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How to Undervolt a Fan Inside a Small Device?
I would like to know the way to reduce the speed of a fan inside a
small device in order to cut down the noise from the fan. If I understand this correctly, I am supposed to do this by undervolting the fan from 12-volt it is now to something like 6-volt using some kind of "inline resistor" or someting. I can soldering wires together. But I really don't know much about resistor and such. I am hoping someone can give me the "exact" information about the way to do this. The small device is a LinkSys gigabit switch that has a very noisy 40mm fan in it. I have replaced it with a slightly quieter Papst 60mm fan. My intention is to oversize the fan and then reduce the fan speed; then I will be able to maintain the same air flow as the 40mm fan but with less noise. Now, I have the oversized fan mounted inside the gigabit switch. And I can feel that its air flow is definitely stronger than the 40mm fan. This means I can go ahead to reduce its speed without worrying about the possibility of not getting enough air flow. I need to figure out how to reduce its speed. My questions a - I am under the impression that I should use something called an "inline resistor". Is it the right product? - Because the gigabit switch has very limit space inside, the "inline resistor" must be small enough to fit inside. Will it be small enough? - The fan is rated as 12V and 0.6 watt with two wires. What type of "inline resistor" should I use? I am under the impression that inline resistor is rated by "ohms". Can someone give me a RadioShack product-number or something like that? - Which wire should I solder the inline resistor to the fan? Red-wire or the blue-wire of the fan? - Does this matter which way I orient the inline resistor? Thanks in advance for any information. Jay Chan |
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