Figure 5.10. The lower input terminal is grounded. The upper input terminal goes to the negative end of C1, 1 u f. The positive end goes to the base of Q1, 2N3904. The base also goes to ground through R1, 75 k ohm. We will return to the base later. The emitter of Q1 goes to ground through R2, 6.8 k ohm. We will return to the emitter later. The collector of Q1 goes through R3, 82 k ohm to plus 12 volts. The collector of Q1 goes to the base of Q2, also a 2N3904. The emitter of Q2 goes to ground through R6, 3.0 k. The emitter also goes to the positive end of C2, 25 u f. The negative end is grounded. The emitter of Q2 also goes through R4, a 75 k ohm resistor to the base of Q1. The collector of Q2 goes through R5, 4.3 k ohm to plus 12 volts. The collector goes to the positive end of C3, 5 u f. The negative end of C3 goes through R7, 51 ohm to the emitter of Q1. The junction of C3 and R7 goes to the positive end of C4, 5 u f. The other end of C4 goes to the upper output terminal. The lower output terminal is grounded. End verbal description.
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