Graphic EQ

[Tom Vyborny]

Hi guys,

Just a quick question here. How do I calculate the cut-off frequency of this stage of the graphic eq?
Thank you very much.

 

[Markw4]

You might want to take a look at this: https://sound-au.com/articles/gyrator-filters.htm#S14
There is a transistor gyrator filter shown in figure 7.1.1 that sorta looks like your circuit snippet.
Also some calculators at:
https://www.muzique.com/lab/gyrator.htm
http://tools.griffineffects.com/gyrator.php

 

[Tom Vyborny]

Thank you very much!!!!!