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The Armstrong Oscillator is named for Edwin Armstrong, its inventor. It is sometimes called a tickler oscillator because feedback is provided using a tickler coil (T in the illustration) and is coupled by magnetically between coil L and coil T. The frequency of oscillation is determined primarily by the tank circuit (L and C in the illustration). In practice, the loading of coil T has some effect on the frequency of operation.
Basic Armstrong Oscillator
This is also the most common circuit used in the Regenerative Receiver.
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