On Fri, 20 Jan 2012 14:47:44 -0500, Carl Denk wrote: :: I see it as the coil is held in in either position, I see it differently (black for active confused me momentarily), for AC the= =20 positive half of the wave form causes a positve rectified half wave which=20 switches the coil to the On position and a negative going half wave=20 rectification causes it to move to the OFF position. For DC a positive pulse switches on, and a negative going pulse switches=20 off. Or indeed just swap the terminals around. Colin -- cdb, colin@btech-online.co.uk on 21/01/2012 =20 Web presence: www.btech-online.co.uk =20 =20 Hosted by: www.justhost.com.au =20 =20 This email is to be considered private if addressed to a named individual= =20 or Personnel Department, and public if addressed to a blog, forum or news= =20 article. =20 =20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .