Bipolar junction transistors (BJTS) can be turned on or off by base current. However, because the voltage drop at both ends of the base-emitter diode is largely temperature-dependent, a series resistor is required in many applications to keep the base current at the desired level, thus ensuring that the BJT operates stably and safely. Read this article to learn how to use RET to cope with the temperature dependence of standard BJTS.
View More >