Variable Frequency Oscillators (VFOs)
Secret # 1. Junction Field Effect Transistors (JFETs) The first secret of a stable VFO is using a JFET instead of a bipolar transistor. As described earlier, a field effect transistor is better because it is less sensitive to temperature. I have used 2N3823, 2N5484 and 2N4416 N-channel JFET’s for VFO oscillators.
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