Roy,

Check out http://www.analog.com and go to the Isolators section.  The 
only possible drawback is that they are all surface mount.  I use the 
isolated RS-485 chip and they work great.

Bill

Roy wrote:

>I was thinking of using HEX inverters and opto isolators that basically
>are two unidirectional circuits back to back.
>
>Works in simulation but do not know how well it will work in the real
>world :-(
>
>I want to opto isolate the JTAG programmer interface from the real world
>as I may otherwise and with Murphy's Law help blow up my programmer :-(
> 
>
>_______________________________________
> 
>Roy Hopkins
>22 Grenada Street
>Tauranga
>New Zealand
>3116
>_______________________________________
> 
>
>  
>

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