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Originally Posted by TbirdX
Modded my MCP600 today with partial success. Followed the instructions above but for some reason my readings pulse all over the shop, from a low of about 800 to a high of 21000. Not quite sure why that should be.
The cable runs are long though....maybe as much as 1 to 1 and a half metres from the 2803 to the fan header, (external radbox), and the sensor cable runs up along that length with the 12v power cable. Not sure if it's picking up something there maybe? Or could it just be a simple dodgy chip? It's one I salvaged from an old piece of kit laying about our workshop.
I can use what I have for my intended purpose, (emergency shutdown in case of pump failure) but it would be nice to have it right.
Anyone with any ideas greatly appreciated.
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Try to get the 12v source directly from the motherboard Fan conector, I had a similar problem when I had the chip conected to a regular molex conector coming from the power suply, I hope It helps.