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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.
Found in a 1968 US publication, this circuit produces a delayed pulse with the negative transition...
We found this circuit in an American publication from the 50s. The transistors are made of...
This 2005 circuit was found in an English publication and can be implemented with virtually any...