[sdiy] Op Amp AC Coupling/DC Biasing (was Blocking audio at power off)

[Justin Owen]

-----Original Message-----
From: Florian Teply [usenet at teply.info]
Received: 11.09.2008 13:57:50
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Op Amp AC Coupling/DC Biasing (was Blocking audio at power	off)

On Thursday 11 September 2008 15:30:52 Justin Owen wrote:
>>I'm trying to nail the fact that audio is travelling from an input through
>> to an output when there is no power in the circuit.

<snip>

>I seem to have some sort of idea of what could possibly happen there (the 
>circuit acting as some sort of voltage divider when not powered), but that 
>would be a lot easier to verify and explain with at least a very basic  
>schematic to point to.

I was just about to upload a schematic - then we had a blackout. Hmmm...

http://www.sdiy.org/juz/SDIY_troubleshoot.pdf

This is just the initial op amp inverting summer/mixer - first things first I guess.

Thanks all

Justin