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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. A fixed capacitor (C3) is connected between the VCC+ side of L1 and ground. C3 is a:
RF by-pass capacitor
C3 provides a low-impedance path to ground for RF signals at the VCC+ end of the L1 tank, preventing RF from entering the power supply and ensuring the tank resonates effectively.
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