Introduction: USB Powered Speaker
My laptop's speaker isn't loud and I have hard time listening to it when there's noise. Alternatively i have a speaker that runs on battery, whose battery drains fast. so i built this speaker which is powered by USB .
Step 1: Circuit and Components Required
- LM386 IC
- 8 pin IC base
- Type A USB Connector
- 3.5mm Audio Cable
- 8 Ohm Speaker
- Two 220uf Capacitors
- 10K Pot
- 10 Ohm Resistor
- soldering iron, solder
- hot glue (optional)
Step 2: Wiring in USB Cable
- Red wire +5 Volts
- Black wire Ground
Step 3: Wiring in Audio Connector (3.5 Mm Audio Jack)
The wires coloring may be different in different cables, to make sure of the coloring use the continuity test in multimeter.
connect the green and blue wires together and the ground wires together as we are not building a stereo speaker here.
- The green and blue wires together form the audio input
- The copper wires are connected to ground
Step 4: Connecting the Components
Connect the components on the general purpose PCB according to the circuit diagram. the 10 K pot will be used to control and vary the volume of the speaker.
Step 5: Casing for the Speaker
I used the food container for the casing. cut out the bottom of the food container in the shape of circle with a diameter less than that of the 8 ohm speaker.
Step 6: Fitting the Components Inside the Casing
make holes for the pot which will be used as a volume control and the USB and audio cables. Use hot glue to stick them in position and close the container.
Step 7: Finishing
Add a knob for the potentiometer, and any other modifications to make the speaker look good.