The trouble with PWM fan circuits is they operate at around 25kHz, and the pulses are high current (we measured them from a Mac mini fan at over 500mA)-not ideal in a computer being optimized for audio. (See the excellent and not hard to understand tech explanation of fan control circuits at: PWM Fan Control. So the method used is called PWM (pulse width modulation), whereby the voltage sent to the fan is a train of DC pulses. smoothly varying the voltage to adjust the speed of the fan based on internal temperature) is prohibitive.
So why choose the UpTone MMK? Because it includes the world's first and only linear fan controller circuit for Macintosh computers.Ī little background: 3 and 4-wire fan control circuits are used in many modern computers because the cost, size, and heat to include linear DC control (i.e. The MMK also provides a carefully chosen amount of filtering (a pile of filter caps after a regulated external supply is not good for performance).Ĭonversion of a Mac mini to accept DC power is not new, and pairing the computer with a high quality external linear power supply is one of the best upgrades you can perform on this popular computer. There is no soldering and no cutting of wires required, the procedure is completely reversible, and a toolkit with detailed instructions is provided. The MMK converts a Mac mini to operate on external 12V DC power by replacing the computer's stock switch-mode power supply with a circuit board that fits perfectly in the space vacated by the SMPS. For modern Apple Mac minis (model years 2010, 2011, 2012, and 2014), our unique Mac mini DC-Conversion / Linear Fan Controller Kit (MMK) performs several functions important to elevating the audio performance of this compact computer.
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