Parts:
| Part | Total Qty. | Description |
| R1, R3 | 2 | 1K 1/4W Resistor |
| R2 | 1 | 5K Pot |
| U1 | 1 | LM339 Voltage comparator IC |
| D1 | 1 | 1N5233B Zener Diode |
| D2 | 1 | LED |
| BZ1 | 1 | Piezo Buzzer |
| MISC | 1 | Board, wire, socket for IC |
Notes:
1. The circuit will operate from 9V to 12V.
2. Adjust R2 until the alarm goes off at the correct voltage.
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