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Check out the video below for a tutorial on how to build this project.
When you build the circuit do not put R3 resistor in untill last, Start with a high value (around 100k) then power up the circuit with between 6 and 12 volts. with the trap open so the alarm would go off start trying smaller value resistors untill the alarm goes off.
Dont forget to check out my video on how to bait a mouse trap to get the mouse 99% of the time.