Figure 4.33. The upper input terminal goes to the gate of an N channel JFET labeled Q sub 1. The lower input terminal is grounded. There is a resistor labeled R sub 1 from the gate to ground. The drain of Q sub 1 goes through a resistor labeled R sub 2 to plus 12 volts. The drain also goes to the base of Q sub 2 a PNP BJT. The emitter of Q sub 2 goes through R sub 3 to plus 12 volts. The collector of Q sub 2 goes through R sub 4 to minus 12 volts. The collector of Q sub 2 goes back to the source of Q sub 1. The collector also goes to the upper output terminal. The lower output terminal is grounded. End verbal description.