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John smith 2


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Can you connect a 240v buzzer to the relay and get what you need? I don't know the circuit so I can not help much. Perhaps someone more knowledgeable will come along. I would think that the lead from the mains/transformer to the relay would be from the lead that has the fuse and power switch on it.

The URL is here: https://www.electronics-lab.com/project/darkroom-timer-v2-0a-for-pcb-exposure-box/

What does this circuit do that a 60 minute egg timer could not do?

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