[sdiy] RE: [AH] Parametric EQ

[Chris Muir]

IMO, it's worth studying what Buchla did along these lines, with the  
291e Triple Morphing Filter. The combo of filters plus fairly  
sophisticated sequencer is really cool. External modulation, the type  
and depth of which is remembered for each step of the sequencer can be  
quite interesting.

- C

On Feb 20, 2010, at 5:22 PM, Tom Wiltshire wrote:

> Yeah, I've had a crack at this problem too. My version uses the  
> SSM2164 as a voltage controlled SVF, two amps for the filter stages,  
> one for the resonance, one for the amount. You can rack up as many  
> of these bands as you like, with three CVs for each band (Cutoff,  
> resonance, amount). My prototype has three filter boards.
> Morphing sounds like a great addition - nice work.
>
> T.
>
> On 20 Feb 2010, at 23:26, Scott Juskiw wrote:
>
>> I am working on something similar to this. My version is a single  
>> module with 5 (possibly 6) channels of bandpass filters. Frequency,  
>> resonance, and gain are fully programmable, plus it has the ability  
>> to morph between presets. I was really hoping to get it finished by  
>> next spring but that seems doubtful at the moment. Maybe by next  
>> fall. If you can wait for it, I'll let you know when I'm finished.  
>> I'll have PCBs for sale, same as my other projects.
>>
>>> I've suggested this before (maybe on other lists): It would be  
>>> swell if
>>> someone designed a single-channel parametric EQ PCB that allowed  
>>> full
>>> control over frequency, bandwidth, gain, and whatever else could  
>>> be thrown
>>> in for good measure. Then, the DIY crowd could adapt it to  
>>> whatever format
>>> they wanted. Did I mention CV control of the parameters? One could  
>>> then
>>> decide how many channels they want (3, 4, 16???) to build out a  
>>> super EQ of
>>> their own size. I know I'd be interested in doing this in MOTM  
>>> format.
>>
>>
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Chris Muir
cbm at well.com	
http://www.xfade.com