On Fri, 3 Nov 2006 22:39:55 +0100, Christian Mahr wrote: > Some more technical explanation I found here: > > http://www.analog.com/library/analogDialogue/archives/38-02/fan_speed.html Nice article, I've added a link to it to our "userful addresses" page. > So this type of pwm control is completely useless for a 3 pin fan > which expects modulated 12-V-power, unless.... > > What might be possible is to use some external circuitry to > translate the 0..5V logic signal into a pwm-modulation of the > +12V supply, i.e. a power switch. > > > Before I start experimenting in hardware, just my question: > - did anybody find already a ready-made-solution for this > kind of adapation circuitry? > - if not: Is there any suitable IC known which does all in one > (otherwise I might need at least 4 resistors and 2 transistors...) Why don't you simply use 4-wire fans if that's what the board was designed for? -- Jean Delvare
