How to convert a 3 pin (tachometer based) fan to a 4 pin fan (PWM + tachometer) without losing speed control?

If there is a PCIE module or some sort of USB device for this that works as well, I have spent about 3 months agonizing over how to do this since I want to be able to control it using this app, that way I can tie it into the rest of the system easily. Any ideas?

In that time, you must have created some schematics of both devices. Care to share?

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unfortunately I have not created any schematics as i have not found a way that would work for me, I generally try not not to plan for things i cant do and I usually just looks at pictures online, and most of them have yielded no useful results.

Using pencil and paper have always worked. If you, yourself, do not know how your motors are wired, how can you explain to to someone on the forum?

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What have you eliminated as a tach source?

It would help if you provided more information about what you’re describing. For example, if I had a 3-wire motor rated at 480V and 5 HP, it would be nearly impossible to answer a question about yours without a detailed schematic and links to technical information for all the hardware components involved.

Please include these details to ensure you get accurate and helpful responses.

Presumes you could take the fan apart such that you could put it back together as a functioning unit. As it's likely some "computer fan" the prospects are bleak.

these 3pin fan ports on this motherboard:
image

and this 4pin "PWM" fan

I am aware they work fine together, but I want to be able to control the speed, without using the CPU fan (which is the proper plug) since it is most likely intended for low power single fans and could potentially damage the motherboard.

I have 6 of these fans.

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