Vacuum Tubes, diode. Diode: a device that only allows current to flow in one direction.. Filament to heat cathode. . . . ~6.3V. . V. . cathode. anode. Vacuum Tubes, triode. Triode: a device that controls (amplifies) a currents by a voltage.. . . Semiconductors, the p-n junction. Doping provides charge carriers that are very close to conduction band..
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