Orb Amp - Amplifier for the Orb Speaker

thingiverse

This is the (pretty basic but functional) amplifier unit for my Orb Speaker (https://www.thingiverse.com/thing:2347532). The design matches what I tried to accomplish in the Orb Speaker design and allows you to hook up your iPod (or another device with a headphone jack) and play your tunes at a considerable level through the Orb Speaker. **You can of course also use any other speaker that is capable of running up to 12 Watts** The design centers around the Kemo M032 amplifier module, which is a pretty general purpose mono amp that comes ready to use molded in a plastic block. All you need to do is hook it's five wires up to the speaker, a power supply and an input and it is ready to rock. The Kemo unit should be pretty much available around the world (if not in a shop then use eBay). The great thing about it is that it is pretty much foolproof and runs on a wide variety of voltage and impedance without the need for any soldering. And even more important - I tested the unit for half a day and it hardly raised in temperature, which is a great thing when mounting it in a PLA print. Oh and, no need for the volume control suggested in the documentation of the Kemo module - just set the volume in the device you hook up to the Orb Amp In my version I have used a stereo 3mm jack. I have soldered two 1kOhm resistors to each of the stereo input channels and then ran those together to the mono input. I have designed the orb amp so the module easily fits in the "box". I have used a 3.5mm stereo jack for the sound input, a 3.5mm mono jack to allow for a 12 volt power input and an RCA jack for the output. For the rest all you need is a few screws, a few plugs and a bit of wire to make it all work!