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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 is the receiver for the earlier system published in the August 1988 Radio Electronics...
This timer circuit uses a unijunction programmable transistor. The time is given by the capacitor and...
This calibrated circuit was found in documentation from the 1980s. It makes use of an integrated circuit...