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Audio phase shift circuit design wanted.
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Jim-0000:
I understand a variable delay filter can be built around a NTE1641 or a 2399 chip.
If someone can suggest a circuit or a link to a page that might have one, I would much appreciate it..


Jim.
frozenfrogz:
PT2399 is pretty straight forward, datasheet features basic schematics for echo and delay applications.
Also: http://www.diyaudiocircuits.com/tutorials/pt2399-digital-delay-analog-echo/
ledtester:
Supposedly the NTE1641 is a replacement for the MN3007:

https://www.diystompboxes.com/smfforum/index.php?topic=48790.0

In the datasheet for the MN3007 there is an example application circuit:

http://www.kazumi-kikou.com/pdf/3007.pdf

The example circuit employs a MN3101 as a "BBD clock generator". This thread suggest that more common CMOS logic chips can be used to replace the functionality of a MN3101:

https://www.diystompboxes.com/smfforum/index.php?topic=72447.0
SiliconWizard:
Just nitpicking here, but strictly speaking, a fixed delay will only give a fixed phase shift at one specific frequency. So you have to make sure a delay is what you really need.
Jim-0000:

--- Quote from: SiliconWizard on July 10, 2019, 12:03:27 pm ---Just nitpicking here, but strictly speaking, a fixed delay will only give a fixed phase shift at one specific frequency. So you have to make sure a delay is what you really need.

--- End quote ---

Good point and you are right, a delay may not work for what I want.
I want to invert the phase of perceived (or actually heard) frequency of a Tinnitus sufferer.
So, the phase shift (of 180 deg) will need to be adjustable for any frequency over the audible spectrum.
Alternative suggestions most welcome.
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