Hi, I am charging a 5.7V supercapacitor with a solar panel. I want to cut the power when the cap's voltage reaches 2.5V.
I detect the voltage with a comparator and a 2.5V reference, this turns on a transistor which then switches off a relay.
My problem is that the relay won't stay off. The millisecond the cap's voltage drops below 2.5V, the comparator goes low and the relay gets back on. So I end up with a buzzer
I know this is expected behaviour, what I need is a way to extend the circuit to keep the relay switched off.
My schematic is attached.
Thanks
I detect the voltage with a comparator and a 2.5V reference, this turns on a transistor which then switches off a relay.
My problem is that the relay won't stay off. The millisecond the cap's voltage drops below 2.5V, the comparator goes low and the relay gets back on. So I end up with a buzzer
I know this is expected behaviour, what I need is a way to extend the circuit to keep the relay switched off.
My schematic is attached.
Thanks
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