Tuesday, April 27, 2010
Voltage Controlled Wah Wah for Modular Synths
YouTube via thecmpguru — April 27, 2010 — "This is a circuit I designed, based off of a multiple feedback active filter described by R.G. Keen (http://www.geofex.com/article_folders/wahpedl/wahped.htm).
The effect is a band-pass like response with a movable center frequency. Unlike Keen's circuit, however, the frequency of this circuit is voltage controllable (instead of manually using a pot). Also, I have increased the input impedance and made it non-inverting overall.
The circuit takes an input signal (typically, 5 Vp-p audio) and an input control voltage (tested ranges of -5V to 5V). It outputs the filtered audio with a potentiometer for controlling volume.
This demo shows a MOTM synth generating the input signal (a sawtooth wave) and the control voltage signal (from the LFO). The control voltage sweeping up and down is akin to a guitarist rocking a wah-wah pedal back and forth. But instead of guitars, here we're dealing with a modular synth.
Next steps..... make a prototype board of this sucker!"
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© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
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