I am experiencing a humming noise from my class ab amplifier when I power up this new iraud amp . The iruad amp is powered by a transformer , so I figured that the transformers inductance would stop any noise from transfering through the primaries ? This humming happens even with no line level input connection to the iraud amp . Both amps work fine if left to themselves.... Iraud is not in an enclosure yet . Also , when I shut the power to the Iraud off , the amp takes a second or two to power down , during this time no more hum from class ab amp .Please help , THANK YOU . P.S. no rfi/emi filtering on primary of iruad power transformer . Hum sounds like 60 hz .
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You answered your own questions probably/partly. First encase it in a metal casing, then please report back.
I ordered a emi/rfi filter an have a old ac to dc power converter that i was planning to use for another amp build (3255) , guess I'll put the iraud in there until I can find another suitable case.... I suppose the case should encapsulate all six sides , huh ? This power converter case does have slot type venting , is that going to be an issue ? I appreciate your help .
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Placed amp in steel case and interference didn't cease .... Hooked up emi filter and amps work fine together now . I am happy . Thanks for your help