13 Comments

  1. March 10, 2013 at 2:33 am

    Christian

    Hey!

    What kinde of relay are you using?

    Reply
    1. March 10, 2013 at 8:42 am

      Sagar Sapkota

      SPDT type of 5V relay.

      Reply
  2. March 10, 2013 at 9:38 pm

    Christian

    Hey again!

    What about the 555timer? I am building the relay project my self, but I need to order parts:S Is the 555timer a NE555P? Does it need to be in operating Mode: bistable mode? Will this timer work http://www.ti.com/lit/ds/symlink/sa555.pdf ?

    thanks for answering!

    Reply
  3. March 4, 2014 at 5:56 am

    Pankaj

    I’m using the very first ckt. I’ve connected (1st) relay as a On-Off switch which is being excited thru external signal & instead of LED with 330R (as shown), I’ve connected one more (2nd) relay. This circuit switches the second relay perfectly on the power ON-OFF cycle of first realy. But on the Power ON-OFF cycle of whole circuit, ckt switches the second relay once. What could be the possible root cause for this problem. I’ve added protection diode on the first relay only.

    Reply
  4. March 4, 2014 at 5:57 am

    Pankaj

    I’m using the very first ckt. I’ve connected (1st) relay as a On-Off switch which is being excited thru external signal & instead of LED with 330R (as shown), I’ve connected one more (2nd) relay. This circuit switches the second relay perfectly on the power ON-OFF cycle of first relay. But on the Power ON-OFF cycle of whole circuit, ckt switches the second relay once. What could be the possible root cause for this problem. I’ve added protection diode on the first relay only.

    Reply
  5. March 7, 2014 at 5:18 am

    Pankaj

    Hi,
    I’d like to drive one more relay instead of LED. I’ve tried it by connecting 2N2222 with 100 ohm in series in place of LED/470 ohm resi. and it did work but the problem is that when I hold switch more than 1-2 sec the relay gets OFF.

    Reply
  6. June 16, 2014 at 5:40 am

    anto

    it is very nice……..

    Reply
  7. August 4, 2014 at 7:23 pm

    Marlon Martins

    hi, is there a way to change the switch with a 5v input? like, momentary 5v in activates the output. momentary 5v again, it disables the output?

    Reply
    1. July 18, 2015 at 2:48 pm

      Tim

      just put a bc547b transistor between then it will work

      Reply
  8. November 18, 2014 at 7:49 am

    varma

    hi all,can u please guide me to built circuit for toggle switch with timing of 5 seconds automatic on/off for any external usage

    Reply
  9. February 19, 2016 at 9:45 am

    sriram

    Hai, I would like to replace the above circuit’s momentary switch with another circuits’s output pin. Could you tell me how to do that?

    Reply
  10. July 3, 2016 at 1:31 pm

    Savas AYDIN

    hi im trying to do a delay for 3 seconds before latching as mobile phone. i cant make anything 🙁 i need press and hold 3 second before start and stop the circuit is there any way to do that 555 ? Thanks

    Reply
  11. September 7, 2016 at 8:14 am

    Aniruddha

    Hi all, can you please suggest me how to build a circuit that switch on and off a load in every 1 hour continuously.

    Reply

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