You could feed Allard's sidetone square wave into the clicky type transducer from Adafruit.
Or you could feed Allard's 5v DC signal that goes over to the 10k resistor into the modulator
as a source to a steady-tone-with-DC type transducer from Amazon (but choose one that works at 5v).
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On Sun, Nov 26, 2017 at 09:54 am, Jerry Gaffke wrote:
A buzzer like this could be used for a sidetone on the Bitx40 as well,
if you don't like how Allard is injecting a square wave into the speaker.
