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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.
In applications where there is no danger of any contact with live points on the circuit by the...
We find this circuit in American documentation from the 1980s. It consists of a frequency folder...
This high quality audio preamplifier uses three bipolar transistor and is powered from 24 V...