Oscillators: Audio Frequency

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Oscillators: Audio Frequency

The first kinds of oscillators that most people encounter generate signals to be heard as audible sounds. Here are some of the many ways to generate such signals.

Phase Shift Oscillator: A classic audio oscillator uses a series of RC low-pass filters to shift the phase of the signal by 180° to provide the required feedback.
Quadrature Oscillator: If we use two operational amplifiers connected as integrators, we can produce both a sine wave and a cosine wave, which looks the same but is phase shifted by 90°
Wien Bridge Oscillator: The Wien Bridge oscillator makes use of a frequency selective variation on the Wheatstone Bridge.
Function Generator: Sometimes we want square waves or triangle waves instead of sine waves. In such cases, a function generator can fill the need.