A soundcard interface needs no power supply and can be quite small if you
homebrew it to your own specifications.
Schematics can be found all over i-net.


"Please invert everything left of the @ to reply" a
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Looking to buy used a small TNC, to connect a small notebook PC and a
Yaesu
VX-5R. Everything (1 kg notebook, its 12v power adapter, TNC, X-5R with
its 12vDC power adapter) must fit in my briefcase with room to spare.

You kind on-topic assistance is appreciated.