Complete Electronics Self-Teaching Guide with Projects

Working with Transistor Amplifiers

1 In Chapter 3 you learned how to turn transistors ON and OFF. You also learned how to calculate the value of resistors in amplifier circuits to set the collector DC voltage to half the power supply voltage. To review this concept, examine the circuit shown in Figure 8.1.

Figure 8.1

Use the following steps to find the value of R_B that will set the collector DC voltage (V_C) to half the supply voltage (V_S):

1. Find I_C by using the following equation:

2. Find I_B by using the following equation:

3. Find R_B by using the following equation:

Questions

Find the value of R_B that will set the collector voltage to 5 volts, using steps 123 and the following values for the circuit:

A. I_C = _____

B. I_B = _____

C. R_B = _____

Answers

A.

B.

C.