LED Voltmeter for Cars

Posted on Jan 10, 2013

The circuit, is a comparator, can measure with step of 1Volt, the voltage of battery of car. The clue of voltage become after comparison of voltage of battery, that is applied in the inverting inputs of amplifiers, with voltages of reference that are produced by a Zener D1, the value of which is such so that it present good thermic stability. With the RV1, we regulate the gradation of voltage that we want. The optical clue become from four Led.

LED Voltmeter for Cars
Click here to download the full size of the above Circuit.

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

Leave Comment

characters left:

New Circuits



Popular Circuits

Tape recorder interface
Telephone blinker
How to make a Simple Infra Red Remote Control Circuit
Audio noise filter circuits
Pulse Reading Logic Probe
PCI-Bus with 3.3V Auxiliary Hot Swap Controller
Harnessing Solar Power with Smart Power-Conversion Techniques
A resistor-capacitor circuit protection thyristor