Try a TD62783 from Toshiba Digikey part number TD62783AP-ND the high side version of a ULN2003. Vern ----- Original Message ----- From: Peter Johansson To: Microcontroller discussion list - Public. Sent: Thursday, February 10, 2005 11:53 AM Subject: [PIC:] High-side drive for common-cathode LEDs (was: RGB Colormixing or randomization) > Jan-Erik Soderholm writes: > > > Right, diffused lenses look better for general "light-effects" projects. > > I currently have a few RGB 5mm LEDs I got from eBay, but they > > are common-cathode, which are harder to use with 5V logic and 12V > > power (to the LEDs). You need high-side switches. Better then > > with common-anode LEDs that you can switch on the low-side... > > This is something I've been wondering about. RGB LEDs are much more > common (and generally both brighter and cheaper as well) in common > cathode form, but I've found precious little in terms of high-side > drive control circuits, and certainly nothing remotely as standard as > the ULN2003 or 2N7000. Does anyone have any suggestions/ > recomendations for inexpensive high-side drive in the 20-100mA range? > > -p. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist