Car battery condition checker

  
This circuit uses an LED and 4081 CMOS integrated circuit. The variable resistor sets the voltage at which the LED turns on. Set the control so that the LED lights when the voltage from the car`s ignition switch drops below 13 volts
Car battery condition checker - schematic

The LED normally will light every now and then for a short period of time. But, if it stays on for very long, your electrical system is in trouble.



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