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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 simple circuit of effects is interspersed between the instrument and the amplifier. It is...
January 2017 - STMicroelectronics' new TN4015H SCRs with 40 A currents and high temperature...
This circuit is for old telephones with analog lines. It was found in the May 1988 Radio...