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'Question for the Audo (analog) Boffins.'
1999\11\22@190742 by Mathew Cohen

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Hi,

I am looking for a "simple as possible" preamp circuit to connect to a VCA
and allow the Audio imput to switch between Mic and Line Level with a gain
pot if possible.

Thanks

Mathew Cohen

1999\11\22@233217 by Mark Willis

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There are always those preamps made with 4000 series CMOS Logic parts?
Pretty simple, but I haven't done one in a long time (You let the
inverters act as an oscillator, they generate a voltage proportional to
your audio signal, anyone have the design handy?  If I were done moving,
...  <G>)

Some of the below may be duplicates mirrored, just quick possibilities
for you:

See also, http://www.ee.washington.edu/eeca/circuits/,
www.ee.washington.edu/eeca/circuits/Micro.GIF,
http://www.ee.washington.edu/eeca/circuits/micamp.html, as well as (also
at ftp.ee.ualberta.ca):
ftp://ftp.unina.it/pub/electronics/cookbook/audio/guitar/preamps.gif,
ftp://ftp.unina.it/pub/electronics/cookbook/audio/guitar/dualpabb.gif,
ftp://ftp.unina.it/pub/electronics/cookbook/audio/guitar/toneccts.gif,
www.ktc.com/personal/artswan/cland/preamp.gif,
http://www.ktc.com/personal/artswan/cland/preamp2.gif,

Also, ftp://ftp.unina.it/pub/electronics/cookbook/video/kuckuck.zip is
about using a DRAM chip as an optical imaging device.  Interesting page
there <G>

 Mark

Mathew Cohen wrote:
{Quote hidden}

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