How to add a sidetone to a LM386 amplifier

Here a simple way to add a minimalist sidetone to a CW - TRX with LM386 amplifier.


The sidetone oscillates at about 800Hz.

The audio mutting occours when the cw key was depressed.

The audio level for sidetone will be adjusted by the 2k7 resistor value.


73 from PY2OHH Miguel