Low IF mixer idea ?

I've mentioned the Pitch Shifter design by PA0RDT before:

https://wb9kzy.blogspot.com/2022/02/single-pot-wien-bridge-audio-oscillator.html

https://www.qsl.net/ko6bb/files/pitchshifter.pdf

Then I noticed the neat single pot Wien Bridge audio oscillator.  But I ran across this article again tonight and realized that the pitch changer concept is very similar to the Low IF mentioned before:

https://wb9kzy.blogspot.com/2025/01/low-if.html

Why not use (as PA0RDT did in the Pitch Shifter) an active mixer to work as our low IF mixer ?

 

just replace the buffer and passive low pass filter with the active filter from the W6IOJ PSK circuit

  This would eliminate those two wacky audio transformers as well as the loss through the diode mixer (40 dB ?).

I just happen to have a bunch of SA602 chips (equivalent to the SA612, NE612 and NE602) - this may make it even easier to try the low IF idea.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm