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1 kHz Audio Oscillator

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


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Books by VK3YE

Ham Radio Get Started (USA)

Australian Ham Radio Handbook (Aust)

Hand-carried QRP Antennas

More Hand-carried QRP Antennas

99 things you can do with Amateur Radio

Getting back into Amateur Radio

Minimum QRP

Illustrated International Ham Radio Dictionary

Make your Passion Pay (ebook writing)


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