Hi Ashley, I got it figured out, It seem that at the end of my step sequence the 2 coils are still energized, so I added a line of code to turn them off. That seem to work now. Thank You, -- Cheers, Terence Ang On 2/25/02 10:29 AM, "Ashley Roll" wrote: > Hi Terence, > > Your probably pushing the power dissipation of the transistors a bit much ;) > > I've used a uln2803 and super glued a heat sink onto it before.. Works well, > not something I'd do in a commercial project, but at the time it was all I > could do. > > However it may be a better idea to use discreet transistors or MOSFETs. > There are also dedicated driver chips designed for stepper motors that may > be useful. > > Cheers, > Ash. > > --- > Ashley Roll > Digital Nemesis Pty Ltd > www.digitalnemesis.com > Mobile: +61 (0)417 705 718 > > > > >> -----Original Message----- >> From: pic microcontroller discussion list >> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Terence Ang >> Sent: Monday, 25 February 2002 12:16 PM >> To: PICLIST@MITVMA.MIT.EDU >> Subject: [EE]: ULN2003 Driver Running Hot >> >> >> Hi all, >> >> I have a uln2003 interfaced to a Stepper motor and controlled by a >> 16F84a, the temperature of the uln2003 seem to be very hot. >> Is it normal?? >> >> Thanks, >> Terence > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body