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This is an exceedingly helpful link! Thank you very much, I shall peruse it when I get a minute to see what I can uncover.
As for JFETs I typically buy off of eBay and they usually have almost any kind of electronic component for cheap. They have 10 2N3820's for $5. But you're right, they...
This looks promising! I will look and see if I can get the timings I want from it. Could I just throw in a tie-down resistor from the supply to ground? Maybe I can use a transistor or something (P-Channel J-FET?) to tie the input to ground when power is lost...
EDIT: I'm going on the idea right...
Thanks for the help, but this isn't what I need. I will need a time somewhere between 100 and 300ms and the person building it will decide that for themselves, but the circuit can't take more than 50ms or so to reset (at very most).
Is there maybe a way to make the 555 timer start with a low...
That is why I'm using the 555 timer. This will be part of a brake light system on a car, and I need the circuit to reset within a few dozen milliseconds of losing power. When you hit the brakes, the circuit will cause a brief delay (but very specific, I need to time it accurate to 20ms or so)...
I'm building a circuit and this is the basics of it:
After a brief delay after power-up, a latch goes from low to high and stays high until power-down.
On a more technical level:
A 555 timer starts at power up. I feed its output into the NOT-R of a NOT-SR latch. I'll attach the circuit below...
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