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Mini Speakers

ELECTRICITY LESSON 5

MAKE SOME NOISE

WARM UP (5 MIN)

In your notebook, always include the date, the lesson title, and do the warm-up task associated to that date.

Name 10 electronic devices that can produce sound.

WARM UP DISCUSSION (7 MIN)

Here we will discuss electronic devices that produce sound (there's a lot of them!). The goal is to have at least 20 listed.

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LAB: MAKE SOME NOISE

  1. Purpose: to understand how sound is produced through electronics

  2. Materials: speaker, breadboard, battery, battery clip, jumper wires, 555 timer IC, 10nF capacitor, 10uF capacitor, 100k resistor, and 10k resistor

  3. Procedure:

  • Step 1: Connect the 555 timer

    • It should go in the middle, over the middle notch, with one side of pins on the left side and the other pins on the right side. Pins 1 and 8 should be on the top.

  • Step 2: Set the frequency by connecting these to the 555 timer’s pins

    • 100k resistor

      • from pin 7 to the positive column

    • 10k resistor

      • from pin 6 to pin 7

    • 10nF capacitor

      • from pin 6 to the negative column

    • Jumper Wire

      • from pin 2 to pin 6

  • Step 3: Connect the speaker and capacitors

    • Connect the long leg of the 10uF capacitor to the pin 3 of the 555 timer, then the shorter leg to an empty row on the breadboard

    • Place one of the speaker wires onto the same row as the shorter end of the capacitor, and the other speaker wire to the negative column

  • Step 4: Connect three jumper wires from the 555 timer’s pins

    • from pin 1 to the negative column

    • from pin 8 to the positive column

    • from pin 4 to the positive column

  • Step 5: Connect the battery

    • The positive wire goes to the positive column, and the negative wire to the negative column

  • Step 6: Make some noise!

    • The speaker should beep if wired correctly. If there’s no sound, go back and check to make sure you did everything correctly.

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