that's a very smart analog close-loop temperature control. Do you happen to know which company make these tools? Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.selfip.com ----- Original Message ---- From: Alan B. Pearce To: Microcontroller discussion list - Public. Sent: Thursday, April 3, 2008 9:55:33 AM Subject: Re: [EE] Tool Demagetizer >IIRC the "Curie Point" of a material is the temp at which ferromagnetic >properties go away... But the magnetism comes back when the temperature drops below the Curie point. A number of soldering irons control their tip temperature this way. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ____________________________________________________________________________________ You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist