Bike Boombox

In this instructable I'll show you how to build a boombox for your bike. It's a cheap and useful project even for beginners. The device has a build in mp3 player chip with navigation buttons and with an LED screen. The power supply is a rechargeable 3.7v phone battery with 1000mAh of capacity. This is enough for about 10 hours of usage time.

We no need to connect our phone to this device because the mp3 player plays easily anything.

The speaker's imdependense is 8 ohms that would ensure a very cool music experience while cycling.

I really like to ride a bike and I go almost everywhere with my bike, but I like to listen to music too. So I just combined these two things together and created this DIY portable mp3 player. Now let see what you'll need for this!

Tools:



• Soldering iron
• Rotary tool
• Glue Gun
• Cutting and Crafting tools


Materials:



1. a plastic box
2. USB cable
3. 8 ohm Speaker
4. wires
5. a mp3 player-You can buy fake iPods like this here. You'll need to take out the mp3 player circuit. Follow the images and remove the battery because we no need this low capacity.
6. 1000mAh phone battery
7. LM386 audio amplfier chip
8. 470uF capacitor


That's all. This is a mono speaker device but you can add one more speaker if you make two amplifier circuits. Put the small battery away for another project.

You need to know that I changed the speakers three times until I get the best quality and sound. I know in the diagram is an error with the USB cable mark, sorry!



1. Follow the circuit diagramm and build the circuit. First make the audio amplifier circuit with the LM386 chip and with the 470uF capacitor.
2. Then add the battery wtih a switch.
3. Now you'll need to search the audio output pins on the mp3 player. Solder these to the ampifier chip's input pins, just like on the diagramm.
4. Add the speaker
5. Clean the USB cable's end.
6. And finally solder the USB cable to the battery.


This battery can't be overcharged, but please use a charging circuit. I used some heat shrink tube,but this isn't so important.

This step is pretty easy but you'll need to have forbearance. Cut a big hole for the navigation buttons, and some smaller holes abowe the speaker. One more hole will be needed for the power switch.

Get a glue gun ten fix every single component in the box. You can see detailed on the pictures, that how I made this.

I've found a few days ago a bike support module, but you can take from a bike light. Simply glue on the top of the box.

If your device discharged take out the USB cable then plug into your computer for about 2 hours.

Put the device on your bike and enjoy! Has a nice sound also whle ciclyng.

If you liked help me with a kindly vote on the Bike Contest. Goodbye and thanks for watching!