News:

Hi!

Welcome to my DIY audio forum.

Cheers
Per-Anders Sjöström

Main Menu

QRV08 - Humming sound from transformers

Started by mabu0815, February 04, 2016, 11:12:01 AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

mabu0815

Hi PA,

I am building the QRV08 and have completed the power supply and regulators now.
All 4 leds light up and the voltages are around 13.8 volts.

So far, so good, but I hear a faint humming sound (I suppose) from the transformers.
It's audible from ca. 50 cm distance from the board.

Have you experienced that before?

The parts I used are the ones from the BOM ordered at distrelec.
The only part that differs is the AD825 which I replaced by AD820 (the AD825 was not available anymore).

After powered up for 1 minute, no part of the circuit gets unusually hot.

Do you have some other expected voltages at certain parts in the regulator circuit I can measure?

Thanks for your help

mabu

peranders

Also potted transformers can hum. I have experienced that.
/Per-Anders Sjöström, owner of this forum

Homepage with my DIY hifi stuff