Speaker Buzz on Robotron

SteveJ

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I just replaced a switching power supply in my Robotron with the original linear power supply. when I turn on the machine now, there is a 1-2 second "HUMM" from the speaker, which then subsides to a "buzz". all game sounds are normal, but the background buzz bothers me.

This seems to be a new issue -- any ideas?
 
Power supply was just rebuilt. My guess is the filter caps on the sound board. It was being powered off of a switcher before so the sound card was DC fed.

The initial Humm is normal. That is a design flaw of the sound cards.

I just finished fixing a sound card that had the same problem. I just replaced all the large caps and it went away.

ken
 
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