I was reading this thread: https://www.electro-tech-online.com/threads/need-help-with-a-time-delay-cirsuit.121399/
and I had an idea. I did not want to post on his thread, as I have no idea if this works, so I'm asking here in my own thread.
macgyver states:
My idea is to use a resistor, comparator, and capacitor.
Could you wire the button to a resistor, with a capacitor to ground and calculate the time it takes to charge the capacitor for given resistor (choose resistor based on time requirement) and wire the positive side of the capacitor to a comparator. have the comparator with a reference voltage same as supply voltage so that when the capacitor reaches full charge (ref voltage) the comparator will change state and activate a latching relay.
could that work? would it be reliable?
and I had an idea. I did not want to post on his thread, as I have no idea if this works, so I'm asking here in my own thread.
macgyver states:
what i am needing is a time delay that requires you to hold down the switch for say 30 seconds to start another timing circuit that goes for say 10 mins...
My idea is to use a resistor, comparator, and capacitor.
Could you wire the button to a resistor, with a capacitor to ground and calculate the time it takes to charge the capacitor for given resistor (choose resistor based on time requirement) and wire the positive side of the capacitor to a comparator. have the comparator with a reference voltage same as supply voltage so that when the capacitor reaches full charge (ref voltage) the comparator will change state and activate a latching relay.
could that work? would it be reliable?