Low Voltage Alarm
This low voltage circuit can be used to monitor batteries and other volatile sources of current for problems. The circuit sounds an alarm and lights an LED, but can be interfaced to any number of other circuits for many different uses.
Schematic
Parts:
Part | Total Qty. | Description | Substitutions |
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.
Title: Low Voltage Alarm
electronic circuit
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 820
Print version:
Other electronic circuits and schematics from Security and other sensors and detectors
-
Power supply failure alarm
-
Emergency Light & Alarm
-
Infrared Alarm
-
Heating System Thermostat
-
Metal Detector
-
Brakelight Flasher
-
Touch Switch II
-
4 channel Telemetry System
-
Live-line Detector
-
Capacitive Sensor