> We make DMX LED controllers - the DMX front-end is a 65lbc179 that =

> feeds a fast opto-isolator.  The front end is powered with an =

> isolated DC-DC converter.
> =

> The 'lbc179 ** REQUIRES ** that you constrain its input signal to =

> within its common-mode range.  The easiest way to do that is to =

> require that the installer uses shielded cable to transport the DMX =

> signal, and to connect the drain wire at both ends.
> =

> We don't have ground-loop problems because the DMX front-end is =

> completely isolated from the rest of our circuitry.
> =

> dwayne

So the shield is not connected to chassie/earth?

/Ruben
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Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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=3D=3D=3D=3D=3D

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