mandag 28. januar 2019

Jupiter 6 All pass filter

This post

mentions that by mixing the input with 2 x the BP filter, you'll get an all pass filter. The same does this pdf:

I tried this with some success. I had to disconnect the 33k resonance resistor, but after this I got a response with a slight 667 mdB notch.

I will try breadboarding this later.
The MT-223-pdf also mentions an alternative way of doing a notch filter:

Which gives this notch:

As opposed to the notch we get by mixing LP and HP:

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