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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: cpu cooler fan
Date: Fri, 29 Nov 2024 07:51:28 -0800
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On Fri, 29 Nov 2024 10:12:03 -0000 (UTC), Jasen Betts
<usenet@revmaps.no-ip.org> wrote:

>On 2024-11-27, john larkin <jl@glen--canyon.com> wrote:
>> A cpu cooler has a 4-pin connector for the fan.
>>
>> Does anybody know if the fan will blow up if the connector is plugged
>> in backwards?
>
>That would put 12V across the pwm input and pulse output, or are you
>also asking conerning other misalignments?
>
>They make these plugs with good alihnment features for a reason.

Just backwards. I am testing CPU coolers and had to hack a power cable
and connector and was wondering if fan makers considered this. Some
are specific that swapping the 12 volt polarity will not damage the
fan motor.

We want to bolt a bunch of TO-220 resistors to a copper CPU cooler and
mount all that on a PC board. Dynatron A41 looked fabulous, so I got a
couple and tried to tap one for bolting the resistors down. I missed
the tiny VC on the data sheet, which means Vapor Chamber. That became
obvious when I started drilling.

The Dynatron folks are great. The chat support people really know
their stuff, and they are super reasonable about making specials.

This is part of my resistor+inductor simulator dummy load project.

Here's a similar gadget, but with a wimpier cooler:

https://highlandtechnology.com/Product/P945

I want to dump more watts next time. 300 would be great... I'm not
cooling a CPU chip so could let things get very hot.