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SCWIS is correct in pointing out the various differences in impedances and output levels among PC sound cards. The devices he has shown us, will make durable audio ‘in’s and out’s’ available fo pro or semi-pro levels and impedances. There are PC cards that can do that, as well, but they do live inside the noisy PC .
However, many times you can ‘luck out’, and get decent results with most 1/8th” line level outputs. It’s even possible to get digital SPDIF i/o s on some lower-end sound cards these days, if you like to be ‘creative’ with the hardware.
I’d be careful with an amplified earphone output without proper padding and matching, though. There’s too much chance of overdriving your audio into distortion, especially if it’s feeding a transmitter with no processing in front of it. They’re usually noisy, too.