untitled

Here are the steps involved in building the circuit:

1. Place the two LM385 ICs (IC1 and IC2) and 11 terminal blocks on the
   breadboard, as shown in Figure 5-4.
   As you can see in this figure, each terminal block has connections for two
   wires. Here’s what the wires get from each block will be connected to:
   
   
   • Wires from one of the terminal blocks on the right side of the figure
     go to the battery pack.
   
   
   • Wires from the other terminal block on the right go to the
     microphone.
   
   
   • Wires from the terminal blocks in the center go to the potentiometers.
   
   
   • Wires from the terminal blocks on the left side of the breadboard
     go to the LEDs.
   
   
   
   


2. Place the eight 2N3904 (Q1–Q8) transistors on the breadboard, as
   shown in Figure 5-4.

IC 2 IC 1

Q5 Q6 Q7 Q8

Q1 Q2 Q3 Q4

Figure 5-4:
Place the
LM385 ICs,
2N3904
transistors,
and terminal
blocks.

Chapter 5: Making Light Dance to the Music 95