Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I need a circuit that when activate from a button it is on for about 30 sec.
I've tried whit a 555 timer but the problem is that it constantly draws a current of 4mA even if it isn't in use.
put a MOSFET in series with your load
put your momentary from the power to gate
add a cap from gate to ground
the momentary will charge the cap & gate turning the MOSFET on
the size of the cap will determine how long the gate stays on,
then the charge leaks away and the circuit turns off
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