ULN2803 motor driver

[phillavery]

Hi

Is it possible to use a 2803 to bi-directionally drive a small motor. eg. pin1 high providing negative and pin 2 low providing the positive. Pin1 low and pin2 high puts it into reverse. A bit of a play suggests that the 2803 does not provide a negative when driven high.

The circuit is using a 14m combined with a 2803 to drive a small motor (draws about 300ma).

Any thoughts would be appreciated.

Cheers
Phil

 

[sghioto]

Phil,
The answer is no. The 2803 only provides a "sink" or low, output goes to ground or negative when the input is high. Does not provide a "source" or positive output when the input is low. Need to use a motor driver chip like the L293D.

Steve G.

 

[phillavery]

Thanks Steve

The lack of sourcing was what I was missing. Will use a L293 as you suggest

Phil