Automatic Cooling Fan Circuit

First posted in our old blog ziddique.WordPress.com

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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