[TriEmbed] Coffee roaster sanity check

[Shane Trent]

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 at 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
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-- 
[image: photo]
*Shane D Trent*
Patent Agent

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