 pm

    Abhishek kumar

    sir , i want to make a modem (data card) signal booster to increase the signal of modem and increasing the internet speed. so sir please send me circuit diagram or the brade board diagram.

    Reply
  93. March 14, 2013 at 4:25 am

    sherwinjanc

    sir? what mic i will use? electret mic? what resistor is 470r? is that 470 ohms?
    i will make clap switch glowing 220 bulb sir.. where did i place the fuse holder?

    Reply
    1. March 14, 2013 at 7:31 am

      Sagar Sapkota

      470 R means 470 Ohm. You have to use small electret microphone.

      Reply
      1. March 15, 2013 at 2:47 pm

        sherwinjanc

        thanks sir…

        Reply
      2. March 19, 2013 at 11:07 am

        sherwinjanc

        sir upload a picture for pcb layout for that 220 clapswitch

        Reply
  94. March 20, 2013 at 2:10 pm

    sherwinjanc

    i have another question sir if i will clap once it will on? then if i will clap again it will turn off?

    Reply
  95. March 21, 2013 at 2:20 am

    sherwinjanc

    sir how to put the relay?

    Reply
  96. April 1, 2013 at 8:55 am

    John C Sunil

    Sir can I use a bc548 instead of bc547 ? Please reply fast sir and thanks in advance.

    Reply
    1. April 1, 2013 at 9:20 am

      Sagar Sapkota

      YES, YES, YES, You can use. Please check the datasheet of BC547. BC547 is equivalent to BC548.

      Reply
      1. April 8, 2013 at 10:53 am

        varinder garg

        sir we assemble a Clap switch
        Posted by: Sagar Sapkota on 18 December, 2010in Basic Electronics, LDR Engineering, MINI Breadboard150 Comments
        but already bulb glow without claping and no operate.ist we asseble on brend board than no working after than we assemble on PCB than no response.pl solve our probleb.

        Reply
        1. June 16, 2013 at 5:39 pm

          tulsikesh

          i have same problem, in the video there is written 4700ohm resistor but in circuit diagram there is written 470ohm ,i am confuse, tomarrow is my last date to submit the project but my circuit is not working

          Reply
  97. May 1, 2013 at 8:51 am

    saqib

    sir what will be the voltage at the end to the LED??

    Reply
  98. May 1, 2013 at 8:55 am

    saqib

    sir can i use 12v battery in the circuit?

    Reply
  99. May 26, 2013 at 2:06 pm

    Mehmood Masood

    what capacitance is 100N? please reply ASAP

    Reply
    1. June 5, 2013 at 7:00 pm

      anoop

      it is simply 100nf or 0.1nf

      Reply
      1. June 9, 2013 at 8:10 am

        Sagar Sapkota

        100nF=0.1uF and the code is 104

        Reply
  100. May 29, 2013 at 10:08 am

    akash bhatia

    sir I want to learn how rto make sensors completely sir plz help me

    Reply
  101. June 27, 2013 at 9:07 am

    Jervin

    Hello.. Can be used in 5v?? Because I’ll be powering this using USB 5vdc..
    Thanks for your reply..

    Reply
  102. June 27, 2013 at 9:08 am

    Jervin

    This can used using 5v source? Because im planing to power this using USB 5vdc… Thank you in advance.. 🙂

    Reply
  103. July 9, 2013 at 7:46 am

    Chyavan Phadke

    Super Project….. Iam having two confusion,
    1. Can I use 9 volt Battery Insted Of 6v Directly? or any components should be changed ?
    2. How to increase the gain of mic ?

    PLZ REPLY FAST PLZ……..Plz……

    Reply
    1. July 9, 2013 at 7:31 pm

      Sagar Sapkota

      Yes, you can use 9V

      Reply
  104. July 19, 2013 at 6:25 pm

    Shihabudheen

    Really good ….

    Reply
  105. July 31, 2013 at 8:39 pm

    mayor

    sir,how do i network the variable resistor into the circuit in order to make the sensitivity adjustable.. please anyone with useful information should please reply.. i”m working on this as a project. its so urgent

    Reply
  106. July 31, 2013 at 8:48 pm

    mayor

    hello sir,please how do i network a variable resistor in the circuit provided i want to make the sensitivity an adjustable one. i need a reply urgently,sir.. i”m working on this project as my final year project and it worked but my supervisor asked me to make the device acoustic sensitivity an adjustable one.
    anyone with useful info can please drop it. i will be so appreciative…

    Reply
  107. August 5, 2013 at 11:29 am

    blogspot.co.uk

    This article gives clear idea in favor of the new people of blogging, that truly how
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    Reply
  108. August 6, 2013 at 8:47 am

    Sanjay Verma

    Sir,
    I made this circuit using breadboard and it works fine. But I have a question how can increase its sensitivity since it works when clapped some forcefully…………………Thanks for advance……….

