Make Electronics

Chips, Ahoy! 163

Experiment 17: Set Your Tone

Figure 4-21. These components should be

added on the same breadboard below the

components shown in Figure 4-14. Use the

following values to test the 555 timer in its

astable mode:

R1: 1K

R2: 10K

R3: 100Ω

C1: 0.047 μF ceramic or electrolytic

C2: 0.1 μF ceramic

IC2: 555 timer

R1

R2

R3

C1

9V

DC

IC2

C2

Loudspeaker

C3

Figure 4-22. This is the schematic version

of the circuit shown in Figure 4-21. The

component values are the same.

1

2

3

4 5

6

7

8

IC2

R1

R2

R3
C2 C1

9V

DC