Intro: MP3 Speaker in 10 Minutes
Step 1: Stuff You Need
Step 2: Start Working
Open the Speaker from the power supply side.
Connect wires to the voltage regulator.
Insulate the regulator and wires with tape.
Find the 9 Volts DC coming from the rectifier circuit after the transformer , diodes and capacitors. This should be the input of the regulator.
Find the ground of the circuit. This will be connected to the ground terminal of the regulator and the negative terminal of the USB connector.
Weld the wire connected to the input terminal of the regulator with the 9 Volts point you found earlier.
Weld the wire connected to the regulator Ground to the Ground point you found earlier.
Step 3: Mount the USB Connector
Now , drill a hole in the speaker plastic wall and let the USB connector wire pass though it.
Make a knot in the USB wire so it cannot get out of the speaker.
Weld the USB wire to the points :
+ve of the USB to the output of the regulator.
-ve of the USB to the Ground of the regulator.
Step 4: Close the Speaker and Use the MP3
Now , close the speaker , put some MP3 files on the MP3 player and start using your new device.
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