Craig, 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).
[image: image.png] https://electronics.stackexchange.com/questions/67663/criteria-behind-selecting-pwm-frequency-for-speed-control-of-a-dc-motor Shane On Thu, Jan 2, 2020 at 8:10 AM Craig Cook via TriEmbed < triembed@triembed.org> wrote: > > 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. > > Oh, I am actually using one of these > https://cdn.sparkfun.com/datasheets/Components/General/FQP30N06L.pdf > (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. > > Thanks > > Craig > _______________________________________________ > Triangle, NC Embedded Computing mailing list > > To post message: TriEmbed@triembed.org > List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org > TriEmbed web site: http://TriEmbed.org > To unsubscribe, click link and send a blank message: mailto: > unsubscribe-triem...@bitser.net?subject=unsubscribe > > -- [image: photo] *Shane D Trent* Patent Agent 919-348-0061 | shanedtr...@gmail.com ShaneTrent.com | Skype: skype:shane.trent1 <#SignatureSanitizer_SafeHtmlFilter_> Raleigh, North Carolina <http://www.linkedin.com/in/shanetrent> <http://twitter.com/sdtrent> Create your own email signature <https://www.wisestamp.com/signature-in-email/?utm_source=promotion&utm_medium=signature&utm_campaign=create_your_own>
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