At 02:53 PM 6/19/02 -0400, Chris Loiacono wrote: >The 12.6V transformer output is rated with the primary at 230V. Now I am >considering using it on 277VAC. This should bring the input to the 7805 up >to about 120% of the 8.9V, 0r about 10.7V. Don't do that! I think that you will cook your transformer if you over-voltage the input that much. Core saturation. How much power do you need? We use several custom transformers for some of our products - one of those has 120V, 277V, 347V primary taps and supplies 20 Vac @ 4A. It mates with a little card that has a NS simple switcher that you could set to whatever voltage you wanted within the range of 5Vdc - 14Vdc. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 18 years of Engineering Innovation (1984 - 2002) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body