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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 1970 publication by General Electric. The components can be changed...
This high-Q low-pass filter was found in the October 1990 issue of Radio Electronics magazine. The...
Generating a square signal (50% active cycle), this circuit was found in Siliconix documentation from...