Sound Activated Switch

Project Number: 3

Parts Needed For Circuit: B1, 5, U1, 4, S1, 3, WC, 2, 2, SP, Black & Red Jumper Wires

OBJECTIVE: To show how sound can turn "ON" an electronic device.

Description: Build the circuit shown on the left by placing all the parts with a black 1 next to them on the base grid first. Then, assemble parts marked with a 2. Finally, lay the speaker (SP) on the table and connect it to the circuit using the jumper wires as shown. 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 close to the whistle chip (WC) or tap the base with your finger. The music should play again for a short time, then stop. Blow on the whistle chip and the music should play. You could connect the speaker using snap wires instead of the jumper wires, but then the speaker may create enough sound vibrations to re-activate the whistle chip.