Device Description; Interface Functions; Connection To Midi System; Standard Working Mode Set-Up - Roland SH101-M Owner's Manual

SH101-M

1. DEVICE DESCRIPTION

SH101-M is a MIDI retrofit for Roland SH-101 synthesizer. The device enables the instrument to
be controlled via MIDI as a MIDI expander. The interface works in one direction only – it receives MIDI
data and converts them to analogue control signals for the SH-101's BENDER, VCO, VCF, VCA and
CLOCK circuits. The SH-101's keyboard, control panel sliders and switches are not transmitted as
MIDI data!

1.1. INTERFACE FUNCTIONS

Functional block schematics on the pic. 1. bellow, shows the connection of the interface to the
original circuits of the instrument.
When the interface controls the keyboard of the instrument, the instrument's keyboard (CV and
GATE generators) is disconnected and the software generators [1 and 2] of the interface are used.
External CV and GATE outputs and inputs remain fully functional as on non-retrofitted instrument and
can be still used.
BENDER lever controller on the instrument's panel can be disconnected and replaced by the
interface DAC [3].
A voltage regulator is inserted between VCF-FREQ potentiometer of the instrument and VCF
control circuits [4] to control VCF frequency.
Another voltage regulator is inserted between VCA driving and the VCA [5] to control the VCA
output level.
Internal instrument's clock generator can be replaced with the software generator of the interface
[6]. Input for external clock (EXT-CLK-IN) remains fully functional as on non-retrofitted instrument and
can be still used.

2. CONNECTION TO MIDI SYSTEM

The interface has connectors for both MIDI input and output. Standard MIDI cables with DIN
41524 connector (5 pins / 180°) are used to connect other MIDI devices.

2.1. STANDARD WORKING MODE SET-UP

Data from host MIDI system (PC, sequencer, master keyboard etc.) are coming to MIDI-IN input
of the interface.
No part of this publication may be reproduced in any form without the written permission of CHD Elektroservis.
MIDI Interface for Roland SH-101
Pic. 1 – Functional block schematics
Copyright © 2017 CHD Elektroservis. All rights reserved.
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Model 8-438 ver. 1.0