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Old 18th February, 2005, 02:39 PM
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Thermal Fan Control and Power Tap

I built this from a circuit I found on www.heatsink-guide.com. It was originally just for a small circuit to thermally control the fans in your system to help reduce noise when the fans don’t need to run at full speed. This circuit worked awesome and is very good at controlling the speed of the fans and the temperatures dictate. I thought that adding a power tap to the thing would be a great idea and added 9 12 volt taps and 9 5 volt taps as well as 9 3.3 volt taps. I have also added some different features as well. The first being that you can run all this from your exsisting power supply or use your exsisting supply to trigger another atx power supply to power the fans and the "BLING". I have also made the adjustment pot accesable at the back of the comp in a pci slot mount. I have some room on the board and if anyone has any suggestions let me know and if anyone knows of a small 2 digit voltage display I would like to put one on the fan controll circuit so I can monitor the voltages

http://www.imagerely.com/imagehost/u...rol_labled.jpg
http://www.imagerely.com/imagehost/u...ontrol_top.jpg
http://www.imagerely.com/imagehost/u...rol_bottom.jpg
http://www.imagerely.com/imagehost/u...d_pci_slot.jpg
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Old 18th February, 2005, 03:13 PM
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Triggering another ATX power supply is fairly simple. Just wire the ground and power-on cables to the existing ATX connector.

For LED supplies, generally an individual resistor is used per LED to limit the current. This is because different LEDs have different forward voltages. Infrared and red LEDs generally have the lowest forward voltages, between 1.2V and 2V. Green can be as high as 2.4V, and Blue/White can be as high as 3.3V.

The reason for individual resistors is to ensure that each LED has the current it requires. If you have 4 red LEDs, and a couple of blue LEDs, you might find that the red LEDs drag the voltage down to the point where the blue LEDs do not light!
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Old 19th February, 2005, 06:25 AM
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Yes triggering a seperate supply is quite easy I agree but some of us dont wanna mess with the main power in their comps at all. This is done as a direct plug them in and they work.
Secondly I used a divider circuit to get my 3.3 volts and only 4 leds run from each set of resistors.

but thanks for the nice job anyway.
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MSI K8N Neo2 Platinum
AMD ATHLON 64 3500+ NEWCASTLE @ 2.60GHZ 260 mhz FSB
DIY SWAMP THING WATER COOLER
1024MB PC3200 DDR400 2.5 3 3 6 1T @ 432mhz
XFX 6600gt @ 600/1200
PCMARK04 : 5047 3DMark03 : 9813 3DMark01 SE :21374 Aquamark : 64909
Everest 1.51 MEM: READ: 6345 MB/S WRITE: 2575 MB/S Latency: 47.2 ns
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