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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.
Random pulses are produced by this multiple oscillator using unijuncion Transistors. The...
Two alternating are produced by this circuit. The output signal must be applied to a power stage...
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...