ESP32 managed HF bandpass filter
The PCB supports 4 7 order bandpass filters. The filters are switched using AS169 gasfet switches.
The filters can be designed using elsie software of tonnesoftware (until 7th order free) http://tonnesoftware.com/elsie.html
The AS169 are switched by using I2C 2x PCF8574A. The boards can be cascaded.
