M2SYNTH BR VCF 114 User manual

BR VCF 114 V1d 1
BR VCF 114
Kit Assembly Instructions

BR VCF 114 V1d 2
Features
•1 Volt / Octave cut-off frequency CV)
•Cut-off modulation input with potentiometer attenuator (FM)
•Resonance potentiometer control adjusts the bandwidth of the notch with external
CV control
Kit Contents
Description
Reference
MOTM
Qty
MU
Qty
Notes
Components Kit
7216-214-1
1
1
See BOM
Accessories Pack including:
7216-214-2
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
7216-514
1
MOTM Back Panel
7216-803
1
1U4P6S
MU Front and Back Panel
7219-514
1
Main PCB
7216-014
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-7216-014-d
1
1
Circuit Schematic
S-7216-014-d
1
1
PCB Layout
S-7216-014-d
1
1

BR VCF 114 V1d 3
Assembly Instructions
The Band Reject (notch) 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 100Hz sine wave @ 10V Pk-Pk to Signal input 1. Bandwidth (resonance) to
0%, Signal 1 Level to 100%.
3. Adjust cut-off until output is at a maximum level using an oscilloscope (there are two
peaks, either one is fine.
4. Using Pr1, adjust until output is 10V Pk-Pk
5. Apply a CV of 0V to the COF ‘CV In’input
6. Adjust cut-off until output is at a minimum level (finding notch centre).
7. Apply a CV of 4V to the COF CV In input (should move notch centre up 4 octaves)
8. Change the input frequency until the output is at a minimum level (finding new
notch centre). The applied frequency should be 1.6kHz. If not, continue to step 9.
9. Use Pr2 to calibrate at 1.6kHz (see note below)
10. Change the input frequency back to 100Hz
11. Repeat from step 5 until 4V gives a notch centre of 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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