English: This image depicts three methods of placing varicap diodes
in a circuit.
The simplest method involves placing the varicap in series
with the oscillator resonator inductive element with a D.C. blocking capacitor in between, then applying the D.C. bias to the varicap via a high value resistor (47-100K) to vary its capacitance and thus the resonant frequency of the circuit.
The second method involves using two varicaps in series, back-to-back. In this case no D.C. blocking capacitor is required, but the capacitance is halved.
The third circuit is similar but has two seperate A.C. and D.C. "earths" coupled by a blocking capacitor.
The blocking capacitors are in the range of 10-100nF.
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Captions
This image depicts three methods of placing varicap diodes
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