<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div dir="ltr" data-setdir="false">> The 4N25 is a common
choice but is rated for use up to only 30 volts while the HCPL-181 looks
to be around the same price and is rated for up to 80 volts.
<div><br></div><div dir="ltr" data-setdir="false">Oh, I am actually using one of these <a href="https://cdn.sparkfun.com/datasheets/Components/General/FQP30N06L.pdf" rel="nofollow" target="_blank">https://cdn.sparkfun.com/datasheets/Components/General/FQP30N06L.pdf</a> (32A, 60V). I was lazy doing to schema diagram. It's been updated again now. I think I have the diode in the correct place and direction.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Craig<br></div></div></div></body></html>