JFET VCO (CB21133E)

This circuit was found in a Popular Electronics from the 90's. The frequencies depend on the components indicated in the table next to the diagram.

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3 V relaxation oscillator (CB8047E)
We found this relaxation oscillator in a 1967 General Electric documentation. The frequency is given...
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This circuit was found in the September 1984 issue of Radio Electronics magazine. The circuit has...
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Although the BD135 transistor is not specifically for RF applications, some of them can easily...