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This is an easy to build and smart cooling fan circuit, the smart means that this fan will start automatically when the temperature rises above a set level.
To function this circuit as intended, place the NTC (thermister) near a device that is getting hot (eg.on an audio IC) so this fan does’t need to operate always.
Use a 12V 200ma or 100ma fan.
Check the polarity of the fan when it connect to this circuit
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