HF to LF shelving filter - diyAudio
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Old 9th June 2012, 11:40 AM   #1
emosms is offline emosms  Bulgaria
diyAudio Member
Join Date: Sep 2010
Default HF to LF shelving filter

I found this extremely simplified schematic of a variable frequency HF shelving filter:
Click the image to open in full size.
Responds pretty well, at least at the simulation.
Is it possible to turn it to a LF shelving filter?
To cut/boost BELLOW the border frequency?
Best Regards
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Old 9th June 2012, 02:24 PM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Swap over C1 and (R5+RV2). Then check for stability.
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Old 9th June 2012, 06:23 PM   #3
emosms is offline emosms  Bulgaria
diyAudio Member
Join Date: Sep 2010
Just skimming through the book and couldn't even recognize
the simpliest topology of low/high pass filters
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