MOTM-390 Micro LFO

Quantity: 2 The MOTM-390 is a small, dual LFO. The first LFO uses a panel control, while the second is 1V/Oct voltage-controlled with FM. Individual LEDs follow the triangle waves … Read More

MOTM-380 Quad LFO

Quantity: 2 Modifications: none From the Synthtech website: The MOTM-380 has four LFOs in a compact package. The jacks are arranged in a unique way: The four outputs are individually … Read More


Quantity: 2 From the Synthtech website: The MOTM-320 is a full-featured Voltage-Controlled Low-Frequency Oscillator (VC LFO). The MOTM-320 has four individual outputs plus a master SHAPE control. This control voltage … Read More

MOTM-310 Micro VCO

Quantity: 0 Modifications: none From the Synthtech website: Using the same core circuitry as the MOTM-300 UltraVCO, the MOTM-310 retains its superior stability and sonic characteristics in half of the … Read More

MOTM-300 Ultra VCO

Quantity: 2 Modifications: none From the Synthtech website: The MOTM-300 Ultra VCO represents a milestone in analog synthesizer design. Using only the finest available circuitry, the Ultra VCO has unmatched … Read More

MOTM-190 Micro VCA

Quantity: 2 Modifications: none From the Synthtech website: The MOTM-190 is a dual VCA in a compact 1U format. VCA #1 can also be used as a Ring Modulator. Voltage … Read More

MOTM-480 3u Dual Filters

The MOTM-480 CS-80 Resonant Filter consists of two identical state-variable Voltage Controlled Filters. Each filter circuit features: 1V/Octave frequency control input FM input with reversible attenuator VC resonance input High … Read More


I decided to build a VCO using Ken Stone’s CGS48 PC board. My version is minimal; it omits the additional waveshapers that are on the board. I was interested in … Read More

Mixer-Comparator DIY Module

UPDATED FOR 2006 This 1U-wide MOTM-format utility module combines a two-input mixer with an inverter and a comparator to create a versatile signal processor. I’ll describe the circuits first, and … Read More

MOTM-120R Sub-Octave Multiplexer

From the Synthtech website: The MOTM-120 is based on an article in Electronotes, updated with improved and added features. The MOTM-120 contains two four-stage sub-octave dividers, a digital multiplexer, and … Read More