Bjt as a switch9/27/2023 ![]() The second schematic follows (does not invert) the input. When a transistor is in a saturated on condition, both the collector-base and emitter-base junctions are forward biased. The transistor as a switch is used to turn ON or OFF a circuit. ![]() The assumption in both cases is that the base current is high enough that the BJT will be "saturated" ( \$V_\text\$ is high. BJT has a low switching frequency BJT has a very complex control The switching time is not very fast compared to a high alternating frequency of current and. A transistor is a three-terminal semiconductor device that can be used as a switch or amplifier. OBJECTIVES: 1) To study the switching parameters of an npn BJT under the effects of an inductive load, a snubber circuit and a free-wheeling-diode B. This produces a P ositive- N egative- P ositive type of configuration, with. Basically, in this type of PNP transistor construction, the two interconnected diodes are reversed with respect to the previous NPN transistor. In both schematics, you are supplying an input signal voltage at two levels: a more negative voltage, where the base current is effectively zero and the BJT is turned OFF and a more positive voltage where the base current is supplying usefully high levels of recombination current to the BJT so that it is effectively turned ON. Experiment 2 BIPOLAR JUNCTION TRANSISTOR AS A SWITCH A. The PNP Transistor is the exact opposite to the NPN Transistor device we looked at in the previous tutorial.
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