6/2/2023 0 Comments Transistor as a switch![]() 2 and it can be seen that current through the load can be varied from zero to a maximum value dependent upon the load value and this variation in the current is obtained by varying the base current of the controlling transistor. The load line for this circuit is drawn in Fig. DC load line drawn to show the linear variation of load current. ![]() The circuit consists of a load resistor R L fed from a battery V CC the transistor is connected in the path of the current flow.įig. (a) A CE transistor used as a rehostat to control current in the load.Ĭonsider the circuit given in Fig. ![]() The transistor when used as a switch must, therefore, be able to operate in cutoff region (open switch) and saturation region (closed switch) only.
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