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Voltage controlled low pass filter with resonance schematics, anyone? Answered

Can anyone provide a link or schematic for an audio low-pass filter with resonance, with the low pass frequency able to be controlled with varying voltage? I'm hoping to make something like the moogerfooger, but I don't need an envelope filter.

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steveastroukBest Answer (author)2011-11-16
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aelias36 (author)steveastrouk2011-11-16

Great! That's exactly what I was looking for. Not exactly small on parts, but it sounds great and is *much* cheaper than buying one. Any recommendation on how to get the -/+ 12v? I'll just use a computer PSU for breadboarding, but if i need to put it in an enclosure, and I need a good way to power it.

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steveastrouk (author)aelias362011-11-16

Its dead easy.

Get a mains transformer preferably centre tapped. Tie the tap to ground. Put a bridge rectifier across the other two terminals. Take positive juice off the positive terminal and negative juice off the negative terminal.

Connect a nice fat (try 1000uF) capacitor across the positve supply to ground, and another from the negative supply to ground.

Wire a 7812 regulator from the positive supply and a 7912 regulator from the negative.

Make sure you FUSE the input to the transformer - and I usually fuse the outputs too, using slo-blo fuses.

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akanksha19 (author)2012-04-11

do you have any idea of design of cerberus filter ????

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steveastrouk (author)2011-11-16

Do you mean like this ?
http://fluxmonkey.com/electronoize/opampFilter.htm

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