This small circuit will produce a sine wave with a frequency of about 1KHz, ideal for testing electronic audio circuits. The circuit is based on a Wien-Bridge Oscillator which provides a sinusoidal output. It can be modified in order to produce other output frequencies such as 50 or 60 Hz by simply replacing two resistors.

Specifications:

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Supply voltage: 9V battery (not included)
Output frequency: approximately 1KHz
Output level: adjustable from 0 - 3V peak to peak
Current consumption: < 10mA