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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.
This circuit is indicated to operate from high impedance sources as piezoelectric transducers....
A quartz crystal-controlled oscillator, capable of operating up to approximately 1 MHz, can be...
This circuit is based on an old operational amplifier, having been found in documentation from the...