Re: Source of ripple in simple PS circuit?

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#2249

From: CJT
Date: Mon, 19 May 2003 20:58

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George R. Gonzalez wrote:

> Wait a minute---- you said there's no hum on the headphones!
> 
> That's a really big clue...

Maybe, but the headphone amp could run off the standby PS.

> 
> If there's no hum on the headphones, then it's unlikely the power amp itself
> is making the hum.
> 
> There may be a ground-loop problem with your speaker wiring.
> 
> Are you sure the speaker wires are all done right--?   i.e. two wires
> running to each speaker, neither one connected intentionally or otherwise to
> ground.
> 
> Also, this may sound silly, but does the hum go away when you turn off the
> amplifier power?  If it doesnt go away, then you have hum pickup in the
> speaker wires most likely.  Move that arc-welder farther away from the
> wires.
> 
> 
> 

That would take a pretty hellacious noise source -- speakers are low 
impedence.

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Subject: Re: Source of ripple in simple PS circuit?
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