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This variable frequency oscillator was found in an old American documentation. Transistors allow more modern equivalents and coil data are found next to the diagram for several frequency bands.
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...
We found this circuit in a Radio Electronics issue from August 1974. The frequencies generated depend...
This circuit was found in an old American manual. It is intended for testing SCRs and thermistors using...