Hi, It's a one-off, actually more like 4, as my PC has 4 fans:) RScomponents sells them in packages of 4, that was the only source here that was able to provide them at all, without shipping charges higher than those chips are worth. I tested /fault by stalling a fan, and also by disconnecting it. Changed sensor resistor value, no response. As for now, I will build them "as is" since temperature control more-or-less works. This is not quite mission-critical use, so I can live without those alert signals for now. Quite strange anyway, as I would not buy special IC's just for plain temp control. Turned out like this:) https://www.dropbox.com/sh/safxv4y0b6dsqgq/fKA-VwQQCW/fan_control#f:2013-04= -11%2022.51.36.jpg On Fri, Apr 12, 2013 at 12:38 AM, YES NOPE9 wrote: > KPL > Is this a one off ? Or are you doing many ? > Did you test the /FAULT output by stalling the fan ? > I am grabbing a sample now to take a look at it. > Gus >> >> Hi, distributed brains. >> >> Has anybody used microchip's TC652 fan controller? That seemed like a >> very simple/safe way to slow down fans of my PC, but somehow I can not >> get it to work as intended. Circuit is just like the one described in >> TC652 demo board users guide. >> Fan is running, but fan fault detection does not work at all, and >> temperature control seems very erratic. >> Circuit is very sensitive to my hand nearby it, even without touching it= .. >> 5V power comes from a cheap wall wart, which was good enough for all >> kinds of PIC circuits before. 12V for a fan comes from another wall >> wart. >> There is a big cap across the 5V power. >> >> Unfortunately I have no scope available now. >> >> Any ideas? >> >> -- >> KPL > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- KPL --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .