Shown here is a current source, a device that provides a constant current (in this case 1.4 mA), regardless of the switch position. The transistor's base voltage is fixed at 1.98 V by a voltage divider, which forces a fixed amount of current to flow through the base (14 µA). The collector current will be 100 times greater, as long as the collector voltage is not too low relative to the base.
This page is a utility for simulating источник тока на биполярном транзисторе online with specified initial values.










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