filtering the output of a TWIN-T CPO using a custom build GAUSSIAN audio bandpass filter from W3NQN

[Chuck aa0hw]

for more info on this special custom build for filtering QRQ CW, from W3NQN, please see previous videos and their notes in their video descriptions:

https://youtu.be/lrJF2Av4k90

https://youtu.be/QJEK184CZPA