An oscillator that establishes the carrier frequency of the output of an amplifier or transmitter.
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The classic AM transmitter layout is a master oscillator,
followed by a "pen", or penultimate amplifier, followed by a PA or
power amplifier. The master oscillator, which is probably crystal
controlled, generates the carrier frequency.
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why ujt used as amplifier
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1.CE amplifier circuit
2.LC oscillator circuit
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Power supply, oscillator, modulator, and amplifier.