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GUIDE TO ASSEMBLY OF ERICA SYNTHS POLIVOKS-INSPIRED VCO

If you are reading this, most probably, you are about to build Erica

Synths DIY Polivoks-inspired Oscillator. This VCO is 35mm deep,

skiff friendly, has solid mechanical construction and doesn’t require

wiring. The core of the VCO is borrowed from famous Russian synth

PolivoksVCO and in exponential converter we use the original

matched transistor IC that was used in Polivoks. But we significantly

updated schematics:

1)we introduced +-10V regulators for greater stability of operation,

2)we adjusted signal amplitudes to match requirements of

contemporary modular synths and made all output signals available

simultaneously,

3) we redesigned CV inputs to accept positive CV signals,

4)we introduced PWM circuitwith manual and voltage controlled

pulse width,

5)we introduced synchronization input, so you can sync the VCO to

other VCOs.

The Oscillator kit comes in three versions:

1)Set of 2 PCBs + matched transistor IC + mechanical parts (PCB

connectorsand spacer) + 5 position rotary switch,

2)Set of 2 PCBs + matched transistor IC + mechanical parts (PCB

connectors and spacer) + 5 position rotary switch + panel,

3) Full kit.

FEATURES:

•Triangle, saw and pulse wave outputs

•Manually adjustable and CV controlled pulse width

•Great tracking across 8 octaves

•Exponential FM input with attenuator

•Synchronization input

•Octave switch –5 octaves

•Skiff-friendly design

SPECIFICATIONS:

•Audio output amplitude10Vptp

•Octave rangeC0 –C8

•Panel width12HP

•Module depth35mm

•Power consumption34mA@+12V, 36mA@-12V

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The TUNE knob allows you to set the tune of

the VCO across two octaves

Use Octave switch to set octave the VCO tune

octaves up or down instantly

Adjust pulse width manually!

This is FM CV attenuator

These are VCO outputs. All three waves are

available simultaneously

Patch 1V/octCV source here. The VCO tracks

well across 8 octaves

Patch FM CV source here for vibrato effects!

This is VCO Sync input. Patch another VCO

output here to reset VCO circle. This gives you

new, interesting waveforms

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Patch PWM CV source here! 10Vptp CV signal

affects pulse width form 1% to 99%

Produktspecifikationer