Nice write-up on using the L293D

L293D is a common motor controller chip.  The author built a nice circuit for the chip and gives nice directions on it.

http://www.electronics-lab.com/projects/motor_light/027/index.html

http://makezine.com/2013/11/14/making-a-dc-motor-driver-with-a-l293d/?utm_source=feedburner&utm_medium=%24%7Bfeed%7D&utm_campaign=Feed%3A+%24%7Bmakezineonline%7D+%28%24%7BMAKE%7D%29&utm_content=%24%7BGoogleReader%7D