Good battery powered Toslink optical DAC needed


Anyone know of one? I have checked the Ack-Industries and Scott Nixon Battery operated D/A converters but I have been unable to find one that has a Toslink input for digital signal. Is there any made? Thanks for the interest.
128x128pugstub
Bjack70jr,

I'm curious. I have a Gamma unit hanging around right now, unused. What did it take to get it into your car system -- hard, easy? How vast an improvement has it made?

Thanks -- Tom
Scott Nixon offers a toslink input as an approximately $30 option to his NOS dacs. There is no switch between coaxial and optical, so you have to be careful to have just one input active.
California Audio Labs Gamma will work on 12 volts. I used to have it installed in my car stereo.
I am under the impression that toslink is just about the worst way to connect anything in terms of signal quality, anyone know if I am correct?