    Reply
  109. August 6, 2013 at 8:48 am

    Sanjay Verma

    Sir,
    I made this circuit using breadboard and it works fine. But I have a question how can increase its sensitivity since it works when clapped some forcefully…………………Thanks in advance……….

    Reply
  110. August 14, 2013 at 7:14 pm

    sahithi vemparala

    heloo sir…can i have a ckt in which an led glows with a clap and also led switches off with another clap?

    Reply
  111. August 20, 2013 at 12:05 pm

    Marvin

    hi sir. can i use a 5volts with this project?

    Reply
  112. August 20, 2013 at 12:08 pm

    Marvin

    hai sir…can i have a circuit that the led switches off with another clap?

    Reply
    1. September 28, 2013 at 9:32 pm

      aswin

      use 555 as bistable vibrator

      Reply
      1. March 6, 2014 at 4:50 pm

        Gerson

        What is the procedure in using a 555 IC as a bistable vibrator. Im only a student. Thanks 🙂

        Reply
  113. September 23, 2013 at 8:28 pm

    chinmay

    I havent get o/p yet, what should I chek?

    Reply
  114. September 28, 2013 at 3:59 pm

    priya soni

    sir pls tell me that in 1st diagram can i use the 9v battery in place of 6v…pls sir reply me fast.

    Reply
    1. November 7, 2013 at 8:33 pm

      SAHIL RAJPUT

      HY PRIYA . YA U USE 9V BT. 🙂

      Reply
    2. November 7, 2013 at 8:33 pm

      SAHIL RAJPUT

      HY PRIYA . YA U USE 9V BT. 🙂

      JAY MATAJI

      Reply
  115. October 3, 2013 at 2:38 pm

    Anuj Saxena

    Hey there.. I m using this circuit of yours of 220V load and it worked but after finishing it i realised than the operating mode of IC 555 is in monostable mode.. From last few days i m trying to convert this circuit in bistable operating mode but having a hard time doing it…. so plsss sent me circuit diagram of IC 555 in bistable mode in this circuit which can control 220v load means with claps i can control both on n off of the circuit….
    Please reply fast i m wasting 20 days trying to convert IC 555 operating mode from monostable to bistable…
    Please help waiting for a reply soon….

    Reply
  116. October 3, 2013 at 2:42 pm

    Anuj Saxena

    Hey there.. I m using this circuit of yours of 220V load and it worked but after finishing it i realised than the operating mode of IC 555 is in monostable mode.. From last few days i m trying to convert this circuit in bistable operating mode but having a hard time doing it…. so plsss sent me circuit diagram of IC 555 in bistable mode in this circuit which can control 220v load means with claps i can control both on n off of the circuit….
    Please reply fast i m wasting 20 days trying to convert IC 555 operating mode from monostable to bistable…
    Please help waiting for a reply soon….

    Reply
    1. November 11, 2013 at 11:32 am

      narayan prasad

      u can use bistable vibrator and can make it own…

      Reply
  117. October 19, 2013 at 5:49 pm

    Vedang Joshi

    Hello, i made this circuit on the breadboard but as some components were not available i had to replace the 100n capacitor with a 10uf capacitor and have got a different type of mic also. After making this i observed that it was not working. So, please let me know some ways in which i can fix the problem.

    Reply
  118. October 24, 2013 at 3:20 pm

    Chyavan Phadke

    1.How to increase the gain of mic ?

    Reply
  119. November 5, 2013 at 2:22 pm

    vishal gupta

    sir you have uploaded 2 videos one is of 4:35 min. & other of 11:03 min. so have you used same components in both the videos, i have also made it but as i connect the battery ,the led keeps on glowing & i have used all that components you have asked for, pls help me sir ,i have to prepare it for class 12 practicle.

    Reply
  120. November 12, 2013 at 11:31 am

    Joy Sengupta

    Hi ! I have a question. May it be made by using ic 36830 ?

    Reply
  121. November 24, 2013 at 9:06 am

    roshan

    what’s the voltage of the 100uF capacitor?

    Reply
  122. November 24, 2013 at 9:13 am

    roshan

    Sir can I use bc548 [2] in it instead of bc547

    Reply
  123. November 25, 2013 at 3:05 pm

    roshan

    what is the voltage of the 100uf

    Reply
  124. January 18, 2014 at 4:48 pm

    samit

    my circuit is not working, i have just used a 10micro farad capacitor instead of 100, and when i short pins 1 and 2 of ic, the led glows for 5 seconds.. so please tell me what to do,..

    Reply
  125. January 20, 2014 at 5:49 pm

    khan

    Sir, i assemble my clap switch it looksgud. When i clap it works but after few seconds it doesnt work
    It doesnt respond at all
    Kindly help me sir.

