Fan Controller

Fan Controller

Fan Controller

This is a fan controller I worked on, based on the Temperature Controlled Fan I found online.

In this version, R1 is a 10K NTC thermistor (shown in schematic at 20C, which is 12.5k).  Adjust R2 for the turn on temperature and R4 for the full speed temperature.  Fan is a 12v PC fan that draws 0.11 amps.

Note that if you change R4 (full speed temp) you will need to re-adjust R2 (turn on temp).  Due to this behavior, I suggest using trim pots for R2 (5k trim) and R4 (500R trim) and adjusting R4 (full speed temp) first and then R2 (turn on temp).

*Note: I have not actually built this circuit, only played with it in LTSpice.

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