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It will indeed work with a raspi3. But time has moved on and as you way, there are other and better was to building this now. The push button has nothing to do with the software. It only switches the speaker between the mic input and the audio output. It is an external relay that makes it work.
They are ordinary electrical wires that you can find in old computers and stuff. If you have to buy them then buy AWG 24. It is a good standard gauge wire for electronics.
1. If there are capacitors on your USB soundcard, then they are ther with a reason so best to leave them om.2. Easy way to check whether your speaker works is to connect your usb soundcard to your pc and play some audio. to see if the input works you can try to record something.3. depends on what kind of burn damage.If traces are interrupted or components damaged then you card might not work properly anymore. If they are 'cosmetic' burn marks then it'll be fine.4. I'll lookup the XML parsing script. It's made in Python and uses an XML parsing library. It's not that difficult to make if you are familiar with python.
If have cartloads of them from my 30+ plants. This recipe works also great with rocoto, satans kiss and aji lemen chilis. I have about 6 or 7 big jars of them now. I have some peppers fermenting now for hot sauce and the rest of it will be dried for easy storage.
They are great with tacos but also on tot of a salmon sandwich. They are also a great topping for humus.But to be honest, I do eat them with everything...
this is a link to a circuit for an atari punk console with a 556 ic. The two pins that are not used in this schematic can be used for the cv input. http://www.jameco.com/Jameco/workshop/diy/ataripunkconsole-kit-fig4.jpg
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