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12 volt power supply

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snakeplissken81

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I'am building a scale model spray booth. I'm using a 12 volt computer tower fan as an exhaust. Can someone help me with plans on creating a 120volt to 12volt 0.5 amp power supply for that fan? Thanks in advance.
 
those wall-wart transformers would work perfect, (usually used to power cordless phones and whatnot) They are pretty common.
 
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