HF to LF shelving filter

emosms · 9th June 2012, 11:40 AM

Hi
I found this extremely simplified schematic of a variable frequency HF shelving filter:

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

DF96 · 9th June 2012, 02:24 PM

Swap over C1 and (R5+RV2). Then check for stability.

emosms · 9th June 2012, 06:23 PM

Thx!
Just skimming through the book and couldn't even recognize
the simpliest topology of low/high pass filters
Works!

9th June 2012, 11:40 AM	#1
emosms diyAudio Member Join Date: Sep 2010	HF to LF shelving filter Hi I found this extremely simplified schematic of a variable frequency HF shelving filter: 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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9th June 2012, 02:24 PM	#2
DF96 diyAudio Member Join Date: May 2007	Swap over C1 and (R5+RV2). Then check for stability.

9th June 2012, 06:23 PM	#3
emosms diyAudio Member Join Date: Sep 2010	Thx! Just skimming through the book and couldn't even recognize the simpliest topology of low/high pass filters Works!