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 Forum index » DIY Hardware and Software
Gutting a PAiA 9402 submixer...ewww
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Freq Band



Joined: Sep 05, 2006
Posts: 53
Location: Los Angeles

PostPosted: Tue Dec 12, 2006 7:21 pm    Post subject: Gutting a PAiA 9402 submixer...ewww
Subject description: putting in better boards
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(see red type below for the meat of this post)

So I bought someone elses' old DIY PAiA submixer.
And it finally wants to 'come out of the closet'.

Looking at the original board and PSU, I think I could make an improved mixer.... done in a week or less.
Without getting too tweaky/crazy, 'cause this aint gonna be no Neve.

Simple, like popping in Ray Wilsons' mixer versions....but keeping most of the PAiA's old pots:
4 dual ganged 100k's (four stereo inputs)
4 single 10k's (two mono sets -volume & pan)... I can change these to fit Ray's schemo.
------------------------
Here are two circuits that I can use in this box, letting me stay true to the PAiA's front pannel....(and allowing ample headroom when all jacks are in use).....

One is for "stereo inputs" :
http://www.musicfromouterspace.com/analogsynth/stereoinputmixer.html
(I'll change his stereo jacks, to separate R & L jacks)

And the other is:
http://www.musicfromouterspace.com/analogsynth/stereomixer.html
(use proper pots)

(and try some different opamps too)

If I use these two circuits, I will be left with 2 main stereo outs (R&L, R&L)...but I need only 1 stereo out (R&L). Where do I sum these two circuits together?...
A) before the opamps, using only one circuit, with a R bus, and a L bus ?
B) after the opamps, tied at the output jack(s) (like a y cable)
C) add a summing amplifier (opamp) at the output

(wait... C) won't work will it? That will give me the same volume regardless of the pots...? confused Confused
I'm going surfing for "summing amps" )


??

thanks,
=FB=
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Freq Band



Joined: Sep 05, 2006
Posts: 53
Location: Los Angeles

PostPosted: Wed Dec 13, 2006 4:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Despite all the wonderful suggestions, I saw that Ray Wilson (Music from Outer Space) has recently posted (Oct.'06) a more complete mixer that solves the questions I had.

It looks ......"Nice"

http://www.musicfromouterspace.com/analogsynth/STEREOMIXER2006/STEREOMIXER2006.php


Thanks for reading !! Razz

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