Polivoks Filter

Here is a version of the Polivoks Voltage Controlled Filter.

Circuit is based on the LM4250 Programmable OP Amps.  Features:

• Resonance, or "Q" Control
• Cutoff Frequency Control
• LP and BP Filter Settings
• On-board LFO
• Frequency Control
• On/Off Switch
• FM Control (controls the amount of oscillation of filtering)
• 1/4" Input and Output Jacks
• Input Gain Control
•  True Bypass
• Runs on 12VDC input power

I used the LTC1144 IC to make a dual voltage power supply for the circuit (+/- 12VDC).  This worked the best, straight forward and effective solution.

Assembled Unit Demo:

Circuit in development:

Photos of finished filter.

Designed for those who want table top units, guitar pedal type FX units.