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Now for the last level set the voltage to 11.9V and adjust VR8 until LED8 goes off.

Change the voltage to 12V and adjust the VR7 this time until LED7 goes off.

Change the voltage to 12.1V and adjust the VR6 until LED 6 goes off.

Decrease the voltage to 12.2V and adjust the VR5 this time until LED5 goes off.

Again change the voltage to 12.3V and adjust the VR4 this time until LED 4 goes off.

Set the voltage to 12.4V in the power supply and adjust the VR3 until LED 3 goes off.

Now set the voltage on the adjustable power supply to 12.5V and Adjust the VR2 slightly until LED2 turns off.

Start adjusting the variable resistor VR1 until LED1 turns off.Now replace the battery with this power supply in the circuit.If you are using a 12V battery then take an adjustable power supply and set its output voltage to 12.6V.This circuit is using 8 LEDs, each of which switches off at the preset voltage levels.īefore using this circuit you need to follow these steps to tune your circuit. All the op-amps are working as a comparator to detect the voltage level preset by a variable resistor of 10K.