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.

 

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.

 

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.

 

You can adapt that circuit to 12 volts or buy a single coil latching relay.

 

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

 

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.

 

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.