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echo: audio
to: KEITH KNAPP
from: BONNIE GOODWIN
date: 1997-06-18 10:04:00
subject: Isolation Transformer

Hiya Keith!
-> Basically I just made a 'rail' and tied every ground to it.
-> It's not pretty, but it works.  
Yep, that's basic brute force technique at a board level.
-> BG>Ah yes, Walter Jung is THE MAN as far as Op Amps go. I have
-> BG>  learned much
-> I wish he'd write an "Op amps for dummies" type book.  I didn't know
-> much theory when I read his "Audio IC Op Amp Applications," so I had
-> a hard time figuring out what he was saying.  But that book has more
-> circuits than Carter has pills, and unlike some books, the circuits
-> actually _work_!
->
->
-> BG>Your idea of getting the transformer away from the box was
-> BG> probably your biggest contribution to the low noise of your
-> BG> preamp along with your care in grounding techniques.
->
-> I just made a virtue of necessity -- the transformer wouldn't _fit_
-> in the original box.  Then I remembered that Crown had once made a
-> trick preamp where the PS was in a separate box.  Hmmmm....
->
-> I also built the phono preamp right into the turntable -- them
-> teeny little wires come right out of the arm and into the chip.
-> That and Walter's great phono circuit really surprised me when
-> I first played a record thru it.  Not bad for fifty bucks!
-> At one point I was trying to figure out how to put the op amp
-> right on top of the cartridge on the tone arm, but cooler neurons
-> prevailed.  
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