> This project also needs isolated rs485 (for DMX in/out), and rather than =
using the
> convenient but expensive MAX1480BCPI all-in-one chip as I have been doing=
, I'd like
> to make my own little iso dc/dc to save $ and likely boardspace and avoid=
 Maxim
> availability issues.

Sipex have an app note on doing isolated RS485 (and another on isolated RS2=
32). (They don't seem to put app note numbers on their documents). It looks=
 like they are using a 10base-T transformer for the voltage transfer.


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