Exp_7_Bipolar_Transistorsv06

Exp_7_Bipolar_Transistorsv06 - Bipolar transistors II Page...

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Bipolar transistors II, Page 1 Bipolar Transistors II Transistor circuits can be used to obtain stable sources of constant voltage. The following sections trace the development of a simple voltage source using a single transistor. Items marked with an asterisk (*) should be done before coming to lab. The pass transistor Build the emitter follower circuit below, called the “pass-transistor” circuit. (a) *Calculate the output impedance. Assume β =200. (Hint: It is approximately equal to the output impedance of the circuit that supplies the base current divided by β .) (b) Measure the output impedance by finding the change in voltage when the circuit is loaded by 150 ohms. (c) Reduce the input voltage from 15 volts to 10 volts, a 33% change. What is the percentage change in the output voltage? The Zener-regulated pass transistor Replace the 6.8k resistor by a reverse-biased 5.6 volt Zener diode (Fig. 2). (a)
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Exp_7_Bipolar_Transistorsv06 - Bipolar transistors II Page...

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