I've been planning to make this for a while now but never had the time. I finally managed to make it. First thing needed are USB Powered Speakers with an AUX cable. I purchased mine at a local Thrifty Shopper for only $2! The goal: Replace USB power with a 9v battery.
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Step 1: 5v Regulator
Soldering is needed to make the 5v regulator.
You will need:
- 9v battery
- 9v battery clip
- 5v regulator
- 2, 1uF caps
- on/off switch
I am using a schematic from this page. I added a switch between the battery and the regulator.
After assembling the regulator we will put it aside.
Step 2: Disconnect Speaker
Since I'm only going to be using one speaker the other one is useless to me (at least for this project.) I disconnected it and tossed it into my parts box. Then I connected the left and right channels in order to receive both left and right channels from one speaker.
Step 3: Connect 5v Regulator
Follow the USB cable to the circuit board and to be sure, measure the voltage to get the correct polarity. In my case white was (-) and blue was (+).
Then I desoldered the USB cable (save it for another project!) and connected the 5v regulator circuit, red to positive and black to negative.
Step 4: Connect Switch
I then made a cut-out for the switch and connected it in series with the battery and the regulator. I attached the battery with Velcro to the inside-top of the speaker.
Step 5: Finished Product!
Last thing to do is flip the switch, plug in your aux cable, and enjoy your music!