The electronics for this project are now available as a kit from Jameco electronics! Includes a blank PCB and all components/connectors required to build this project.
DISCLAIMER: Batteries can be dangerous. They can deliver high current if shorted out and start fires. If they are improperly charged it is possible they can explode. Please do not attempt anything that you are not familiar with and do not feel safe doing, and double-check your work. I am not responsible for any damage or injury due to misuse of these instructions.
Portable audio is a pain. Its either a huge boombox that eats D batteries like M&Ms, a bad-sounding iPod dock, or a virtually silent mini speaker set. None of these will do for a true music lover. Those who are so inclined and adequately skilled can build one that meets their exacting demands with relative ease. Now you'll be all set for a trip to the beach or camping.
A couple years ago while building an amplifier project I accidentally burned out the main driver from a set of Minimus 7 bookshelf speakers. Radioshack has sold this pair of speakers in various forms for over 30 years, and they are well known for their great sound and low price. I was quite bummed out that I was left with only one, collecting dust in my storage room, unlikely to ever be of use to me as a Hi-Fi speaker again.
Then I was inspired to turn it into a portable Hi-fi speaker by installing a rechargeable battery, charger circuit and amplifier. I had most of the parts needed lying around and managed to put the device together for only $15 additional costs. A thrifty shopper could probably do the project for around $60. Great value indeed!
In this guide, I will show you how I converted this speaker into a battery powered portable mini Hi-Fi system. It works great!