PowerPedia:Armstrong oscillator
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The Armstrong oscillator is an oscillator and is named after its inventor, Edwin Armstrong. This circuit is a form of the regenerative receiver.
Description
The Armstrong oscillator produces a sine-wave output of constant amplitude and of fairly constant frequency within the RF range. The oscillator is used as a local type in receiver, as a source in signal generators, and as a radio-frequency oscillator in the medium- and high-frequency range.
Armstrong oscillator are sometimes refered to as "tickler oscillator" because feedback is provided using a tickler coil. The feedback via magnetic coupling between a larger coil and a smaller coil. The frequency of oscillation is determined by the tank circuit, primarily. In practice, the loading of coil has some effect on the frequency of operation.
External articles and references
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