Thanks Florian for the links, that's basically what I had in mind.

It would be nice if it could work with both audio and CV and maybe with
centred pots with positive and negative swing.

I find many occasions when I want to send a signal to multiple
destinations but with the desire to attenuate on or two of the signals.

Looks like a project for the new year.

The matrix mixer would be great as I could then use it for combining
various CV's to make more versatile modulation sources.

Thanks again

David

David Salter
Senior Project Manager
Reuters Ltd
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________________________________

From: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
On Behalf Of Florian Anwander
Sent: 13 December 2005 16:39
To: Doepfer_a100@yahoogroups.com
Subject: Re: 1 A bit of help needed


Hi David

> At it's simplest it's 1 input feeding 4 outputs with level controls.
> Anyone have a simple schematic or suggestions

Basically you are looking for something like a simple mixerchannel with
4 aux sends. Right

Do you want it for audio or for CV Should it have the possibility of
send inverted or not


In principle you do not need anything else than a frontplate, four
47k-pots (log for audio/lin for CV) plus knobs four 100k-resistors and
five sockets.
Connect the input socket to the "upper end" solder pin of all pots.
Connect the "lower end" solder pin of all pots with ground.
Connect the center pin of each pot via a 100k-resistor to one output
socket.

So far so easy.

The trouble starts, when you want to mix several of such distributed
signals in one source (like the Aux-Send-Master in a audiomixer). This
requires a buffer amp. To avoid this you have to add a buffer-amp to the

each output.
Example: http://www.doepfer.de/DIY/amp_noninv.gif

Check out http://www.doepfer.de/DIY/a100_diy.htm and look for the matrix

mixer. Your distribution-module like a matrix mixer, but there is only
one row of the input section as seen in the
http://www.doepfer.de/DIY/matrix_mixer.gif



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