HELP with uln2003 stepper controller

I am going to be using a uln2003 to as a controller for a stepper motor, interfaced through a computers parallel port, here is a like to the website that I am using for instructions: http://colvins.ca/?p=11 here is a circuit layout:

This system can be used in place of an expensive stepper controller, the only problem is that the chip will only support up to 500ma, any more then this and the chip blows up.

My question is, would it be possible (possibly using ideal diodes) to supply the chip with a low amperage power supply and to supply the motors with a higher amperage using a separate power supply. Any words of wisdom or ideas would be great!!!

Thanks,

Joshua

Top Replies

Catwell over 13 years ago +2

Do you need to drive the stepper higher than 0.5A? If so, I would recommend a different setup. However, use the output of the ULN2003 to trigger external power for the stepper coils. ie: Mosfet or power…

0 Catwell over 13 years ago

Do you need to drive the stepper higher than 0.5A? If so, I would recommend a different setup.

However, use the output of the ULN2003 to trigger external power for the stepper coils. ie: Mosfet or power transistor
Invert logic and connect

Alternatively, you can use a L293DL293D to get 1A

Control lines come from the parallel port of the PC.

Cabe
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