Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in The thermionic triode , a vacuum tube invented in , enabled amplified radio technology and long-distance telephony. The triode, however, was a fragile device that consumed a substantial amount of power. In , physicist William Eccles discovered the crystal diode oscillator.
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Can you see through these real-life optical illusions? A C transistor is a type of negative-positive-negative NPN bipolar junction transistor. Typically, circuits where a low-current, high-speed transistor is required will employ a transistor such as the C transistor. Circuits such as a small-signal amplifier or a high-speed switching circuit might employ one or more C transistors. A C transistor can be used in several types of electronic circuits, but it is best suited for use in low-power applications.
Bipolar junction transistors contain three semiconductor regions: the collector, the base and the emitter. An NPN bipolar junction transistor — such as the C — contains a base region that is doped with positive, or P-type, semiconductor material, along with collector and emitter regions that are doped with negative, or N-type, semiconductor material. Some switching devices, such as electromechanical relays , might be too slow to turn a circuit on or off.
An electronic circuit containing a C transistor can be used in a switch circuit that requires high-speed switching. A typical relay might take five milliseconds to engage and 10 milliseconds to disengage, but a C transistor can switch on or off million times per second. Ad A C transistor also can be used in an amplifier circuit. Amplifier circuits use a transistor and direct current DC voltage to increase the power level of an input alternative current AC signal.
For an amplifier that is based on an NPN transistor , the AC signal is passed through the base region on the transistor. A voltage differential between the collector and emitter regions on the transistor add power to the AC signal, and the output AC signal is obtained by connecting the output device to the collector region on the transistor.
Each bipolar junction transistor contains several ratings that serve as a guideline for how the transistor is to be used. A C transistor is best used in low-power applications. The maximum voltage that can be applied from the collector region to the emitter region on a C transistor is 50 volts; otherwise, the transistor will overheat and fail. The maximum voltage that can be applied from the base region to the emitter region is 5 volts.
The total power that can be applied safely to a C transistor is 0. It is important for the transistor schematic to be checked to verify the electrical lead wire assignments.
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