Mechanical Music Digest  Gallery
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Gallery > Tech > Octet

Octet Design
Octet Design Corporation Products
designed by Laurent Corey, Portland, OR
sold by MIDIator System, San Diego CA
data compiled by Robbie Rhodes

UM1 Universal MIDI Interface

UM1front.gif (4 kb)

PD1 perforator controller

[image needed here]

History of Octet Products

UM1  Universal MIDI Interface

The UM1 can be configured by the user either (1) to accept switch closure signals from 128 switches and output MIDI data at the standard bit rate to the MIDI wireline output connector, or (2) to accept MIDI wireline data and output switch closure signals to external devices such as organ valves.  A related but smaller circuit board (designated UM0, I believe) is employed in the PowerRoll device produced by Larry Broadmoore.

Variations offered, and the prices in 1996, were

UM1                                               $249.00
UM1-P      (higher-power version)                 $279.00
UM1-64     (64 notes)                             $198.00
UM1-BB    (128 notes, no display, no enclosure)   $187.00
UM1-64-BB  (64 notes, no display, no enclosure)   $157.00
UM2   [no data]

UM1 User's Manual  (revision 4-July-1997)  [[ yet to be compiled ]]
UM1 data sheet  preliminary data sheet 7/11/96
UM1 connector details

PD1 perforator controller

The PD1 circuit board accepts perforator control data from the host computer and outputs signals to 120 solenoids and the paper drive stepper motor.  Synchronization to the perforator is by signals from a photo-interruptor and shutter on the perforator crankshaft.  The system was a joint project developed by Laurant Corey and Wayne Stahnke.  Laurant designed and produced the circuit board, Wayne provide the "Punch" software program and drivers.  The circuit card was offered with driver transistors installed for all output channels (typically for organ use), or with 100 solenoid drivers plus 4 stepper motor driver transistors for use with a perforator.  Prices in 1998 were

PD1-100 (104 outputs) $479.00
PD1-128 (128 outputs) $509.00

PD1 shutter & trigger modes

PD1 Functional Test Procedure

PD1man.html (18 kb)    PD1 User manual (8-18-98) (18 kb)  (HTML)

1N6267A-D.pdf (66 kb)   Motorola Zener diode family 1.5KExxxA (1N6267A)  (PDF file)
mtd3055vlrev2a.pdf (210 kb)   Motorola power MOSFET  MTD3055VL  (PDF file)

PD1_Output_Configuration.gif (23 kb)
PD1_Output_Configuration.jpg (83 kb)

Errata, PD1 Output Configuration drawing:

1.  The sketch shows power FET IRFU320 (100v?).  The production board uses a MTP3055VL (60v), case 369-07.
2.  The PD1 output configuration sketch shows Zener diode 1.5KE100 (100v).  The production board uses a 1.5KE51A (51v).

10 July 2001

Home    Archives    Calendar    Gallery    Store    Links    Info   

Enter text below to search the MMD Website with Google

CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2018 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

Translate This Page

. .