КАК РАССЧИТАТЬ ТРАНЗИСТОРНЫЙ КЛЮЧ

Calculate the transistor switch is quite simple. To do this, you need to know that the voltage in DC, the voltage value supplied in the base-emitter junction of the transistor, the parameters of the load included in the collector circuit. The transistor switch must provide full opening and closing of the transistor. From these considerations, the base current is calculated. To calculate the current, it is necessary to know the current of the collective; and current growth coefficient hFE. In this case, the collective load current is assumed to be equal to the load current, the value of which for insurance is reduced by half. This allows you to manage a powerful load on the signal, for example, coming from the microcontroller. Transistor key circuits use a common emitter circuit.