Low Voltage Alarm


Parts List-
R1, R3 - 2 - 1K 1/4W Resistor
R2 - 1 - 5K Pot
U1 - 1 - LM339 Op Amp 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.

1 comments:

How do I make this work at 16 V ?

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