Q: I bought the Thermo Control Enermax fan for his execellent noise CFM ratio. Anways, twisted so that the Enermax at top speed sensor, a diode case temp of 85C detect ! WTF?!?! My case would be on Fire for that kind of temps!
85C – RPM
65C 3100 – 2600 RPM
45C – RPM
25C 2100 – 1800 RPM
I heard by the removal of the sensor, the fan will spin at 3100RPM. Will it work? Need a confirmation please.
———————
ABIT KT7A
AMD Thunderbird 1200MHz AVIA no OC
256 MB CL3 Mircon PC133
PAL6035 w / Sunon 27CFM 34DBA
Enermax Thermo Control
Enermax 2×80mm CS A1QX-06-VB EG301P
Enermax Case (300W) power supply
Re:Like I said in my post above, Ben, using a small 50K ohm varistor lets you dial in any resistance(rpm) you want. At 50K in parallel with 11K the total resistance is 11.1K, at zero, the total is zero. Use a multi-turn one intended for pcb mounting to get very fine control over the low speed setting. The current flow is extremely small, I'm sure, so $.59 at the shack should do it. Have fun.
Re:I belive that you can keep the thermo contol but change the power curve so that the fan spins faster at lower temps by adding another resistor in parallel with the thermistor.
The equation for total resistance in a parallel circuit is:
1/resistor1 + 1/resistor2 = 1/total resistance
So say hypothetically, the thermistor varries between 5 and 15 ohms, and you splice a 10 ohm resistor in parallel to the curcuit. The total resistance when the thermistor is 5 ohms is then:
1/5 + 1/10 = 3/10
The total resistance is then 10/3, or 3.333 ohms, which of course, is less than 5.
At 15 ohms:
1/15 + 1/10 = 1/6
The total resistance is then 6 ohms, which is much less than 15.
I may be wrong, but according to the math, this is how it should work. You would just have to figure out how big a resistor to add. If the resistor is too big, it wont do anything. If it is too small, you wont get as much effect out of the thermistor. I have never actually tried this but I have one of these fans and will probably try it if I can figure out what how big a resistor I need. Can anyone confirm that this works?
Re:Optimistic wrote:
"I heard by cutting off the sensor, the fan will spin at 3100RPM. Will it work? Need a confirmation please."
Yes, but you've got to tie the 2 white leads together. I didn't solder, just twist and either use a cap or some electrical tape. These aren't exactly high voltage or high current devices 
Re:take a look at this:Hal-Tech (http://home.socal.rr.com/haltech2001/)
Re:That particular fan has a sensor that exhibits 11K ohm at room temp.
Re:From my own experience with their temp controlled psu fans, I would say that shorting the leads together would give max rpm. It uses a thermistor sensor, the resistance goes down as the temp goes up. Go ahead and play around with it, I doubt it can be damaged just fooling with the sensor wires. Wiring a small 50K potentiometer in parallel with the sensor would allow for adjustable higher speed at ambient while maintaining temp controlled variable speed.
Re:yep here (http://{$MySite}/messageview.cfm?catid=40&threadid=436646&highlight _key=y)
0 Comments.