Adjusting Sound Level

Project Number: 4

Parts Needed For Circuit: B1, 6, SP, U1, 5, S1, 2, R1, 3, WC, 2, 2

OBJECTIVE: To show how resistance can lower the sound from the speaker.

Description: Build the circuit shown on the left. When you close the slide switch (S1), the music may play for a short time then stop. After the music has stopped, clap your hands near the whistle chip (WC) or tap the base with your finger. The music should play again for a short time then stop. In this project, you changed the amount of current that goes through the speaker (SP) and reduced the sound output of the speaker. Resistors are used through electronics to limit the amount of current that flows.