    Reply
  126. February 21, 2014 at 7:39 am

    sachin

    After a clap the the device will go back to its original low state as per the timing of rc network hence this ckt is only useful for demonstration of a monostable mutlivibrator & not for switching load .Do not make this circuit if you want to switch domestic load

    Reply
  127. March 2, 2014 at 11:35 am

    Zishan

    Sir, Please Upload The P.C.B Design For Clapswitch using 555 ic and dc Power

    Reply
  128. March 10, 2014 at 7:52 pm

    nupur

    my circuit is not working..!! led is just glowing ut not the way it should

    Reply
  129. March 21, 2014 at 4:05 pm

    manoj chandra

    can u pls tell me value of condencer microphone that we have to use in clap switch

    Reply
    1. April 8, 2014 at 4:29 pm

      Sagar Sapkota

      You can use any kind of condensor microphone

      Reply
  130. May 17, 2014 at 9:14 pm

    Meena

    this circuit works only to ON the bulb or any load by clapping, it turns off automatically after given time by RC but if i want to OFF the load by clapping how i should connect the above circuit????
    anyone please help me.

    Reply
  131. May 27, 2014 at 4:29 am

    asaf

    you can send me please the pcb layout of this project?

    Reply
  132. June 8, 2014 at 3:55 am

    mahmoud

    Hwllo, can you please tell me the values of the resistances? The ones used in the video are different than the ones used in the circuit (Hence that in the circuit ones are referred as 470R and not in ohms) I have a due to my project and it’s not working. Please help.

    Reply
  133. June 8, 2014 at 3:56 am

    mahmoud

    What modification shall I do to make it run a dc motor ?

    Reply
    1. November 29, 2014 at 9:21 pm

      Omar

      You can add a bridge rectifier

      Reply
  134. June 15, 2014 at 9:33 am

    data centre consolidation

    Wow, that’s what I was looking for, what a material!
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    Reply
  135. June 15, 2014 at 2:51 pm

    Andy

    I am debugging the circuit. Q2 seems in the ‘on’ state at rest (no clap) because the collector is near ground. No sound appears to change that but when I short the microphone it appears to switch ‘off’ because the collector goes high. But it doesn’t trigger. Pleae help?

    Reply
  136. June 21, 2014 at 6:28 am

    Shahan Shah

    sir i want to built 4 volt sound switch circuit. i made the circuit of 6 volt but i wan the voltage decrease to 4 volt please help me sir

    Reply
  137. June 21, 2014 at 6:29 am

    Shahan Shah

    plzz help me

    Reply
  138. July 11, 2014 at 7:12 pm

    VIVEK XALXO

    hi…… i build the circuit as described, but the circuit is very slow . like after producing sound led glows after 5-6 sec. since i didn’t have 470r resistor so i used 1 k instead. is that is the cause of problem????

    Reply
  139. August 1, 2014 at 7:15 pm

    Samar Abbas

    I have tired and it worked. I wanted to ask how can i convert it into On/Off switch not for turning on for a definite period of time. Kindly tell this. Also i when i connect it with siren circuit(using NE555,10K,100n/104pF,9V and 8 Ohm speaker) when sound is produced after clap it is very low how to get it louder. Please reply soon.

    Reply
  140. September 1, 2014 at 1:33 pm

    sankar

    I have tired and it worked. I wanted to ask how can i convert it into On/Off switch not for turning on for a definite period of time – See more at: http://www.buildcircuit.com/clap-switch2/#sthash.nYl7vtEg.dpuf

    Reply
  141. September 28, 2014 at 4:06 pm

    kishore tanwar

    I have make the circuit on breadboard but it is not working.
    the LED glow only when i give the supply after 3-4 sec it goes OFF.
    plz help me.

    Reply
    1. September 21, 2015 at 9:51 pm

      Arushit Mudgal

      Hey Kishore,

      The circuit is designed to be like this only, as the amplified pulse is controlled by the values of resistor and capacitor as mentioned in the post .

      Thank you

      Reply
  142. February 7, 2015 at 4:06 pm

    Angelo

    Sir I’m wondering… what should I follow? Your schematics? Your pictures? Or the videos?

    I did everything that the video told me. Tried to copy the sample pictures. I’ve been repeating that for the last 2 days now all of them are failed attempts. The LED is either always on or off with a 9v battery.

    My electret microphone is not the same as that in the video and pic, mine has some cotton, is that the problem? I could send you a picture of what’s the result of doing that repeatedly.

    Reply
    1. September 21, 2015 at 9:49 pm

      Arushit Mudgal

      Hey Angelo,

      The mic you are referring should not be a issure, Electret condenser comes in very varieties,
      And taking your observation of LED , it can be suggested that the connections of the circuit are not proper, Moreover it is suggested to use short length of wire with the mic as the resistance of wire can be proved to have a negative impact on your working of circuit

      Reply
  143. April 16, 2016 at 10:10 am

    Vasya

    Hello
    What is the function of the capacitor C3 and resistor R4 in the clap switch circuit to turn on LED?

    Reply

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