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I have very basic knowledge of electronics.

I am looking for a circuit which can turn ON/OFF an LED from a single switch.

  • If the LED is OFF and the switch is pressed (even if not released) then the LED should turn ON.

  • If the LED is ON and the switch is pressed (even if not released) then the LED should turn OFF.

A switch can be a push to ON switch but turns OFF when released. It is not like a toggle switch.

Thanks in advance

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  • \$\begingroup\$ What parts are available to you? Would a D-Flip Flop work? \$\endgroup\$
    – Tyler
    Oct 21, 2015 at 2:29
  • \$\begingroup\$ Hi Tyler, I have 555 timer IC but can get other items as well. Just need a really simple solution to achieve this. \$\endgroup\$
    – Amit Kumar
    Oct 21, 2015 at 2:34
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    \$\begingroup\$ Your solution is right here. It's called a "Soft Latching" power switch. Check it out \$\endgroup\$
    – ezra_vdj
    Oct 21, 2015 at 4:12
  • \$\begingroup\$ @ezra_vdj If the button is not released then the circuit will oscillate; the LED will flash. \$\endgroup\$ Oct 21, 2015 at 11:35
  • \$\begingroup\$ @CharlieHanson If it's good enough for Dave Jones I'd say it's good enough. All depends on project, cost, who's using it etc though, you feel? \$\endgroup\$
    – ezra_vdj
    Oct 21, 2015 at 11:41

1 Answer 1

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This one is fairly simple: -

enter image description here

Each time you press the button, the output latches in the opposite sense to what it previously was. Lots of good ideas.

Picture stolen from this stack exchange question: Make a Latching Relay using SPDT Relays

Is this question all but identical?

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  • \$\begingroup\$ Thanks Andy. The circuit looks OK but will not fit my project as I have to manage multiple LEDs. May be 10 or something. Do you have any suggestion? \$\endgroup\$
    – Amit Kumar
    Oct 21, 2015 at 23:34
  • \$\begingroup\$ Here is my exact requirement. electronics.stackexchange.com/questions/196598/… \$\endgroup\$
    – Amit Kumar
    Oct 22, 2015 at 0:09
  • \$\begingroup\$ I have answered this question for a single channel. Just step and repeat for multiple channels. I don't see the problem unless, of course, you have changed your mind about what you want. \$\endgroup\$
    – Andy aka
    Oct 22, 2015 at 9:21
  • \$\begingroup\$ I haven't changed my mind. I was looking for a circuit with less number of components. However, your answer seems to be more accurate than others. Thanks for your help. \$\endgroup\$
    – Amit Kumar
    Oct 22, 2015 at 23:26

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