Variable Low Cut/High Pass Filter HPF

[cjonesplay]

Greetings, all! I wanted to be able to cut the heavy low end on my incredible Operadio Amp from the 50’s without having to lug a graphic eq around. So I found a second order harmonic active design that really drops things off below 100khz. I built it and it works for me, I added it to the end of a preamp circuit. The bypass switching is weird but works well.
Based on Project 155:  https://sound-au.com/project155.htm 


You can buy the PCB and see the schematic/wiring here: https://guitar-electronics.eu/en_US/p/HIGH-PASS-FILTER-HPF-PCB/326

[IvIark]

Nice job thanks for sharing

[Alamondm]

Yes very cool. Thanks