this a circuit based on the op amp ic 741. this circuit can be used for cooler fans inside pc or an amplifier.it will reduce the unwanted usage of the cooler fans. parts list 1 x LM741 IC 2 x IC base (holder) 1 x 10k thermistor 2 x 10K resistor(brown black orange) 1 x 1k resistor(brow...By: sooraj619
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Source: http://www.instructables.com/id/Heat-activated-cooler-fan/
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