I'm trying to add another 555 timer to this circuit board (including another potentiometer) to time another time period. For instance, I want the first system to time a 10 second to 2 minute timer period and the second to do the same. I want to use the same power source, the same Piezzo Buzzer and an 0FF/ON/OFF toggle switch to activate either circuit. Has anyone done this before? I couldn't find anything similar in the forums.
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