Instructables

How to Build a Megaphone Bike Stereo

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Step 4: Cut mounting board

I decided the best place to mount would be under my seat in my underseat rack. I cut a piece of plastic to fit that space with minimal gap - I also cut mounting holes, the speaker hole, spacers and screw holes for the speaker.

And, while I was at it, I laser etched and painted my crest for a little extra personalization. By raster cutting at l medium power levels while keeping the protective paper on, you can create clean looking paint by laser graphics. By etching, then painting, then etching the paint off, you can easily create multi-colored and multi level graphics with laser precision.
 
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