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In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. The purpose of the variable capacitor is to:
tune L1 to the desired harmonic
The L1-C2 combination forms a resonant tank circuit in the collector. The variable capacitor C2 allows this tank to be tuned to resonate at the desired harmonic frequency of the input signal.
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