The Synthesis Technology E300 Ultra VCO is an analog oscillator based on the MOTM-300 5U module, with an updated design engineered in collaboration with Dave Rossum of Rossum Electro-Music.
The E300 uses modern temperature-controlled exponential converters without the expensive MAT-02EH + Tempco found in the MOTM-300. It also incorporates variable HFT (High Frequency Tracking) for a wider, more accurate 1V/Oct input. The SYNC circuit is a simpler hard sync type, with accurate detection of any waveshape/frequency used. There is an added -1OCT/-2OCT sub-octave squarewave output, which is phase-aligned with the sawtooth.
The VCO core is a new sawtooth-based circuit with improved linearity and a unique saw-to-triangle converter with no glitch in the transition peaks.
Just like the MOTM-300, the E300 is designed to be the best tracking analog VCO available (over 10 octaves) with the lowest temperature drift (typically less than 0.1Hz over a 24hr period).
SPECS
| Height | 3U (128.5mm) |
| Width | 14hp (70.8mm) |
| Depth | 32mm |
| Power | 16-pin Eurorack (55 mA from +12V, 40 mA from -12V) |
| CV Range | 10Vpp (-5V to +5V) |
| Audio Output | 10Vpp nominal +-0.35V |
| Frequency Range | 15Hz to 19KHz (no CV input) |
PANEL CONTROLS
| COARSE/FINE | Sets the initial VCO pitch with no CV applied |
| PULSE WIDTH | Modifies the width of the PULSE output |
| FM 1/2 | Attenuators for the FM inputs. FM 1 can be switched between EXP (exponential) and LIN (linear) FM. FM2 is linear. |
| SUB SWITCH | Controls whether the sub-oscillator output is 1 or 2 octaves below the initial oscillator frequency. |
INPUTS AND OUTPUTS
| 1V/Oct | 1 volt per octave control for the initial VCO pitch |
| FM 1 | VCO frequency modulation input with attenuator Can be switched between EXP (exponential) and LIN (linear) FM using the toggle switch. |
| FM 2 | VCO frequency modulation input, exponential FM, with attenuator. |
| Sync | Reset VCO frequency when input signal exceeds +1.7V |
| PWM | PULSE width modification input, with attenuator. |
| SINE, TRI, SAW, PULSE | The primary outputs of the oscillator |
| SUB | The sub-oscillator output. Can be switched between 1 or 2 octaves below the initial oscillator frequency. |
| _hp | 14 |