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Transistor key or electronic key is used to control a powerful load on the low-power signal. Driving transistor switch includes the following elements. Bipolar transistor - the main element of the circuit and the current-limiting resistors, which protect it from overheating and breakdown. Calculation of the transistor switch is mainly in defining nominal resistances of said resistors. At the core of the transistor operation, at a time it is opened, and the next is completely closed. These modes are called the saturation and cutoff, respectively. This video details the method of calculation of the resistor and the choice of the transistor based on the value of the supply voltage, input signal and the load current. Also taken into account and the transistor gain.
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