Simple temperature controlled fan regulator

Some time ago I pulled out temperature fan controller from one of old ATX PSU. With 12.2V input it provides 4.5V at 25°C and raises output voltage till 11.8V at ~70°C. After changing Q2 to higher voltage transistor and tuning of R4-R5 this divider this controller should be suitable for 12V fans with 24/36/48V input. […]

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