M2SYNTH AP VCF 115 User manual

AP VCF 115 V1d 1
AP VCF 115
Kit Assembly Instructions

AP VCF 115 V1d 2
Features
1 Volt / Octave cut-off frequency CV)
Cut-off modulation input with potentiometer attenuator (FM)
Resonance potentiometer control with external CV control, self-oscillation at around
85% resonance
Kit Contents
Description
Reference
MOTM
Qty
MU
Qty
Notes
Components Kit
7216-215-1
1
1
See BOM
Accessories Pack including:
7216-215-2
1
1
Pot Sticky Pads
7210-188
4
4
10mm M4 Spacers
7210-186
4
4
M4 x 14 Cap Head Screws
7210-187
4
4
M3 x 8mm Stainless Panel Screws
7216-151
4
14-Pin IC Socket
7212-332
1
1
18-Pin IC Socket
7212-334
1
1
Power Lead
7216-164
1
MU Voltage Adapter
1
MOTM Front Panel
7216-515
1
MOTM Back Panel
7216-803
1
1U4P6S
MU Front and Back Panel
7219-515
1
Main PCB
7216-015
1
1
Jack Socket PCB
7215-723
1
1
Jack Sockets
7216-606
1
1
Pack of 6
B100k Pots Long Shaft Angled
7216-704
1
Pack of 4
B100k Pots Short Shaft Angled
7216-734
1
Pack of 4
KM20B Knobs
7212-104
1
Pack of 4
MU Knobs
7219-104
1
Pack of 4
General Assembly Guidance
Booklet
1
1
BOM
S-7216-015-d
1
1
Circuit Schematic
S-7216-015-d
1
1
PCB Layout
S-7216-015-d
1
1

AP VCF 115 V1d 3
Assembly Instructions
The All Pass VCF module has no particular requirements not already covered in the ‘General
Guidance on a M²Synth Module Assembly’ booklet included with this kit.
Calibration
1. Power up module and allow to ‘warm up’ for 10 minutes
2. Connect a 440Hz sine wave @ 10V Pk-Pk to Signal input 1. Resonance to 0%, Signal 1
Level to 100% & cut-off to 100%
3. Adjust Pr1 until output is 10V Pk-Pk using an oscilloscope.
4. Remove input signal.
5. Apply a CV of 0V to the COF CV In input. Increase resonance control until self-
oscillation occurs at approx. 10V Pk-Pk
6. Adjust cut-off until output is at 100Hz.
7. Apply a CV of 4V to the COF CV In input
8. Use Pr2 to calibrate at 1.6kHz (see note below)
9. Repeat from step 5 until 4V gives 1.6kHz
Note: If the frequency is flat (<1.6kHz), use Pr2 and make the frequency lower (flatter), if
above target frequency, use the trimmer to make the frequency even higher, this can be
counter-intuitive. You will soon get the feel of how much to increase or decrease the
frequency by.
Specification
Supply voltage +/-12Vdc
Supply current +13mA / -16mA
Waveform levels +/-5V
Frequency range: 20Hz to 15kHz without any CV applied
Main PCB dimensions 43.5x130mm
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