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Re: My Audio Buddy problem.

Subject: Re: My Audio Buddy problem.
From: Rob Danielson <>
Date: Thu, 26 Aug 2004 10:19:14 -0500
At 2:27 PM +0000 8/26/04, Rich Peet wrote:
>--- In  "Rich Peet" <>
>>  Well that is neat.
>>  >
>>  20Preamps/AudioBuddy_PCBoard.jpg
>>  > Hope you see something interesting, Best, Rob D.
>Looking at the photo more I don't understand why it will not work on
>dc.  You just need to supply the correct polarity at 2.5 volts over
>the output of those regulators.  The 4 digit number on the regulator
>chips will tell you the voltage out of them and just add 2.5 to 5.0
>volts.  I also don't see that it would hurt it to supply the wrong
>polarity other than to make it not work.
>Are you sure you supplied the correct polarity when you tried it on

With which power connection?  For the most recent simple headed test, 
I ran the postive to the center pen of the factory 10VAC connecter at 
the back. I didn't think polarity would matter because it goes 
through a rectifier doesn't it?  Our mod, as below, worked.

>Looks like a simple full wave bridge conversion from ac to dc.
>filtered with just 2 large caps on both the + and - sides. then the
>outputs of that go to the two regulators.

Using Evert's suggestions, Bill tied in +/- 18 volts before the two 
regs. it worked except for the CAD 179 phantom demands-- which was 
the application I had in mind, M-S with NT1A and CAD-170.


Rob Danielson
Film Department
University of Wisconsin-Milwaukee


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