Do It Yourself:

 quad-VCO
 dual-VC-ADDSR
 dual-VCF
 dual-VCA
   modulator
 divider
 mixer
 sequencer
 SampleHold
 power-supply
 keyboard
 MIDI2CV
 sounds

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RM front
see the back of it

This is ballanced modulator, named usually as ring modulator. Based on AD633 multiplier.


Panel
DRY/WET knob:
controlls mix ammount of modulated signal and input signal
AC/DC MOD/CAR switches:
change coupling of modulation and carrier input respectively between AC and DC-coupled
MODULATION knob:
attenuator of modulation input
CARRIER knobs:
attenuator of carrier input
INPUTS:
MODULATION, CARRIER
OUTPUTS:
OUT


Schematics
krisak's design