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www.play-hookey.com | Thu, 03-04-2021 |
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Direct Current
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| Analog | Analog Experiments | Oscillators | Optics | HTML Test | |
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| Introduction to Oscillators | Audio Oscillators | LC-based RF Oscillators | Crystal Oscillators | | ||
| Phase Shift Oscillator | Quadrature Oscillator | Wien Bridge Oscillator | Function Generator | |
Oscillators: Audio Frequency |
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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.
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.
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°
The Wien Bridge oscillator makes use of a frequency selective variation on the Wheatstone Bridge.
Sometimes we want square waves or triangle waves instead of sine waves. In such cases, a function generator can fill the need.
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