NTC Temperature control muffin fan

320

05:56:59

Simple Temp control muffin fan.
Replace the variable resistor with a 5k NTC
And the 4k resistor can be from 2k to 4k
Give it a try if you need a automatic fan control.
Can be used for attic fan operation just add a relay,
And a couple other parts.
I use this for cooling the power supply transformer 
Of my ham gear.

published 2 years ago

hendr3k

10 months ago

The circuit has one disadvantage: if the temperature is in a range between 0 and the motor is rotating, then a constant current still flows which drops across the circuit.

hendr3k

10 months ago

This could possibly damage the fan if it were a small PC fan, it would be better to solve this with a diode to limit the switching point

hendr3k

10 months ago

Or you could use an operational amplifier to define a switching point at which the speed is controlled. But a diode would be an elegant, simple solution.

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