Fail to enter the correct combination into this kit before entering the protected location and be prepared for a surprise.  Connect the output to any alarm, such as the 2050 Whooper Alarm kit (not included), and monitor your door, drawer, or other private location.

Components:  7 resistors, capacitor, diode, LED, 2 transistors, SCR, IC, push switch, slide switch, 24 pin header, keypad, ribbon cable, battery snap

Principles taught:  LSI logic, security