i need some help with a 741 op amp.
Posted: Fri Aug 04, 2017 12:42 pm
i have been playing with these for sometime now, mainly for light / dark relays for solar lights i build.
i was having a issue with relay chatter right as it got dark, but i fixed that with a resistor ( hysteresis control )
but i am looking to add a bit more to it,, i am looking for a way to add in some delay, so that if it a passing cloud or such does not trigger it to come on, then back off right away..or any other shadow, have had a few times just before dark and a passing cloud would make light come on, then go back off after a few seconds..
any ideas? i'd like something to give me about 15 to 30 seconds delay before transitions.. is this something that can me added to the 741 circuit or will this require another separate circuit ?
this is all 12vdc operated circuit, the circuit drives a relay.
i was having a issue with relay chatter right as it got dark, but i fixed that with a resistor ( hysteresis control )
but i am looking to add a bit more to it,, i am looking for a way to add in some delay, so that if it a passing cloud or such does not trigger it to come on, then back off right away..or any other shadow, have had a few times just before dark and a passing cloud would make light come on, then go back off after a few seconds..
any ideas? i'd like something to give me about 15 to 30 seconds delay before transitions.. is this something that can me added to the 741 circuit or will this require another separate circuit ?
this is all 12vdc operated circuit, the circuit drives a relay.