Evan,?
Thanks for the suggestion.? I implemented your idea and am very happy with the results.? Adds a little selectivity and really cuts down the background noise, ?
I used a dpdt switch so I can switch the filter in and out.? Took filter audio in from pin 5 of the Audio Header through the switch, Audio Header pin 8 for audio ground. ? Filter audio? out to pin 3 of the LM386, through the switch.? Power to the filter from the P5 header. Wired with arduino jumpers which fit the headers nicely. ? No traces cut, totally reversible except for a hole in the case for the switch. ??
73? /John
W7SWB
