HUM IN SB-303

[Dave Edwards]

Power supply!
You kinda need a scope and the schematic.
Look at the DC voltages that the power supply generates, and see how much AC
ripple is on there. If there is none, well...now you have a problem. Start
at the audio amp and work back in.
That is my idea anyway.
Regards....Dave
----- Original Message -----
From: "George Yazzolino" <Kc7hkp at TELEPORT.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, January 14, 2002 9:31 PM
Subject: HUM IN SB-303


> HELLO ALL.
>
>                               I HAVE A SB-303 RECEIVER. AS SOON AS I TURN
IT
> ON IT HAS A VERY LOUD HUM
>
>                              THE ONLY THING I CAN HEAR IS HUM. DO NOT KNOW
> WHERE TO START ON TRYING
>
>                              TO FIND THE PROBLEM. SURE COULD USE SOME HELP
> IN SOLVING THIS. THANKS
>
>                              VERY MUCH,        GEORGE / KC7HKP
>
>
>
>
>
> P. George Yazzolino
> 15200 SE 24 Street
> Vancouver, WA.  98683-8521
> KC7HKP...Grid CN-85
>
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