3 LED Car battery Indicator

Posted on Sep 12, 2012

The operating principle of the circuit is very simple. The first Led D1 is placed in series with the resistor R2 and diode D4.An only be lit this LED indicates that the battery is ypofortismeni. For this reason Led D1 is red. If the voltage is greater than 12V, then netting R5 Z3 turns the transistor TR1, so the glows and Led D2 indicates that the battery of your car is okay and that is why color is green. Now, if the battery voltage exceeds 13,5 V in the same way it lights up and the third LED D3 in the middle of the transistor TR2.Stin cases this increase in voltage is detected by the panel R3 Z1 Z2.Afto means that your battery is yperfortismeni.

3 LED Car battery Indicator
Click here to download the full size of the above Circuit.

Specifications: Operating voltage: 9 - 14V DC operation: 40 mA Green LED: battery voltage 12 - 13,8 V Red LED: over voltage 13,8 V Amber LED: voltage below 12V

Leave Comment

characters left:

New Circuits



Popular Circuits

3 channel audio mixer (2N3904)
cto frequency converter
Low Battery Cut off and Overload Protection Circuit
the design of the radar for back running vehicle of MSP430
TX-300 300mW FM Transmitter
digital logic purpose of diode in this 555 timer application
drawing Any idea which software was used to generate these circuit diagrams
555 Timer Frequency and Duty Cycle Calculator
digital alarm clock using pic
UPB1009K Necs Low Power Gps Rf Receiver Bipolar Analog Integrated Circuit
Pressure sensor circuit
Remote tracking circuit schematics
Using reactors buck breeze block circuit