Description
Designed and produced in the USSR, the mono analog synthesizer Polivoks gained its fame in the west due to the unique sound of the filter implemented inside it. Baptized as “Vodka Filter” (Vodka filter) with the ability to switch between bandpass and low-frequency modes of operation, this filter has become the object of attention of many musicians, both amateurs and professionals.
К особенностям своей версии Марк относит:
Added output amplifier-buffer stages for both outputs with a gain of 11, because the audio level on outputs is rather low
The vintage filter was powered with +/-12.5V. The clone can also work under +/-15V
CVs calibrated because programmable aop have a range for the Iset pin were they work fine
Added a reversible cutoff frequency CV attenuator (option)
A fixed attenuator ( 100k ajustable pot ) added to the audio input jack to avoid overload -not on the schematic
Files
| Title | Version | Creation date | Copyright notice | Software | Download link |
|---|---|---|---|---|---|
|
Filter Core
The core schematics of Mark's version |
0.9 | 9/13/2018 | Marc Bareille, Vladimir Kuz'min | DipTrace Schematics | Download PDF |
Bill of materials
| # | Value | Quantity | Designator | Comment |
|---|---|---|---|---|
| Semiconductors | ||||
| 1 | TL072 | 2 | U3, U1 | |
| 2 | UA776 | 2 | U5, U4 | |
| 3 | 2N3904 | 1 | Q1 | |
| 4 | LF351 | 1 | U2 | |
| Resistors | ||||
| 1 | 10k | 3 | R10, R24, R1 | |
| 2 | 100k | 8 | R12, R15, R16, R23, R5, R6, R9, R4 | |
| 3 | 110k | 2 | R14, R13 | |
| 4 | 47k | 4 | R17, R19, R20, R3 | |
| 5 | 1k | 4 | R18, R22, R25, R8 | |
| 6 | 162k | 1 | R11 | |
| 7 | 3k | 1 | R2 | |
| 8 | 27k | 1 | R21 | |
| 9 | 220k | 1 | R7 | |
| Capacitors | ||||
| 1 | .1uF | 10 | C10, C11, C12, C3, C4, C5, C6, C8, C9, C2 | |
| 2 | 1uF | 2 | C14, C13 | |
| 3 | 10uF | 2 | C7, C1 | |
| Inductances | ||||
| 1 | Bead | 2 | L2, L1 | |
| Other | ||||
| 1 | 3.96-3P | 1 | J1 | |
| 2 | 2.54/2P | 4 | J2, J5, J6, J7 | |
| 3 | 2.54/3P | 3 | J3, J4, J8 | |