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Where can I salvage a small amplifier circuit to power the skateboard boombox I built? (Yes, you read that right)

There's a slot in between the speakers to mount a tiny MP3 player. When you take it outside, the speakers are very low, and I'm assuming it's because there's no amp. I need something small and easy to hack, because I'm terrible at building my own circuits. And also a decent way to power it. Any ideas, friends?

Picture of Where can I salvage a small amplifier circuit to power the skateboard boombox I built? (Yes, you read that right)
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ajaster1 year ago

Try searching for PAM8403 Amplifier Boards on Ebay. They cost under $1 and will run on 3-5 volts. Just don't exceed 5 volts and you should be fine. I use these in everything from TVs to stereos and they work great! They are a class D amplifier too ho you get Hi Fi sound.

ambientvoid5 years ago
Just a question from me, do you ride the board while using the speakers? Can you hear music over the chatter of your wheels?
I wanted to try this for my skate speaker project but was worried about ripping the speakers apart on the ground, so mine are mounted up on top of the deck in a heavy enclosure...
noapparentfunction (author)  ambientvoid5 years ago
I tend not to ride it while playing, who knows, maybe I would if it sounded decent. It's too low to hear when riding. Strangely, facing the speakers at the floor have an odd "bounce-off" effect if you're indoors.

One of these days I'll run the amplifier through like these commenters suggested and make it really street-worthy.

And to answer your question, I've got about a half-inch clearance from the wheels to the ground. I used a hole saw to cut two circles straight through the deck and the magnet drivers sort of "float" inside this hole. The grip tape was applied directly over them. Of course, this weakens the structural integrity of the board but this wasn't built to be a trick board.
Iv seen a few novel downward facing speakers designed for indoor use which supposedly produce a '3D' surround sound, insofar as you can place them in the center of a room and hear music evenly from all sides. Does the scatter effect you observed have similar results?

I don't know if you're still looking for amplifier possibilities but if you don't mind chucking a bit of cash at it you might like to try looking at the amplifier kits on www.41Hz.com They're mostly designed to run from 12v but you can make a 12v strip from 8 AA batteries to conserve weight. Have a look for Mick on the 'Asbox Building' section on www.serpentineroad.com forum, you'll have to sign up to view it but that's who/where i got lots of great advice from for the very small and light amplifier on my speakers. =)
radiorahim6 years ago
You might want to buy this amplifier (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-380) It runs off of 8 AA batteries (held internally) and is pretty powerful. It's also small and light enough to mount with some tape or something on the kick tail. I use the amp in the boom box I made, check out my slideshow. Awesome build by the way.
onrust6 years ago
I cannot help you BUT......... your not terrible at building anything! Of course im old, but i still floss my Schmitt stick with Simms 73's
Amplified speakers for a desktop computer, I think that will be the easiest thing for you to reverse-engineer.  The following link points to some examples of the artifact of which I write, starting at 5 USD per.
http://www.geeks.com/products.asp?cat=SPK

But you probably already have something like this attached to your computer, or you know someone who does...  Sometimes old computer monitors have amplfied-speakers like this bolted to the side, if you know a place to look for discarded computer hardware.

You'll need a battery too.  I'd go with something in the range from 6 to 12 volts, capable of supplying maybe 0.5 to 1 ampere of current... a lantern battery, or 4 D cells,  something like that.
Re-design6 years ago
Find an old but working cassette recorder/player or an old walkman etc. These usually have small amps that can be easily reused.