Another problem inspired from the same four-wheeled wreck.

I want to receive a standard time-length pulse wave of 12 volts (less is good too) when I input a voltage level. That means, when I raise the input from 0 to 1, I expect at the exit one, and only one, pulse of standard duration.

I thought of a 555 monostable but the output doesn't fall unless the input falls to zero.

I want the project as small as possible.

Thanks in advance!

 

The attached circuit will trigger on the leading edge of the input signal, and will time out even if the input remains high. Does this fit your needs?

Ken

 

Actually, I have only 0.5 Volt, not enough to turn on the transistor, but I can work around that.

Thanks a bunch!

 

Ahhh! Details...details...details.

Ken

 

Actually, I have only 0.5 Volt, not enough to turn on the transistor, but I can work around that.

Thanks a bunch!

You could use the biasing method I talked about on the last thread. (Remember the resistors should probably go up to Vcc and down to ground, not to collector and emitter.) A comparator could also work.

 

Yeah, the comparator is what I had in mind.