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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Serge Resonant Equalizer Questions, samples?
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ericcoleridge



Joined: Jan 16, 2007
Posts: 888
Location: NYC

PostPosted: Thu Nov 17, 2011 12:34 pm    Post subject: Serge Resonant Equalizer Questions, samples? Reply with quote  Mark this post and the followings unread

Quote:
ericcoleridge wrote:
Does anyone have audio samples of the Serge 10-channel Comb Filter?

I'm also worndering if there'd be any inherent problem with taking individual outs from each frequency band?

It seems like a natural thing to want to do-- plus I've had this idea-- sort of inspired by the Moog Murf and the Buchla 296 Spectral Processor. I was thinking about sending each of 10 frequency bands to 10 inputs of a Patch/Switch Matrix, with each of 10 Matrix outputs sent to the inputs a 10-stage Sequential Switch so that Seq Switch Output rotates between the 10 different filter-band mixes. Doesn't that sound like a great idea? Not like it's my idea or anything-- it's esentially just a much more expensive implementation of a Murf. But, I'd really like to build it.


If you made individual outputs, you would need to add buffers to each of them. The same design of single op-amp buffer used on each of the comb outputs would do, with each of their non-inverting inputs connected directly to the outputs of each op-amp in the filter section.

No, I've not tried it.


What is the purpose of the buffer? To protect the circuit at the outputs? Or maybe to increase the gain on the individual outputs?

The Buchla 295 Comb Filter is quite similar (from what I can see) to the Serge, but sends each filter band to individual outputs before the mix stage (bottom of schematic). I notice that he doesn't use buffers on the outputs-- and I'm wondering, for the sake of learning, what the practical outcome of that would likely be. Is it going to potentially reduce the output levels?
Posted Image, might have been reduced in size. Click Image to view fullscreen.
and for the sake of comparison, the Serge Resonant Equalizer:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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otherunicorn



Joined: May 11, 2008
Posts: 136
Location: Australia

PostPosted: Thu Nov 17, 2011 1:29 pm    Post subject: Re: Serge Resonant Equalizer Questions, samples? Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
Quote:
ericcoleridge wrote:
Does anyone have audio samples of the Serge 10-channel Comb Filter?

I'm also worndering if there'd be any inherent problem with taking individual outs from each frequency band?

It seems like a natural thing to want to do-- plus I've had this idea-- sort of inspired by the Moog Murf and the Buchla 296 Spectral Processor. I was thinking about sending each of 10 frequency bands to 10 inputs of a Patch/Switch Matrix, with each of 10 Matrix outputs sent to the inputs a 10-stage Sequential Switch so that Seq Switch Output rotates between the 10 different filter-band mixes. Doesn't that sound like a great idea? Not like it's my idea or anything-- it's esentially just a much more expensive implementation of a Murf. But, I'd really like to build it.


If you made individual outputs, you would need to add buffers to each of them. The same design of single op-amp buffer used on each of the comb outputs would do, with each of their non-inverting inputs connected directly to the outputs of each op-amp in the filter section.

No, I've not tried it.


What is the purpose of the buffer? To protect the circuit at the outputs? Or maybe to increase the gain on the individual outputs?

The Buchla 295 Comb Filter is quite similar (from what I can see) to the Serge, but sends each filter band to individual outputs before the mix stage (bottom of schematic). I notice that he doesn't use buffers on the outputs-- and I'm wondering, for the sake of learning, what the practical outcome of that would likely be. Is it going to potentially reduce the output levels?


Actually, you are quite right. Just at 330 ohm resistors to each of the outputs you want. The buffer would insulate the filter cores from overloading, but the likelyhood of that happening is extremely remote.

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jean bender



Joined: Feb 21, 2010
Posts: 136
Location: france

PostPosted: Thu Mar 24, 2016 4:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi everybody :!

I'm sorry, my poor english doesn't let me understand everything here ! To gest descent individuals outputs on this filter, do i have to build buffers for each one, or just adding a 330r Resistor ?

Thanks per advance...
J.

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LFLab



Joined: Dec 17, 2009
Posts: 427
Location: Rosmalen, Netherlands

PostPosted: Fri Mar 25, 2016 12:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

There's a pcb available for the Serge resonant eq which adds individual band outputs, that pcb has buffers. (its the one with the illuminated sliders)
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