A simple comparator circuit should do the trick using and LM393 dual or LM339 quad. I believe they also come in single SOT23 packages, but I don't know the part number.i need help making a circuit that lights up two red LEDs when the voltage supplied goes below 2 volts for brake lights on my rc car thanks
if you know anywhere where i can find an y circuit diagrams like this please help me!!!
I designed it for two red LEDs, running at 10 milliamps. I have fixed the schematic (see my earlier post). The LEDs come on when the input voltage goes below 2 volts, and they go off when the voltage goes above 2.2 volts.thanks, what voltage led do i need to use for it because as i have ranted on about in previous posts it needs to work almost like a relay as i know you probably cant get 0.01v led
In my last post, I wrotewhat is the minimum voltage that the light will light up at .eg 0.1v thanks for all you've done ill send you a vid of the lights working when i have it done just incase you want to know what is will be doing it http://www.youtube.com/watch?v=XLTmuPVp9e0&eurl=http://myspace.com/vanepico
Doesn't that answer your question?The LEDs come on when the input voltage goes below 2 volts, and they go off when the voltage goes above 2.2 volts.
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by Jeff Child