Hi David - I could'nt get the links to work, but did manage to run down a circuit by one of the fellows mentioned on the page you referenced. http://www.portabletubes.co.uk/sitefiles/ausbatt.htm Interesting stuff... Jack --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .