Re: Transistor equivalent
As the unit is a variable speed controller I suspect that the FET is controlled by a simple variation of the gate voltage. I measured that with a multimeter. I don't think it's complicated enough to use PWM technology i.e. I haven't scoped it. So really if an uprated equivalent is available as previous posts suggest then I will go for that. In the mean time the current drawn by the fan is going to be compared with an identical unit. I am awaiting the results. The circuit is fused at 40A which would point towards a high expected current but of course this is not guaranteed.
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