DIY Polivoks-inspired VCO

The core of the VCO is inspired by famous Russian synth Polivoks VCO and in exponential converter we use the original matched transistor IC that was used in Polivoks. But there are lot of innovative additions to have most from it in modular setup.
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

http://ericasynths.lv/en/shop/diy/diy-kits-1/diy-polivoks-vco-2/