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simple sweepable Highpass Filter?
simple sweepable Highpass Filter?
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Old 3rd June 2020, 04:31 PM   #1
yentzee is offline yentzee
diyAudio Member
 
Join Date: Jun 2019
Default simple sweepable Highpass Filter?

Hi,
sorry if I might have posted in the wrong forum. I wasn't sure where to post.
I am running an old Mackie CR16 Mixing desk which I like and which I am going to modify for the missing direct outs to track seperately into Ableton live.
Now the Mackie doesn't have Highpass Filters.
I really would like to add those (in a seperate 19 inch case) before the signals go into the desk.
Ideally would be a sweepable design going from very deep (dont know 20 Hz) to something like 100 or 150 Hz.
I have to build it for 16 channels so it would be great if there was a simple, effective and not too bad sounding solution for that.
On units like noisegates are sweepable Highpass Filters so I am hoping the construction wont eat up too much money.
Could anyone recommend a schematic for that?
My knowledge of electronics is very low but I am fine etching pcb's.
By loooking online this one comes up very often "20Hz to 200Hz Variable High-Pass Filter" however there seem to be two potentiometers to set the cutoff frequency which seems to be counterintuitive during mixing.
Help greatly appreciated.

Kind regards,

Jens
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Old 3rd June 2020, 06:18 PM   #2
Mark Tillotson is offline Mark Tillotson
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Join Date: May 2018
Location: Cambridge UK
Quote:
Originally Posted by yentzee View Post
By loooking online this one comes up very often "20Hz to 200Hz Variable High-Pass Filter" however there seem to be two potentiometers to set the cutoff frequency which seems to be counterintuitive during mixing.

One potentiometer, dual-gang. Necessary to tune a standard Sallen-Key 2-pole stage. For stereo you'd need quad-gang pot.
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Old 3rd June 2020, 07:28 PM   #3
yentzee is offline yentzee
diyAudio Member
 
Join Date: Jun 2019
Oh that is great. Didn't realize that it is one part. Then this might be a good option to use I suppose. Thanks for helping
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Old 11th June 2020, 10:38 AM   #4
Mark Tillotson is offline Mark Tillotson
diyAudio Member
 
Join Date: May 2018
Location: Cambridge UK
I put 10k,10k and 1uF,1uF into this design tool, Seems plausible. Sallen-Key High-pass Filter Design Tool
 

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