MOTM-300 Ultra VCO

Synthesis Technology MOTM-300 Ultra VCO


Synthesis Technology MOTM-300 Ultra VCO

Full kit includes everything you need-- rare parts, panel, pcb, bracket, mounting hardware, pcb and panel components etc
This is the flagship MOTM module!

The MOTM-300 Ultra VCO represents a milestone in analog synthesizer design. Using only the finest available circuitry, the Ultra VCO has unmatched performance where it's needed most: stability and tracking. Using 4 separate temperature compensation servo loops, the average drift over 12 hours is typically 0.01% or about thirty times better than a Moog 921B VCO! Why do we call it the Ultra VCO? Because the tracking circuitry uses an ultra-matched differential pair transistor array that will hold over a minimum of 15 octaves. That's twice the range of a piano! Although we put the focus of the design on stability, the MOTM-300 is a full-featured VCO. Sine, saw, triangle, and pulse waveforms are all available simultaneously. PWM (Pulse Width Modulation) with initial pulse width and depth creates complex spectra. Other features include:

  • Dedicated 1V/Oct input with military-spec 25ppm 0.1% summing resistor
  • 2 separate Frequency Modulation (FM) inputs, each with it's own attenuator
  • Linear FM with switchable AC or DC coupling
  • PWM (Pulse Width Modulation) from DC to over 15Khz
  • Hard and Soft sync option with Master Sync I/O jack
  • Low power consumption, only requires +/-15VDC @ 60ma
  • All audio signals wired with coaxial cable for lowest noise and crosstalk
  • Low-drift op amps and precision resistors used throughout
  • 10 volts peak-peak audio outputs
  • Frequency range from 0.2Hz to over 38Khz


The cornerstone of any synthesizer is the VCO. We feel the MOTM-300 Ultra VCO has "raised the bar" and is, quite simply, the most accurate and best-sounding analog VCO ever offered.

Various types of linear FM timbres
Weird and wacky FM
Basic pulse lead sound over sampled drums
Square wave voice through Moogerfooger analog delay
Chaotic FM feedback
Strange clangorous FM


On Demand Info

These kits and assembled modules are offered on demand, click the link to learn more.


Module Parameters
Panel Size2U

Write a review

Please login or register to review
  • from $35.00 TO $349.00

Available Options

In stock / $45.00
Available : 23
In stock / $35.00
Available : 55
In stock / $95.00
Available : 23
synthCube kit
Out of Stock - $349.00

Tags: synthesis technology, module, motm, vco, oscillator, kit, diy, kits