[vcf-midatlantic] OT: Pi RCA conversion

[Evan Koblentz]

> I'm reading this: 
> https://www.modmypi.com/blog/how-to-add-an-rca-tv-connector-to-a-raspberry-pi-zero 
> 
> 
> I cut one end off a generic yellow-tipped RCA wire and stripped back the 
> insulation.
> 
> Insider there's one insulated wire (yellow) and one bare copper wire.
> 
> Which is the positive/negative?

Further research (aka Google) indicates the center insulated wire is 
positive and the outer bare wire is ground/negative.

Someone stop me if that's wrong.