Parts List -
R1 - 1 - 1K 1/4 W Resistor
R2 - 1 - 680 Ohm 1/4 W Resistor
D1 - 1 - 1N4001 Silicon Diode
BZ1 - 1 - 12V Buzzer
S1 - 1 - SPST Switch
SCR1 - 1 - C106B1 SCR 106CY
SENSOR - 1 - See Notes
MISC - 1 - Board, Wire, Case, PC Board (For Sensor)
Notes
1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.
2. Make sure to use a loud buzzer.
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