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Hello. I received some 2 boards from some kind of old battery charger. I don't know are there any other boards that should be related to it. I drawed some kind of schematics, maybe i made some minor mistakes ... Should this be some kind of comparator when switcher the charging on and off? When i measure voltage on 741 on pin 3 is always ground, and pin 2 varies with input voltage. The same thing on both boards. When I connect it to supply, whatever voltage I give from 20-35V it is always the same result. First relay closes immediately, and second after few seconds. Can anybody figure out what this actually does and how is related to some kind of 24V charging system? And explain maybe?