CW Sidetone Generator

  
This circuit is about as good as it gets for generating morse code tones. It may be used as a code practice oscillator, a tone generator for a keyer, a sidetone oscillator for a CW transmitter or an audio Modulated CW (MCW) generator for an FM transmitter or repeater.
CW Sidetone Generator - schematic

One may think that this is a lot of circuitry just to make simple beep tones, but the real value of the circuit is that it sounds very smooth when compared to a clicky and harsh-toned square wave code oscillator. This circuit won`t hurt your ears, ev



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