untitled

Insert each transistor lead into a separate breadboard row with the col-

lector lead to the left side (as shown in Figure 5-4), the base lead in the

center, and the emitter lead to the right. The pin designations of the

2N3904 transistors are shown in Figure 5-5.

3. Insert wires to connect the ICs, the battery pack terminal block, the
   microphone terminal block, and the potentiometer terminal blocks to
   the ground bus. Then insert wires between the ground buses to con-
   nect them to each other, as shown in Figure 5-6.

The ground buses are designated by a negative (–) sign on this

breadboard.

4. Insert wires to connect the ICs, the battery terminal block, and one of
   the LED terminal blocks to the +V bus. Then insert wires between the
   +V buses to connect them, as shown in Figure 5-7.

The +V buses are designated by a + sign on this breadboard.

5. Insert wires to connect the ICs, terminal blocks, and discrete compo-
   nents, as shown in Figure 5-8.

Base

Emitter Collector

Figure 5-5:

The 2N3904

transistor

pinout.

96 Part II: Sounding Off!