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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Thermally controlled fan - convert to fixed/manually variable
Hi
I have a thermally controlled 120mm fan. It's an Antec 120mm Smartcool. It has a thermister which protrudes about 2.5cm/1" from the the bearing, on a slight angle into the case. It spins at about 1100rpm max. It's too far from the heat source, 'miles away' and I need it to spin to its max of about 2000rpm. I was thinking about replacing it with a resistor/variable resistor but wasn't sure of the resistance required. What do you think? Any resistance? Boom boom. Thanks Darren |
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"Darren" writes:
Hi I have a thermally controlled 120mm fan. It's an Antec 120mm Smartcool. It has a thermister which protrudes about 2.5cm/1" from the the bearing, on a slight angle into the case. It spins at about 1100rpm max. It's too far from the heat source, 'miles away' and I need it to spin to its max of about 2000rpm. I was thinking about replacing it with a resistor/variable resistor but wasn't sure of the resistance required. What do you think? Any resistance? Boom boom. The most common thermistor is 10K ohms at 25 degC but it's a simple matter to measure it and simply experiment with a pot. You can also put a pot in parallel with the thermistor which will effectively shift the operating point for any given speed to a lower temperature because the controller will think it's warmer than it is. --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/ Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/ +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org. Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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