Protect PIC's input against "high" voltage using AD

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  1. - 29th May 2009, 18:02 #7
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    Quote Originally Posted by Joe S. View Post

    How about a crowbar circuit with a fuse inline with your sense line ?
    An inline fuse, an scr across the inputs, a zener to drive the scr gate, voltage goes too high, scr shorts inputs and fuse blows.
    http://www.radio-electronics.com/inf...ge_crowbar.php
    http://www.uoguelph.ca/~antoon/circ/.../SCR-Ovp2.html
    http://www.electronics-radio.com/art...protection.php
    http://www.ibiblio.org/kuphaldt/socr...ut/thyrcir.pdf
    Last edited by Archangel; - 29th May 2009 at 18:28.
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