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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