This is a multi-part message in MIME format. ------=_NextPart_000_00A8_01C40CE7.78B011C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Andre, I use this circuit when I need a really bright display. Refresh rate is ~200Hz. It can consume up to 350mA (but is very visible). By using further outputs of the 4017 it can be extended to 10. Note optional decimal points and blanking Data is presented in ABCD (ie a nybble) form to the 4543 buss and the digit selected. This could be reduced to just 2 pins for 10 digits, or more if 4017's are daisy-chained, by a) using an RC filter on the 4017's Clock/Reset so that a long pulse resets it, a short one clocks it. Or simply clock through unimplemented digits and forget Reset b) using a parallel-serial shift register for the data Straying a little from your original question but it's an alternative -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! 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