Bargrapk car voltmeter

  
The LM39X4 acts as a LED-driving vol-tometer that has its basic maximum and minimum readings determined by the values of R2 and RV2. When correctly adjusted, the unit actually covers the 2 volt to 3 volt range, but it is made to read a supply voltage span of 10-10 volts to 15 volts by interposing potential divider R1-RV1 between the supply line and the pin-5 input terminal of the IC. The IC is configured to give a `dot` display, in which only one of the ten LEDs is illuminated at any given time
Bargrapk car voltmeter - schematic

If the supply voltage is below 10,5 volts none ofthe LEDs illuminate. If the supply equals or exceeds 15 volts, LED 10 illuminates.




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