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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.
We found this circuit in a 1989 publication. Its purpose is to produce noise in the VHF or UHF...
This circuit uses a photo-transistor to trigger a circuit sourcing a square signal for the output. The...
I found this simple circuit from an English magazine from 1984. The circuit can be easily...