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Hi Everyone,

thanks for replying. I checked a few things in the circuit.

[ATTACH=full]198565[/ATTACH]

so there are two circuits on two different pcbs.

One circuit provides 9V using 7809 and another circuit which is a voltage divider on a separate zero pcb is connection to the first pcb for the power supply.

What is observed is when I connect the voltage divider circuit to power supply and check the AC voltage on the first PCB(power supply), the voltage varies according to the resistance of POT on voltage divider circuit. When I turn knob of the POT, the AC voltage varies from 4v to 14v

But when I disconnect the voltage divider circuit the AC voltage on power supply remains at around 14v.

I think the POT of the voltage divider is connected to ground pin of the ic 7809 which is causing this voltage variance.

But, I don't know exactly why it is happening.

Please advice.

thanks