I am a rookie.
But somehow I managed to build an A-75 about 2 years ago and since then I have lived with a buzzing sound, not too annoying with my main speakers but really obnoxious with some single driver boxes I am now toying with.
Question: The buzz is not the traditional hum, but more like what I would suspect is related to either the diodes or voltage doubler circuit in the regulated power supply. Where should I look for the source and/or how can I eliminate (or reduce) the buzz?
Thanks,
But somehow I managed to build an A-75 about 2 years ago and since then I have lived with a buzzing sound, not too annoying with my main speakers but really obnoxious with some single driver boxes I am now toying with.
Question: The buzz is not the traditional hum, but more like what I would suspect is related to either the diodes or voltage doubler circuit in the regulated power supply. Where should I look for the source and/or how can I eliminate (or reduce) the buzz?
Thanks,
Dave:
Did you add the bypass electrolytics to the driver card board? There was some slight oscillations that showed up on a few of these that were eliminated by placing an electrolytic from the + , - power inputs to ground on the driver cards. I think 150 mf, polarized. Keep - pointing to - and + pointing to + . This will mean where they come together at the ground you'll have a - to a + .
Did you add the bypass electrolytics to the driver card board? There was some slight oscillations that showed up on a few of these that were eliminated by placing an electrolytic from the + , - power inputs to ground on the driver cards. I think 150 mf, polarized. Keep - pointing to - and + pointing to + . This will mean where they come together at the ground you'll have a - to a + .
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