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How to Make an LED Blink to Music With a Transistor by li haime





Article Author Biography
How to Make an LED Blink to Music With a Transistor by
Article Posted: 11/24/2014
Article Views: 659
Articles Written: 130
Word Count: 435
Article Votes: 0
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How to Make an LED Blink to Music With a Transistor


 
Science & Technology,Business,Public Speaking
How to Make an LED Blink to Music With a Transistor

For a simple electronics project, making an LED blink to music with a transistor is about as easy as they come. If you already have your soldering iron and solder, it’s also an inexpensive project with the parts you need usually costing less than $5 at any electronics parts supply store. Once you have your parts, you could be finished in less than an hour.

Instructions 1 Run electrical wire from the positive terminal of the 9-volt battery to the positive leg on one of the LEDs by connecting an alligator clip to the terminal and running the wire from the alligator clip to the positive leg of the first LED.

2 Connect the LEDs in series by wiring the negative leg of the first LED to the positive leg of the second LED, then the negative leg of the second LED to the positive leg of the third LED.

3.Wire the negative leg of the third LED to the middle pin of the Tip31 transistor.

4 Wire the right pin of the of the Tip31 transistor to the negative terminal of the battery using the alligator clip as mentioned in Step 1.

5 Prepare the headphone cable by clipping the cord before it reaches the headphones. Using the wire strippers, strip the rubber or plastic coating back about 1 inch to expose the three wires inside.

6 Connect the red or white wire from the headphone cable — either will work — to the left pin of the of the Tip31 transistor. Then connect the ground wire to the right pin where the connection to the battery is also located.

7 Solder all your connections.

8 Plug the headphone wire into a sound-generating source, turn on the music and enjoy.

Tips & Warnings Each LED requires 3 volts to work. If you wish to add more LEDs, you also need to increase your power size in turn.

The amount of electrical wire you need depends on how far apart you want to space the LEDs.

Mix it up with different color LEDs.

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