John smith 2 Posted March 15, 2020 Report Share Posted March 15, 2020 Please .. how can I add buzzer ? Please the schematic and code THANK YOU VERY MUCH Quote Link to comment Share on other sites More sharing options...
HarryA Posted March 16, 2020 Report Share Posted March 16, 2020 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? Quote Link to comment Share on other sites More sharing options...
Mehmet mısırlı Posted January 18, 2022 Report Share Posted January 18, 2022 hello millet. Quote Link to comment Share on other sites More sharing options...
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