Good day to all Several years ago, we purchased the assets of a LED clock=20 manufacturer in our town. We wound up with several hundred 4-digit=20 red LED displays used for clocks installed in schools and=20 hospitals. Part number SK-2545D-24 Nice displays: digits are about 2-3/8" tall and=20 decently-bright. That's the good. The bad is that these are=20 direct-drive displays: no multiplexing **AND** they are=20 common-cathode. This last really sucks. These are RED displays. Each segment has 3- red LEDs in series, the=20 other dots are all single LED, including two individual LEDs for the colon. So: I'm looking for recommendations for a high-side LED display=20 driver chip. I need something like 35 channels, preferably with=20 constant-current output. The segments having three LEDs means that=20 the driver needs to operate from at least 10 Vdc, preferably 12=20 Vdc. Assume around 20mA or less per LED or LED group. Serial SPI=20 preferred but would accept I2C if that was the only option. Idea is to make a driver board for these displays that also holds a=20 PIC and power supply. We can then either use these displays / driver=20 board for our own projects or flog them to willing buyers. I'd ask on electronics.stackexchange.com but product recommendations=20 are specifically prohibited on that site. Any suggestions greatly appreciated. Many thanks! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA 780-489-3199 voice 780-487-6397 fax 888-489-3199 Toll Free www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .