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Here’s some schematics: http://www.epanorama.net/circuits/line_to_mic.html
Use the “20 dB PAD for line to electret microphone input” one but maybe add a trim-pot between your output device and this schematic. This is what I did to use one of those little “FM Transmitter Bug” kits as a cheap mp3 transmitter.
It’s hard to tell from your drawing if you are trying to solder an RCA jack or a plug. In either case, there has to be two different connections, one to the isolated center of the jack/plug and one to the outer ring. Usually, each of these has its own soldier tab but sometimes the tab for the outer ring is missing (or it’s supposed to be panel-mount in which case your supposed to use a little washer-type-of-thing with a soldier tab on it). I hope I made this clearer; it’s hard to describe these little parts. Anyway, soldier your ‘positive’ audio wire to the center part of the RCA jack and soldier the ground audio wire to the outer metal ring somehow and you’ll be fine.
