Hi from Trøndelag, although I live in Sweden now.
The power button in the previous post is perfect. If you choose another one, make sure it's the latching type and not momentary. Also consider if you really want the blue LED. It might look nice, but I bet you will get tired of it after a while. I have used orange for mine, it is much less disturbing.
I use . The LED is for 12V, so you have to use a 500-1000 ohm resistor to limit the current to the LED. (More and resistors.)
For power and loudspeaker connections, you will not need shielded cables. If you can get to Biltema, these cables will do just fine:
http://biltema.no/no/Bil---MC/Bil-tilbe ... ng-353833/. Get black and red cables.
Use 1.5 mm2 for power connections and 2.5 mm2 for the speaker connections. If the cable fits, use 2.5 mm2 everywhere.
To avoid wiring mistakes, always use red for positive and black for negative. Twisting the wires will give sufficient shielding, see this picture:
- IMG_20140930_1853131.jpeg (201.52 KiB) Viewed 2524 times
For audio connections, you'll want a shielded audio cable. It has two cable leads (red and black) and a shield. It's often called a microphone cable like this one at eBay:
http://www.ebay.com/itm/Microphone-Inst ... 2ed78c05d3. Five meters will give you a huge supply of internal audio interconnects.
There are a couple of ways to use this cable.
*
One cable for two channels: Red is right and black is left. Use the shield as ground for both right and left channels.
*
One cable for one channel: Red is positive and black is ground. Connect the black cable and the shield together.
VERY IMPORTANT:Do not connect the two negative speaker outputs to each other. It will only end in tears. The amplifier outputs are BTL (bridge tied load) which means that they don't have common ground.
Get some spacers as well, if you haven't already thought of that. You don't want to place the circuit boards directly on the bottom plate of your case, that will just create short circuits. These are the ones I'm talking about:
5mm M3 spacers, screws and nuts are best suited for both the amplifier board and the Raspberry Pi. Here's some I found on eBay, with the nuts:
http://www.ebay.com/itm/20-pcs-Brand-Ne ... 416e8f26b9.
You also need screws to go with the spacers, like these:
http://www.ebay.com/itm/25-Pcs-Philips- ... 3cce8b2622
by skrodahl » 19 Oct 2014, 22:02 
