HifiBerry Amp 2 / RaspBerry Pi 3A compact upright amp V2
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Basic concept from my earlier model. 50wpc rated amp in 40Wx60Dx70H mm case.
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- Creative Commons — Attribution
My earlier model worked fine, but was tricky to assemble. And I thought I could clean up the SketchUp artifacts and reduce the size even further. Well, this is still a little tricky to assemble but does not require any hardware or a snap fit (uses friction fit now). Printed this on a Prusa Mini using PLA.
Set the base flat and right side up. Set the cover upside down.
Generate supports at 40degrees.
0.15 STRUCTURAL Print settings.
Generic PLA Filament.
Supports for support enforcers only.
I used a brim this time - the PLA roll I used this time tended to lift. I sanded the brim remains off the radiuses top of the cover. Worked okay.
I used onshape other than SketchUp for modeling this time. It's a much tighter, more professional design with native step file output.
Assemble the Pi and Amp2 with the GPIO/HAT connection.
Bend the rear connector plane face back (carefully) and slide the electronics assembly into the base. The Hifiberry and Pi external connections through the matching holes in the back and the boards into the slots in the base.
Slide the cover over the electronic boards and onto the base. The boards fit into slots on the cover, and the "legs" on the cover slide into the base. Seat it firmly down. The friction fit is sufficient to hold it together pretty tightly - the cover doesn't rattle and won't shake off.
Apply feet to the base - I just used some small round adhesive rubber feet I had laying around.
You'll need a power supply and your choice of software to drive the Pi. I am happy with HifiBerry's offerings. (Software, Power supply). Hifiberry has installation instructions for their software here.
Wire your speakers through the connector block and screws in the right rear corner. Polarity is marked on the board behind the block, visible through the screw access port.
Even thought this case has minimal ventilation, the Amp, 3A, and HifiBerry OS run pretty cool. The kit never got more than warm even with hours of pretty loud playback.
I think it sounds pretty good on the range of speakers I've used it with. It might best be qualified as mid-fi, but so were the speakers I used :-).