Did you know you can use a Darlington 2003 or 2803 for an inverting level converter ? 5 to 30VDC input, 5 to 50 VDC output. All it takes is a 4.7K resistor from the output power to the collector pin. Sid Weaver W4EKQ Port Richey, FL -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu