Category Archives: audio

Ground Plane

This is my first attempt at making a ground plane in eagle. Hopefully it will sort out some of the problems I was having with the first PCB I made. I have also thickened the trace that led to the right channel, as one speaker was much louder than the other.

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Queen’s Homecoming featuring the big orange boombox

You can catch a glimpse of me and the boombox around 1:12. Let’s party!

TDA2009A Chip Amp

This is my first attempt at making a printed circuit board as well as making an amplifier. It came out much better than expected, and sounds great too!

The chuck barely holds the tiny bit.

My first PCB, thanks to cdx2000 for helping me design the PCB in eagle. cdx2000.blogspot.com/

Hooked up to power as well as a speaker. The resistors that are standing way off the board are only temporary as their value adjusts the gain, and they are much higher than recommended currently (Although sound quality is good). I used the boombox as a power supply.

Sometime in the future I plan to make another boombox with this chip amp (or multiples as you can bridge a few of these chips for more power) instead of using the power sucking car stereo.
For all of the arduino and POV type kits available, there does not seem to be much on the internet in terms of dead simple chip amp kits. I think that might be my endeavor.

Big Orange Boombox

Here are some pictures of the boombox that I took in the spring, while procrastinating instead of painting.

The stereo was made from a construction sign. I used a CNC router to cut out the panels and make holes for the speakers and ports. This wouldn’t be hard to make without a CNC, but my school had one so why not!

The top houses a car stereo. Above the stereo is a plate I made with external speaker output, USB charging, line in. Most of this is now redundant as I had to replace the car stereo ($100), and these days stereos come with USB, SD, and line in.
At the top right is the power connection for charging the stereo. It charges from a car battery charger.
The battery was a surplus 7Ah gel battery ($12) originally from princess auto, until it exploded. The new one is from canadian tire ($30)- they stock it as a replacement for one of their kiddy toys.

The speakers were salvaged from the side of the road. They are not very high end, but they were free. To get close to making the right size enclosure, I took measurements of the rotten speaker box that they came in, and then recreated that same volume when I designed the boombox.