If you can't hear it then see it.
http://www.k6xx.com/radio/vizicw.pdf
This is a simple and cheap circuit to build. By
adjusting RT1 and RT2 using switched values you can
make the circuit center on a number of center
frequencies. Connect it to the line level audio
output. I built one that is discretely centered on 4
switchable freqs: 280, 350, 500 and 700 hz. Most of
my listening is at 350.
73 W9OY
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