DIY Kit for Polivoks Filter KR140UD1208, KR140UD8B, KT315G

Description

DIY Kit for Polivoks Filter KR140UD1208, KR140UD8B, KT315G
This lot contains three chips and one transistor.
The set is designed to build the filter of the legendary Russian synthesizer Polivoks (Поливокс) and contains new old stock (NOS) items only.
Package Includes
:
Chips:
УД1208 (КР140УД1208) = K140UD12 - 2 pieces
140УД 8Б = KR140UD8B = КР140УД8Б (rus name) - 1 piece
Transistor:
KT315G = КТ315Г(rus name)- 1 piece
This filter is a clone of the famous vintage russian analog synthetiser named  .Inside this synth there is an incredible and very original filter invented by Vladimir Kuzmin.
The clone contains only original cheap common parts, and it is very simple to build... No calibration trimmers or accurate tempco stages required.
Unlike most of Voltage controled analog filters who use a combination of a fixed capacitor with a variable resistor element ( OTA, opto,etc..) the filter core here is just a pair of programmable low power operational amplifiers ( PLPOA?). At first sight, it look like a classic SVF but with a difference: there is no capacitors ! CV modulations are applied on the current setting pin (Iset) to reduce or increase the GainBandwith of the aop who act as a variable time constant RC element. It is a 12dB filter. Sound as well. A bit wild at extreme Q, remind a little bit the Korg MS20 on this point . Frequency modulation work well with this filter!
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