Friday, April 12, 2013

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Simple Car Battery Voltage Monitor Circuit

This circuit is used to monitor the battery voltage to show a twin-colored LED standing of the battery to. If the LED “green”battery voltage exceeds eleven.9 volts. If the yellow LED, battery voltage 11.9 to 11.5 volts. If the LED is “red” If the battery voltage beneath 11.5 volts. You can after all trade the set off factors with the support of the trimmer resistors and / or altering the value of the resistors in the divider.


A dual op amp is used as a comparator. The inexperienced LED on the board, except the voltage exceeds 11.5 volts. The crimson LED illuminates when the voltage falls below eleven.9 volts to the circuit. Therefore, in the 11.9 to 11.5 volts, both LEDs are on, producing a relatively yellow colour. When the voltage falls below 11.5 V, the inexperienced LED, and now only the purple LED flashes to point low voltage.

Electronic Parts List
R1=1K2
R2-3-4=680R
R5=15K
R6=10K
R7-8-9-10=1K
IC1=LM324
D1=5V6 /0.5W Zener
D2-3-4-5=LED
RV1=10K trimmer

Is really helpful that multi-shaper for V1 and V2. Muti-trimmer makes it a lot more straightforward to trigger points to make as a inexpensive single-turn trimmer. The trimmer can be totally eradicated when you have get right of entry to to a range of 1% resistors and has had calculated carefully. You would additionally need to present more correct reference voltage as the widespread 78L05 regulator.


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