M2SYNTH Ring Modulator 151 User manual

Ring Modulator 151 V1b 1
Ring Modulator
Kit Assembly Instructions

Ring Modulator 151 V1b 2
Features
•Two modes of operation AxB where the output signal consists of the sum and the
difference of the input frequencies. A second mode is 2A where the output signal is
twice input A signal.
•Bypass controls to mix the input signals with the ring modulated output signal
Kit Contents
Description
Reference
MOTM
Qty
MU
Qty
Notes
Components Kit
7216-251-1
1
1
See BOM
Accessories Pack including:
7216-251-2
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
7210-189
4
4
8-Pin IC Socket
7212-331
2
2
Power Lead
7216-164
1
MOTM Front Panel
7216-551
1
Black
MOTM Back Panel
7216-851
1
MU Front and Back Panel
7219-551
1
Main PCB
7216-051
1
1
Jack Socket PCB
7215-722
1
1
Jack Sockets
7216-604
1
1
Pack of 4
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-7216-051-b
1
1
Circuit Schematic
S-7216-051-b
1
1
PCB Layout
S-7216-051-b
1
1

Ring Modulator 151 V1b 3
Assembly Instructions
Other than for chip U2, the Ring Modulator has no particular requirements not already
covered in the ‘General Guidance on a M²Synth Module Assembly’ booklet included with
this kit. U2 is surface mount but can still be easily soldered by hand using a fine tipped
soldering iron.
Calibration
This module requires calibration using Pr1 & Pr2 using a signal generator and an
oscilloscope. Don’t have the test gear? Listen to the output and adjust for the lowest
audible level where the text below refers to <30mV.
Apply a 1kHz, 10V P-P sine wave to input A with the toggle switch in the up position, Input
level pot at 100% and Bypass at 0%. Adjust Pr2 until output is <30mV P-P.
As above but apply sine wave to input B, adjust Pr1 until output is <30mV.
To prove operation, apply a 1kHz 10V P-P sine wave to Input A, toggle switch down and
check output is a sine wave at 2kHz (frequency doubling).
Specification
•Supply voltage +/-12Vdc
•Supply current +12mA / -12mA
•Main PCB dimensions 43.5x154.85mm
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