Unit Gain Stage (CB6157E)

This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms output. Input impedance is 1 M ohm.

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Telegraphy Practice Oscillator (CB16348E)
This circuit uses only two common transistors and provides good audio power in a speaker. Readers who...
Audio Oscillator 4001 (CB24350E)
Indicated for telegraphy practice, this circuit was found in the Radio Electronics magazine of...
3 Tone Oscillator (CB4187E)
This circuit appears in other articles and suggestions for circuits in this section from other...