Multiplexing circuit help

Discussion in 'General Electronics Chat' started by brobl, Mar 29, 2012.

  1. brobl

    Thread Starter New Member

    Mar 29, 2012
    Hey all,

    I'm trying to figure out a way to multiplex three circuits(12V, 0.5A MAX) using 2 LEDs from a DSP evaluation kit as the decoder bits. When the LEDs turn on, the voltage change is a little over 1V (2.5 - 3.6). I'm stumped as to what to do with these specifications. Any help would be appreciated. Thank you!

    btw, These three circuits are used to control fan speeds on a standard 12V fan.