Mains hum problem

yash gupta said:

thanks.

Here's my pcb art work
**broken link removed**

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yash gupta said:

and putting a sheet of foil, insulated by cardboard under the pcb.

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mvs sarma said:

once power supply is conditioned with the caps i suggested
no need perhaps for all those shielding

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yash gupta said:

Thankyou very much for your help Hero.
The noise has already got low many times by using shielded cables and putting a sheet of foil, insulated by cardboard under the pcb.
The next time I make a pcb, I will surely consider your advices.

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mvs sarma said:

Mr Gupta,
please put 0.01uF disc capacitors, one across each diode in the bridge rectifier circuit and the hum would disappear. All the best.

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