Pete, For most cooling fans the 3 wires are: red = positive, black = negative, white = ground. A fan can create a lot of EMF, and the extra ground is to suppress the noise reaching the circuit board.
However, on other fans: red = power, black = ground, white = pulse control for PWM speed control. Either way, connecting red & black for full power should do the trick unless you want to wire up a 555 PWM controller with a small pot to control the pulse width. (ready-made circuit on Amazon: $7.50, https://www.amazon.com/gp/product/B00QGMESHM/ref=as_li_ss_tl ) Check out this blog on the subject: "About PC Fans" https://www.rollitup.org/t/about-pc-fans.385722/ or this one: "How to Create a Three-Speed Fan Control without Spending a Dime" https://www.hardwaresecrets.com/how-to-create-a-three-speed-fan-control-without-spending-a-dime/ or this video: "How to Power a Computer Fan" https://www.youtube.com/watch?v=1UgoiEsoMzU finally this article: "PWM 3-Wires Fan Controller with RPM feedback (Pulse Stretching Method)" http://pcbheaven.com/circuitpages/PWM_3_Wires_Fan_Controller_with_RPM_feedback/ - sgh On 2/2/21 1:15 PM, Pete Soper via TriEmbed wrote: > > I pulled a fan/heatpipe assembly out of a laptop to have for future > experiments and wonder what sort of control I need for it's three wire motor > connection? Here's the label on the outside. The DC resistance between any two > pins with any polarity is much higher than I would have expected: thousands of > ohms. > > Thanks, > Pete > > -- Scott G. Hall Raleigh, NC, USA [email protected] /Although kindness is rarely a job, no matter what you do it's always an option._/
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