Feedback oscillator can be assembled in other ways, for example by using MPF102 FET type, 2SK19 or 2SK192. Also on the fine tuner, can be varactor diodes are used to replace varco functions, such as the example shown in the circuit diagram of Figure below .
Similarly VCO circuit, the PCB is possible to make VCO circuit which vary. These variations are not discussed in this paper, but his fellow radio amateurs are welcome to create their own.
December 03, 2009
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