We'll building this mini mac so it can be self contained. We'll need a battery pack for that! The 6600mAh pack is big but will run the setup for about 15 hours (or less if you add wifi and other accessories)
A PowerBoost 500 brings the LiIon pack voltage up to 5V and even has a spot for an on/off switch
Power Circuit for the Raspberry Pi Model B
The circuit diagram above is a illustration reference for powering the Raspberry Pi. A GPIO cable will conneect to the back of the PiTFT display. Wire #2 will need to be soldered to the postive pin on the Powerboost 500C. Wire #6 connects to the negative pin on the Powerboost 500C. The 600mAh lithium ion battery conncets to the JST port on the Powerboost 500C. A slide switch connects to the GND, EN and BAT pins on the Powerboost 500C.
Speakers
Connect the speakers with the following connections:
connect VDD to VBAT on the powerboost 500
connect GND to VND on the powerboost 500
see photo for audio connections:
connect R+ or L+ to R or L on the raspberry pi (use thin
blue wire)
and connect R- or L- to Gnd on the raspberry pi (ditto)
solder speaker to amp (L out or R out, whichever you
chose in the last step)
set both switches to ON (lowest gain!)
*|amixer cset numid=3 1
then:
|**||
speaker-test -t sine -f 600
||aplay /usr/share/scratch/Media/Sounds/Animal/Bird.wav*
*aplay /usr/share/sounds/alsa/Front_Center.wav*
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