This is a circuit which can be used to monitor batteries or other electric equipments current problems.Here that current will be indicated through the sound and through the LED.So you all can check your low volt equipments easily.
Parts:
U1 LM339 Voltage comparator IC
D1 1N5233B Zener Diode
D2 LED
R1, R3 1K 1/4W Resistor
R2 5K Pot
BZ1 Piezo Buzzer
MISC Board, wire, socket for IC
Note
# This circuit can be operated with 9v to 12v
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