Hi James,

James Newton, webhost wrote:

> So, if I want to put out something that people can setup from a PC, a
> temporary connection via the parallel port is probably best. Now the
> question is how do I keep people from bread boarding something that connects
> via my device that will blow up the PC (as well as me probably) when they
> screw up?
>
> I went on a hunt for parallel port isolation and, not being the most
> brilliant analog electronics engineer (ok, so I'm a complete moron in that
> area) I really don't seem to understand most of what I found.

I do control some modelrailroad devices via the parallel port of my PC,
and use optocouplers to protect my PC. See for schematics:
http://www.robh.nl/art/s88lptw.gif. It might be a beginning.

Regards, Rob.

--
Rob Hamerling, Vianen, NL phone +31-347-322822
homepage: http://www.robh.nl/

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