A little light project

Thread Starter

sikter

Joined Jan 25, 2012
23
I would like to make a circuit which consists of:
-one light bulb (or LED)
-one momentary switch,
-power supply ( anything from 1,5 to 12V DC)
-anything else I need to do following

When I push my momentary switch the light would go ON.
Next time I push it, the light would go OFF.

thanks
 

R!f@@

Joined Apr 2, 2009
9,728
Momentary has only one state.

U need a single throw or a push button switch.

So what else do you need to complete ur light project, a diagram ?
 

Thread Starter

sikter

Joined Jan 25, 2012
23
Momentary has only one state.

U need a single throw or a push button switch.

So what else do you need to complete ur light project, a diagram ?
Yes, maybe diagram with explanation...
(But remember this project doesn't include a latching switch)
 

Wendy

Joined Mar 24, 2008
22,138
I suspect something like the circuit I showed is used for a lot of applications. It used a momentary contact switch, and is fairly simple.

I also suspect we won't hear from the OP again. Time will tell.
 

Thread Starter

sikter

Joined Jan 25, 2012
23
I suspect something like the circuit I showed is used for a lot of applications. It used a momentary contact switch, and is fairly simple.

I also suspect we won't hear from the OP again. Time will tell.
I just want to thank you again!
Your links really helped me a lot! That was
what I was looking for. Still reading the other stuff.
Sikter
 

Wendy

Joined Mar 24, 2008
22,138
Naw, but I would like feedback when you are finished. It is too easy to make assumptions when you've done it for decades, it doesn't hurt to get fresh input now and again.
 

Wendy

Joined Mar 24, 2008
22,138
Forget what he said, look at what he did. This was a simple push button circuit. The LED lights when he pushed the button, goes dark when the button is released. Very basic circuit.

It is +5VDC, resistor, LED, button. Extremely simple.

He is using a laptop USB for 5VDC.
 

Thread Starter

sikter

Joined Jan 25, 2012
23
Ok I see,
Waste of time, actually.
I saw a lot of videos what includes relays (which I really want to avoid)
555s seam to be most simple solutions.

Many people have mentioned a flip-flop solution but I couldn't find out how they worked.
Would you mind?
 

Wendy

Joined Mar 24, 2008
22,138
Did you notice the theory of operation on the bottom link article? If there are part of it that are not clear please ask the specifics.

This is not your normal flip flop. Matter of fact, it is extremely round about, using the dead space between the hysteretic gates set points. It is unusual to say the least, but it works.

Most flip flops use inverting gates of some sort, that is more the norm.
 

Wendy

Joined Mar 24, 2008
22,138
It looks like it would work.

Side note, you were looking at a buck puck lighting the LED. These devices are not pololu switches, which is the simple toggle similar to the 555 circuit I showed.

Google buck puck. They are neat devices. If you have a 9V battery (say, 3X LM1131 celles) and the LED needs 3.6V at 700ma the 9V source will provide 290ma. This is because they are converters. They are also not cheap, nor is the power LED (3W).
 
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