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Old 26th May 2012, 11:56 AM   #1
emosms is offline emosms  Bulgaria
diyAudio Member
 
Join Date: Sep 2010
Default parametric filter to shelving

Hi, got some books about op_amps and filter design, but still cannot handle it.
Dont get it which opamp does what.Is it possible to turn this section:
Click the image to open in full size.
//ibanez pql stompbox
into a shelving filter like this:
Click the image to open in full size.
//calrec pq1549
I like the design of the first schematic, using unipolar supply and having variable Q.
In general my idea is to remove the original low/high section from the ibanez pql and connect in series re-designed sections for low and high like the above mid section, with a shelving switch. Hope it won't introduce too much noise.
- - -
Don't get it also why the high parametric/shelving section of calrec pq1549 have one opamp more:
Click the image to open in full size.
Best Regards

Last edited by emosms; 26th May 2012 at 12:02 PM.
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