hehee, Alan i just posted yesterday to use an opto.
May be you didn't get my mail ;)




alan smith wrote:

>The PIC is running on a 3.3V plane, where its isolated
>from the 48VDC input via a small isolated power
>module.
>
>The isolation amp had me thinking until I saw the
>price.  I need a low cost solution on this one, and
>the real purpose of this is to make sure I have the
>48VDC on the switched side of my hotswap FET.  So,
>maybe a simpler idea is to use a opto, and do a
>threshold test of say around 40V, so anything below
>that wouldn't trigger it.  Then its just a digital
>signal back to the PIC.  Gets rid of floating ground
>issues.
>
>Oh...and the 48-3.3V supply is not on the same rails
>as the 48VDC that I need to monitor.
>
>Alan K Smith
>Sr Designer
>Lfx Engineering
>
>
>
>		
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