M2SYNTH Voice 108 User manual

Voice 108 V1d 1
Voice 108
Kit Assembly Instructions

Voice 108 V1d 2
Features
VCO Features:
1 Volt / Octave CV
Coarse and fine VCO frequency controls
PWM control
CV control of VCO pulse width modulation (PWM)
Sub-octave square wave output 1 octave below main frequency
Jacks for VCO Sine, Triangle, Saw and Pulse waveform outputs
VCF Features:
1 Volt / Octave CV
CV control of VCF cut-off, cross modulation and resonance
Controls for cut-off, resonance and cross modulation
VCA Features:
CV control of VCA level
Initial level control
LFO Features:
LFO waveforms square, saw, triangle & ramp
Level and rate controls
Gate Pulse Generator:
Gate rate control
Mixer Features:
Six mixer level controls for VCO pulse, sub-octave, saw, triangle, sine + noise
Common voice output jack
ADSR Features:
Controls for Attack, Decay and Release envelope phases along with the Sustain level
Time range selection switch x1 / x10
Gate input for full ADSR output
Illuminated manual gate button
LED indicator of gate pulse
ADSR output level control
Kit Contents
Description
Reference
MOTM
Qty
MU
Qty
Notes
Components Kit
7216-208-1
1
1
See BOM
Components Kit
7216-208-2
1
1
See BOM
Accessories Pack including:
7216-208-3
1
1
Pot Sticky Pads
7210-188
21
21
10mm M4 Spacers
7210-186
9
9
M4 x 14 Cap Head Screws
7210-187
9
9
Toggle Switch Dress Nut
7210-196
9
9
LED Spacer
7210-185
2
2
M3 x 8mm Stainless Panel Screws
7216-151
4
8-Pin IC Socket
7212-331
5
5
14-Pin IC Socket
7212-332
5
5
16-Pin IC Socket
7212-333
1
1

Voice 108 V1d 3
24-Pin IC Socket
7212-336
1
1
Power Lead
7216-164
2
MU Voltage regulators
2
MOTM Front Panel
7216-508
1
MOTM Back Panel
7216-808
1
MU Front and Back Panel
7219-508
1
Main PCB
7216-008
1
1
Jack Socket PCB
7215-724
1
1
Jack Socket PCB
7215-751
1
1
Jack Sockets
7216-613
1
1
Pack of 13
B100k Pots Long Shaft
7216-713
1
Pack of 13
B100k Pots Short Shaft
7216-743
1
Pack of 13
A100k Pots Long Shaft
7216-726
1
Pack of 6
A100k Pots Short Shaft
7216-756
1
Pack of 6
B1M Pots Long Shaft
7300-830
1
B1M Pots Short Shaft
7300-831
1
B10k Pots Long Shaft
7300-810
1
B10k Pots Short Shaft
1
KM20B Knobs
7212-121
1
Pack of 21
MU Knobs
7219-121
1
Pack of 21
General Assembly Guidance
Booklet
1
1
BOM
S-7216-008-d
1
1
Circuit Schematic
S-7216-008-d
1
1
10 sheets
PCB Layout
S-7216-008-d
1
1
Assembly Instructions
The Voice module has no particular requirements not already covered in the ‘General
Guidance on a M²Synth Module Assembly’ booklet included with this.
Calibration
1. Power up module and allow to
‘warm up’ for 15 minutes
2. With a scope connected to the
‘Pulse’ output, adjust Pr2 to give even
symmetry.
3. With a scope connected to the
‘Voice Out’, VCF cut-off & VCA Level to
100%, noise mixer control to 100%, adjust
Pr2 to give a an approximate 10V p-p
output signal level.

Voice 108 V1d 4
4. With a scope connected to the pulse output, all switches to centre off where
possible. Mixer noise control to 0%, mixer pulse control to 100%.
5. Set output frequency to 50Hz.
6. Apply a CV of 5V to the 1V/Oct input, use Pr1 to tune to 1.6kHz.
7. Repeat from step 5 until 0V gives 50Hz and 5V gives 1.6kHz
8. All mixer controls to 0%, VCA level to 100%, VCF resonance to 100% to cause self-
oscillation.
9. Adjust VCF cut-off to give 50Hz at the Voice Out
10. Apply a VCF CV of 5V and adjust Pr3 to give a 1V/Oct response
11. Repeat from step 9 until 0V gives 50Hz and 5V gives 1.6kHz
Specification
Supply voltage +/-12Vdc (note: this module uses two power supply connectors for
load sharing) Can be used on +/-15V MU systems when used in conjunction with our
inline voltage regulators
Supply current: J1: +68mA / -68mA, J2: +12/-26mA
Panel width: 4U
Waveform levels +/-5V
Main PCB dimensions 175.26 x 188.51mm
VCO frequency range without applied CV 20Hz to 13.6kHz
LFO frequency range 0.037Hz to 17Hz
Gate frequency range 0.038Hz to 9Hz
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