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 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 indeed 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 1volt/octave 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. 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
My MOTM-300 build from full kit

One Response to MOTM-300 Ultra VCO

  1. Richard says:

    Updated with new photos

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