Polivoks inspired VCO with sync input and perfect tracking over 8 octaves.

The core of this VCO is borrowed from Polivoks VCO, but we added unique Sync feature to sync the VCO on rising or falling edge of the input signal. Syncable VCO is 35mm deep, skiff friendly, and consists of 2 paralel PCBs, doesn't require wiring, has 7 octave switch, and tracks perfect over 8 octaves.
Sync edge switch allows VCO to be locked to either rising or falling edge of the input wave. This feature has many uses:

As the input sync wave can be of any character and from any source, on arbitrary waves one edge may work better then the other.

Even when wave outputs of master and slave oscillator are simply mixed together, sync lock edge will determine the resulting shape due to addition or subtraction of different parts of waves. For example, if synced wave is square or saw, and the master is triangle or sine, edge setting will significantly change the timbre of resulting sound due to cancellation or boosting of the fundamental tone. When oscillators are multiplied (ring modulated) together, especially with complex waves, effect of sync edge setting may be even more pronounced, as different (shifted) parts of waves will get multiplied together.

Furthermore, if sync source wave is a PWM, sync edge setting determines if synchronized slave VCO will lock to the static or moving part of the wave. With dynamic pulse width modulation (especially - fast), slaved VCO pitch will sound different when set to synchronize to the moving part of input PWM.

Same as in Polivoks VCO case, you can build two VCOs – VCO2 with Detune (+-2 semitones) option and VCO1 with X-Mod (FM on audio rate) option. In Polivoks synth VCO1 was frequency modulated by VCO2.

 

      Prices:

  • Set of 2 PCBs + matched transistor IC + mechanical parts (PCB connectors, spacers and screws) + 2 rotary switches = 55EUR
  • Set of 2 PCBs + matched transistor IC + mechanical parts (PCB connectors, spacers and screws) + 2 rotary switches + panel = 75EUR
  • Full kit (Set of 2 PCBs + matched transistor IC + mechanical parts (PCB connectors, spacers and screws) + 2 rotary switches + panel + all parts needed) = 115EUR

+ 21% VAT for individual customers in EU without EU VAT registration number + shipping

 

Erica Synths Syncable VCO on Modulargrid

See the build thread @ Muffwiggler!

 

Technical specifications:

Frequency range

from LFO to C9

Available output waveforms

triangle, saw, 3x pulse, PWM

Output signal level

10V ptp

Power supply

+-12V

Power consumption

40mA (+12V), 36mA (-12)

Module width

14HP

Module depth

35mm

 

Disclaimer: please, if you have any questions on missing parts or similar issues, contact us within 1 months after receiving the kit!