Help with latching circuit

Discussion in 'The Projects Forum' started by xile6, Jun 11, 2011.

  1. xile6

    Thread Starter New Member

    Jun 9, 2011
    10
    0
    Hi i am trying to make a latching circuit. Something simple would be nice.
    All i need to do is make an on off circuit with one button.
    Push once it outputs power. Push again and it turns off power.

    I found some diagrams that use 4-5relays but i am trying to get around that.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    What are you trying to latch? Voltage and current are always nice to know. There are also alternate action pushbutton switches that will do the same thing - push on, push off.
     
  3. xile6

    Thread Starter New Member

    Jun 9, 2011
    10
    0
    it will be used for a car. So 12v power. I want to latch and unlatch a relay with only using one button.

    I found this link :
    http://www.electronics-lab.com/projects/misc/012/index.html

    Which is what i want but it is running off of 5v, im just having a little problem warping my head around it. I made it on a circuit building program i have. It worked but then gave me an error.
     
  4. #12

    Expert

    Nov 30, 2010
    16,343
    6,827
    You can adapt that circuit to 12 volts or buy a single coil latching relay.
     
  5. xile6

    Thread Starter New Member

    Jun 9, 2011
    10
    0
    yea i finally got it working in my program. I believe i had a ground that wasnt hooked up and i couldn't see due to wires over laping.
    My only thing is how well and how long can this keep a latch without failing
     
  6. #12

    Expert

    Nov 30, 2010
    16,343
    6,827
    Your circuit will probably fail when the electrolytic capacitor or the LED dies. First guess...about 100,000 hours, give or take 30%. If you drive the car longer than that, you should probably pull over and take a nap. :)
     
  7. xile6

    Thread Starter New Member

    Jun 9, 2011
    10
    0
    Ok did the math and that's about 11years. Always on. So that's good.
    I plan on using it to turn on and off a few things n the car. Didn't want to use a toggle switch because of have everything is se up in the rest of the circuit.
    I'm going to try to build that circuit I posted up there and add it to what I already have and see if it will work for me.
     
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