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Thanks for all the info so far! I built the circuit, but I wanted to test it before I plugged it into my motherboard. I have a handheld fluke scope how can I use it to see the signal. Would I need a 12V source and a resistor in line to see the response, or is there another way to test it with...

So would the 555 timer and RC circuit be a better solution to fake the rpm signal? https://www.techidiots.net/notes/fake-fan-sensor I can't find any thing on the specs about the output of the DROK signal generator.

Its not for a motherboard. Its for a hardware miner. The miner checks the fan rpm and shuts down if its not running at 4500 RPM. However I have heavily modified it so it cools with a different system and right now I just have to leave the other fans plugged in to trick the rpm sensor. My...

I believe your right about the blue wire being an RPM signal. My thoughts were the PWM signal generator I have could be used to create a rpm pulse train. It has two settings duty cycle and frequency. http://www.droking.com/index.php?route=product/product&product_id=819 In this listing it...

So I am modifying a system to use a lower rpm fan than it came with. This is the original fan.... http://partner.delta-corp.com/Products/FANUploads/Specification/QFR1212GHE-SP01(REV01).pdf The wiring says... Red = + Black = - Blue = STO Yellow = PWM The blue wire looks like a RPM reading off...