Anyone got schematics for a single flashing light?

[Jordanwb]

Does anyone have schematics for a single flashing light. I found one online for two, but it won't work for me. A requirement is no programmable/complicated ICs.

[NovaAesa]

What about simple ICs? Are you allowed to have them? You could use a 74LS74 (JK Flip Flops) and just make a very simple finite state machine.


EDIT: Maybe this approach wouldn't work to well. For this you would need a clock pulse anyway, which I get the impression is what you trying to create.

[aimran]

How bout a flip-flop circuit? Just don't connect the other LED.

[ZylGadis]

What you are looking for is called a multivibrator. You need two transistors, four resistors, two capacitors, and a power source (and the light, of course). Look it up on wikipedia or wherever.

[tamoneya]

I second the multivibrator idea. If you tell us what the frequency or period is that you want we can make it even more complete if you arent able to do out the equations.

[ssam]

555 (http://en.wikipedia.org/wiki/555_timer_IC) chips are quite commonly used for flashing things.

if you want a stable 1Hz source, see http://www.hackaday.com/2007/02/04/cheap-1-hz-clock-source/

[mips]

555 (http://en.wikipedia.org/wiki/555_timer_IC) chips are quite commonly used for flashing things.

if you want a stable 1Hz source, see http://www.hackaday.com/2007/02/04/cheap-1-hz-clock-source/


trip5 (as we called 555ics) was also the first thing that sprang to my mind. If I recall correctly you could change the frequency with a simple pot/varistor.

[Jordanwb]

What you are looking for is called a multivibrator. You need two transistors, four resistors, two capacitors, and a power source (and the light, of course). Look it up on wikipedia or wherever.

I have schematics for that, but that schematic is for two alternating lights. I want a single flashing light that flashes at 1Hz.

[aimran]

Dont use one LED? And set the half cycle to 1Hz :P

[Jordanwb]

I guess that would work. I'm gonna keep looking though.

[Bungo Pony]

Exactly what you wanted:

http://www.geocities.com/SiliconValley/2072/proj2.htm

[Jordanwb]

I'll take a look at that one too.