Abstract: This application note presents a technique that allows you to mix LED quantities and types, and requires just one power-supply voltage. Maxim > Design support > App notes > Amplifier and Comparator Circuits > APP 1862 Maxim > Design support > App notes > Display Drivers > APP 1862 Maxim > Design support > App notes > Power-Supply Circuits > APP 1862 Keywords: WLED, White LED, active ballast, current mirror, LED, boost, LED driver, transistor Jan 24, 2003 APPLICATION NOTE 1862 Circuit Drives Mixed Types and Quantities of LEDs Abstract: This application note presents a technique that allows you to mix LED quantities and types, and requires just one power- supply voltage. A similar version of this article appeared in the October 3, 2002 issue of EDN magazine. Portable systems often use LEDs of differe……