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Thanks Brendan. I have a very low rds on N channel FET that I used for the DSLR cooling system. I think it meets all of the specs you mentioned and didnt need a heat sink. Given your figures, I suspect that it will do the job.
I needed a 750R to GND to pull down the gate on the cooling system. But I think we are working in reverse and setting a trip point with resistance for this application? visualising the set up.
Thanks for the scematics and links too. Much appreciated. It's a fascinating subject.
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