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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 multiplies a time constant given by the input components. The circuit admits...
This circuit is nothing more than a powerful audio oscillator or buzzer with a power transistor. The...
An way to change the frequency of the previous oscillator (CIR112E) is to add a variable capacitor in the...