Thanks Alan,

Now were talking, just what I need.

alan smith wrote:

>HCPL3700 
>
>Lee McLaren <lmclaren@tasnet.net> wrote:Hi,
>Can anyone suggest a way of building a opto isolated input to feed a PIC.
>I would like to be able to feed in say 5 to 250 volts ac or dc, 
>frequency response is not important as the pins are only sampled every 10mS.
>
>I was considering feeding an opto coupler with a bridge rectifier and a 
>small filter cap (i don't want 50Hz ac to appear as if its going off and 
>on) but the wide voltage range has me wondering if there is a better 
>way, maybe some sort of constant current.
>
>I am just thinking I may be over designing this a bit.
>
>regards
>
>Lee McLaren
>  
>

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