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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 causes an LED to flash on a robot when someone speaks near him, showing that he is...
With this circuit it is possible to have a safe indication of the balance point for the signals of the...
This circuit was found in an old American publication. The integrated circuit used is no longer easy...