I want to know if it's possible to have a push button so that when it's activated, it turns on my 9 volts circuit for 10 minutes and then turn it off. Also, I don't want this circuit to consume electricity when it is close.
Thanks you
555delaytimer
I want to know if it's possible to have a push button so that when it's activated, it turns on my 9 volts circuit for 10 minutes and then turn it off. Also, I don't want this circuit to consume electricity when it is close.
Thanks you
Best Answer
If you use a P-channel MOSFET to switch power, and use a button to turn on a timer, which, when done, releases the gate of the P-channel (pull it up to power-in with a resistor,) you will have a circuit that draws no current when off (well, maybe a microamp or two.)
I'd solve this by a small MCU like an ATTINY-85, but it could likely also be done with a 555 in one-shot mode.
simulate this circuit – Schematic created using CircuitLab
For a small-current circuit, a cheaper P-channel MOSFET than the SUP75P03 can be used -- something like a BS250 might even be sufficient if current draw is < 100 mA or so.