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

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