Hi, First may I say that I hope none of the following comes across as inpenetrable or patronising. I know more about electronics than software and will probably need forum help with network GPIO control some day! Right then, I don't think that a bipolar transistor (pair) is the right solution here, ...

This is a pretty simple thing to do, I was revising this at work today. This article gives a good overview: http://www.eetimes.com/design/industrial-control/4009943/A-primer-on-high-side-FET-load-switches-Part-1-of-2- Alternatively you could keep it really simple by switching the IC's ground return ...

In answer to the OP's request for clarity and whether a coax cable could be connected to GPIOs for SPDIF... no, that won't work. For further details on the signal specification see [url]http://www.hardwarebook.info/S/PDIF[/url]. I2S is a chip-to-chip digital audio protocol whereas SPDIF is a device-...