Originally posted by thecatsandi
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http://www.maxim-ic.com/datasheet/index.mvp/id/1262
http://focus.ti.com/lit/ds/symlink/cd4066b.pdf
http://search.digikey.com/scripts/Dk...=296-2061-5-ND
or just a Field Effect Transitor (FET).
But until such time as HS indicates that the I/O pins of the ADIO-100 have robust protection, I would hesitate to connect the I/O to any other active device that isn't powered from the same power supply or doesn't itself intrinsically provide the needed protection.
For example, you could connect the outputs to a DC-input/ DC-output Solid State Relay (SSR).Typically the voltage drop across SSR outputs device is low enough at small currents that it can bring the transistor collector close enough to ground (= 0) voltage.
SSR's typically provide a good isolation, but even on eBay, cost for each DC-DC SSR is typically $5-$8.
HTH ... Marc
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