Schematics / Polivox VCF Layout
Schematics.PolivoxVCFLayout HistoryHide minor edits - Show changes to output Changed line 1 from:
[[!DIY]] | [[!VCF]] | [[!Vladimir Kuzmin]] to:
[[!DIY]] | [[!Filter]] | [[!VCF]] | [[!Vladimir Kuzmin]] Changed line 1 from:
[[!DIY]] | [[! to:
[[!DIY]] | [[!VCF]] | [[!Vladimir Kuzmin]] Added lines 1-3:
[[!DIY]] | [[!Voltage Controlled Filter]] | [[!Vladimir Kuzmin]] ---- Changed lines 6-7 from:
Unlike most of Voltage to:
Unlike most of Voltage controlled 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 on CV inputs work well with this filter! Changed line 10 from:
The vintage schematic has been to:
The vintage schematic has been slightly adapted to modern modular synthesizer standards Changed line 1 from:
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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. Please visit his web site at http://www.muztech.com . It is a Lowpass ( LP) and Bandpass (BP) voltage controled filter with a special design and sound . A Vodka filter...The clone contains only cheap common parts, and it is very simple to build... No calibration trimmers or accurate tempco stages required, it is not the spirit of this beast from the far East ... 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 on CV inputs work well with this filter! Schematics The vintage schematic has been sligthly adapted to modern modular synthesizer standarts 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 This the thread on the Forum ,the layout is built and confirmed Sebo : http://www.electro-music.com/forum/viewtopic.php?t=47831 %width=95pct% http://electro-music.com/forum/phpbb-files/top_177.png %width=95pct% http://electro-music.com/forum/phpbb-files/bottom_342.png %width=95pct% http://electro-music.com/forum/phpbb-files/polivoks_schem_695.jpg |
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