From wmm@acsu.buffalo.edu Tue Aug 30 15:08:41 1994
Date: Tue, 30 Aug 1994 12:52:50 -0400 (EDT)
From: "William M. Maciejewski" <wmm@acsu.buffalo.edu>
To: analogue@magnus.acs.ohio-state.edu
Subject: spring reverb plans, attempt #two

somebody please mail me if you see this!  thanks

Well, here's what you've all been waiting for.  Sorry bout the delays.
Anyway, I don't have a scanner, so I typed this in last night (at 1am,
hopefully I copied it right).  If it's unreadable you might want to check
the source directly, the book's at the bottom.  I hope I'm not violating any
laws by posting this.
I haven't tried building the thing, since I don't have any spring boxes,
but it doesn't look too complicated.  There was no info on which box to use,
so I suppose we take our chances.

in-+-+---+   +---+------------+------+-----+----------+---+
|    |   |   |   |            |      |     |          |   |
gnd  |   C1  R3  R4           |      |     |          |   |
     |   |   |   |            |      |     R7         |   |
     |   |   |   +-----+      +--+   |     |          |   on/off
     |   |   |   |     |      |  |   |     |          |   S1
     |   +---+--Q1     |     /   C2  |     |          |   |
     R1      |   |     +----Q2   |   R6    |         /    |
     |       R2  R5          \  gnd  |     +-------Q4     +-o +30v
     |       |   |     +-----+       |     |         \
     |      gnd  |     |          +--+     |          |
     |           |    R10         |       /       +---+
     |       +---+     |   +--C4--+------Q3       |   |
     |       |   |     |   |      |       \      C6  R13
     |      C3   R9    |   |     R11      |       |   |
     |       |   |     |   |      |   +---+   +->R14  bal
     |       +-+-+     |   |     gnd  |   |   |   |   |
     |         |       |   |         C5  R12 R15  +-+-+
     |        gnd      |   |          |   |   |     |
     |            +----+   |          +-+-+   |    gnd
     |            |        |            |     |
     |            +-reverb-+           gnd    |
     |             |spring|                   |
     |            +--unit--+                  |
     |            |        |                  |
     |           gnd      gnd                 |
     |                                        |
     +----------------------------------------+------+out
                                                     |
Parts List                                          gnd
R1  2.2k    R8  not there  R15 2.2k    Q1  TIS58
R2  1.5m    R9  10k        C1  .01uF   Q2  GE20
R3  22m     R10 2.2k       C2  100uF   Q3  GE20
R4  47k     R11 10k        C3  5uF     Q4  GE20
R5  3.3k    R12 10k        C4  5uF     
R6  100k    R13 10k        C5  30uF
R7  47k     R14 15k pot    C6  10uF
Schematic from Brown & Olsen, "Experimenting with Electronic Music,"
pages 101-104.


I hope this is readable format.  It's my first attempt at putting circuits in
ascii.  Let me know if it works out.  Also, R8 isn't on the diagram.  Seems
that they skipped over it?  Is something missing?  Only "Brown & Olsen" know
for sure. :)

p.s. this is the same book that the "theremin" circuit that's out on the
net came from.

enjoy
-bill