VK3YE amateur radio pages

1 kHz Audio Oscillator


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This circuit consists of a CMOS square wave oscillator on a frequency of approximately 1 kHz.

The RC filter, which has a roll-off frequency of 500 Hz, filters the harmonics, providing a sine-wave output.

The oscillator has many uses; sidetone circuits in transmitters and signal injectors for audio tests are just two.

circuit of oscillator