I purchased a UPS for my server stack that came with an annoyingly loud fan. Long story short, I replaced the fan with a Noctua to keep it quiet. The UPS was delivering 24V to the fan circuit, so I fixed that with a PCB and a resistor for the 12V Noctua. Runs great. Then I realized that the fan is not needed unless the UPS is tripped. All it is doing is creating noise and collecting dust. So I purchased a W1209 12V thermal controller board that I can set to trip at a certain temperature. It was then I realized I was in over my head. The 12V thermal controller board draws almost zero power when it's not tripped as it is only powering the thermal sensor and LCD display. At least, not enough power to register on my DC power supply. When the thermal board is tripped with the Noctua fan connected to it, it draws 0.10A, or 1.203W @ 12.03V. It seems wiring this together would go far beyond a simple PCB with a resistor, and hopefully not beyond what would be financially reasonable and beyond my novice capabilities. Essentially I need to drop from 24V down to 12V with a variable load. Any help or ideas would be greatly appreciated.
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