Date: Thu, 11 May 1995 00:43:05 -0400 (EDT)
From: The Old Crow^? <oldcrow@access.mountain.net>
Subject: Re: Noise Makers!

> Um, how would you hook up a transistor like this?  It seems that you are saying:
>         +V                     Or is it:  +V
>          < R1                            R1<
>          >                                 >
>          |    /C--NC                       +-----E\
>          +--B|                             |       |B--out
>               \E--Out                    R2<     C/
>                                            >
>                                           Gnd
> 
> Is this what you mean?  How do I get the ground part of the circuit?

  It would look like this:

            +V (+9 to +15V)
            ---
             |
             /
        100K /
             /
             | + 22uF
             +--|(--+
             |      |
             /     ---  <--(GND)
         1M  /      -
             /
             |  0.047uF 100K       1M        100K      1M        1K
 NPN         +--|(------///----+---///---+---///---+---///---+---///--->
 2N2712      |                 |         |         |         |       out
 2N3392     E            (-) 2 +---|\    |   (-) 6 +---|\    |
       ___|/                       | \___|             | \___|
       |  |\                       | / 1               | / 7
       |    C-- (n.c.)   (+) 3 +---|/        (+) 5 +---|/ dual opamp =
       |                       |                   |      LF353, TL072, etc.
      ---                     ---                 ---    +9 to +15V = pin 8
       -                       -                   -     -9 to -15V = pin 4

  Add a 3080 stage and six buffer amps, and you have my Polysix noise mod.

> Do I just need to "balance" the transistor in a voltage divider?  This 
>sounds sensible to me, when I get the chance to breadboard it, I'll give 
>it a go.

  It's a diode in this circuit.  After you go through half a dozen 3392s,
2712s, etc. you'll find one that sounds nice.

  -Crow

/* Minimoog <> Jupiter 8 <> Voyetra 8 <> PAiA P4700j <> Polysix x2 */
/*              "VCO, VCF, VCA; to hell with the DSK!"             */