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Why Do Computer Fans Have 3 Wires. Thus instead of using the colors to distinguish the function better try to study the internal wiring connection. A 4-pin fan uses its first three wires the same way a 3-pin fan does.
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This is still considered a 3 pin fan. This is all the fan really needs to operate. A 4-wire CPU motherboard fan is a standard brushless dc BLDC fan but has four wires extending from the casing.
And because some of these chargers are actually both barrel and center pin making them have 3 conductors.
3 wire pixels have wires for positive negative and data. With this type fan speed is typically controlled by increasing or decreasing the voltage over the power wire. Computer fans commonly come in standard sizes such as 120 mm. Each of these wires serves a specific purpose.