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Originally Posted by pelle76
OT: About fans not starting at low voltages. By adding a capacitor to a simple Fancontroller circuit, the fan will get an extra boost at startup so that it starts spinning.
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For that sort of circuit you'd want a higher rated transistor. The BC337 is only rated at 625mW, while even a relatively small 80mm fan can pull up to about 1W. Also the transistor would probably need a small heatsink.
If low speed running is desired you also might want to look into PWM fan controllers, as that allows the motor to run at much lower speeds with high torque. PWM does tend to make motors run relatively hot and it can make them buzz.