Do I want to make a rheobus but I don't get the rheostatos, do I want then to make it with potentiometer, does somebody know that potentiometer can use? Do I believe that with one of 1200ohm it serves me, some help?
im pretty sure rheostats are just potentiometers that can handle the kind of high power being used in fans, a standard potentiometer will generally die a smokey death when used in high power situations as fans use around 1.5 watts and a potentiometer from maplins can handle 0.4 watts. when you say u dont get rheostats do u mean you can't get hold of them or don't understand them, cause if u can't get them i recomend making an electro bus or even better use pulse width modulation
Welcome, Carlos, for the simplest fan controller you would need a rheostat or potentiometer of around 50 ohms resistance and about 3W rating. The high value potentiometers (like your 1200 ohm one) won't carry the fan current, as Shuriken says. If you can't find one, you could build an electronic controller, either one of the circuits in the links from Shuriken and whypick1 or there are some more here.
ok, but my question is if I can substitute the rheostats for potentiometer in this plane: http://www.bit-tech.net/images/article/52/fanbus_rheostat_switched_dual_LED.jpg Can I place the potentiometer of 1200ohm where the rheostats goes?? do they understand me?
If your potentiometer is 1200 ohms, the answer is no, won't work. That circuit uses 50 or 25 ohm potentiometers. Even a 1200 ohm 3W wouldn't work - it can only carry 50mA and most fans take over 100mA.
