In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote: Vic: [u]Always[/u] download the data sheet for any chip you're using. I believe on the ULN the COM pin is across from the ground pin and you may in fact have it mis-marked as 12v but do not rely on my memory. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=316839#m316926 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2009 (http://www.dotNetBB.com)