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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 amplifier became famous in the 1970s, it was sold in kit by Ibrape, Philips subsidiary for...
This circuit using current components was found in an old documentation. It is a sequential circuit...
This excellent amplifier with complementary symmetry output stage was taken from one of my audio...