16 Comments

  1. April 9, 2012 at 11:21 am

    mandeep

    i used LDR for light detection..is work in night only & only senses torch light only….i required to sense sun light…so what i use in place of LDR…reply

    Reply
  2. June 4, 2012 at 12:54 pm

    Tittu

    Here you can use this Tool to find
    the time out
    The Timeout Of Monostable Multivibrator Calculator

    Reply
  3. July 4, 2012 at 8:24 am

    Pratik Shrestha

    this really does work but the time we set is not constant on every attempt…sometimes it glows for very long time..can u kindly tell me why is that so?

    Reply
  4. August 11, 2012 at 5:49 pm

    Sanjay adhikari

    How touch sensor works?

    Reply
  5. November 26, 2012 at 9:14 am

    taliez

    can i use a PIR sensor instead of an LDR? (Dark sensor using 555(based on Monostable mode))

    Reply
    1. November 27, 2012 at 9:19 am

      Sagar Sapkota

      no

      Reply
  6. April 12, 2013 at 10:20 am

    Hassan

    Can u tell me the voltage rating of 100 micro farad capacitor intouch sensor

    Reply
  7. May 9, 2013 at 11:01 am

    Patrick Chung

    This circuit can be simulated on:

    http://www.cirvirlab.com/simulation/ne555_monostable_multivibrator_online.php

    in order to see waveforms and influence of R and C value as well as time position of triggering signal.

    Reply
  8. May 12, 2013 at 1:17 pm

    aswad

    hello… can you kindly tell me how to convert this dark detector circuit into light detector circuit… which part and components that i need to change?? tq

    Reply
    1. October 31, 2013 at 7:51 pm

      Ajay

      Just interchange the LDR and the variable resistor that is connected in series and trigger input is connected between them.ie interchange the ldr with 100k variable resistor.

      Reply
  9. July 13, 2013 at 11:39 am

    jemt

    i need to let the led lit for 2 seconds
    .plz suggest the r1 and c1

    Reply
  10. August 9, 2013 at 10:23 am

    nanagee

    i want to construct a bulb by using sensor

    Reply
  11. November 24, 2013 at 1:55 pm

    Heena

    What program you are using to draw schematic

    Reply
  12. April 10, 2014 at 3:05 am

    nike air max bw

    Mode of NE555- Monostable | BUILD CIRCUIT
    nike air max bw http://www.elchaletsuizo.es/zapatillas/nike-air-max-bw.html

    Reply
  13. June 4, 2016 at 11:46 am

    PlasticBag

    I want to use 4.8 V light bulb. What do I have to change in the circuit?

    Thanks

    Reply
  14. July 8, 2016 at 8:13 pm

    dhruv

    here i have interfaced the relay parallel to the led and 220 ohm resistance ……..relay gets activated but do not get turned off after taking my finger off…….plzz help

    Reply

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