<div dir="ltr">Craig,<div><br></div><div>I was actually talking about the voltage rating of the optoisolator used to drive the FET gate. The image below more fully describes what I meant. I expect your final circuit for the fan would include most of the items shown below (I am not sure that you would need D2). </div><div><br></div><div><div><img src="cid:ii_k4x9k1l60" alt="image.png" width="562" height="457"><br></div></div><div><a href="https://electronics.stackexchange.com/questions/67663/criteria-behind-selecting-pwm-frequency-for-speed-control-of-a-dc-motor">https://electronics.stackexchange.com/questions/67663/criteria-behind-selecting-pwm-frequency-for-speed-control-of-a-dc-motor</a> <br></div><div><br></div><div>Shane</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 2, 2020 at 8:10 AM Craig Cook via TriEmbed <<a href="mailto:triembed@triembed.org">triembed@triembed.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:16px"><div dir="ltr">> 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">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"><br></div><div dir="ltr">Thanks</div><div dir="ltr"><br></div><div dir="ltr">Craig<br></div></div></div></div>_______________________________________________<br>
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