Fan speed controller. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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In contrast to the scheme, which slows down the fan speed after the start (for a sure start of the fan), this scheme will increase the efficiency of the fan by increasing the speed when the sensor temperature rises. The circuit also reduces fan noise and extends fan life.
The setting is made before the temperature sensor is attached to the radiator. Rotating R1, we make the fan stop and then turning it in the opposite direction, we make it guaranteed to start when the thermistor is clamped between the fingers (36 degrees) If your fan sometimes does not start even with strong heat (bring a soldering iron), then you need to add the chain C1, R2. Then we set R1 so that the fan is guaranteed to start when voltage is applied to a cold power supply, and then, a few seconds after the capacitor is charged, the speed drops, but the fan does not stop completely. Now we fix the sensor and check how it all will turn during real work.
Rt - any thermistor with a negative TKE, for example, MMT1 with a nominal value of 10 - 30 kOhm. The thermistor is attached (glued) through a thin insulating gasket (preferably mica) to the radiator of high-voltage transistors (or to one of them).
Publication: cxem.net
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