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Multiplexing circuit

Discussion in 'General Electronics Discussion' started by brobl, Mar 30, 2012.

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  1. brobl


    Mar 30, 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.
    Last edited: Mar 30, 2012
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Sorry, this is rather unclear. Can you explain in more detail?
    I wouldn't know how to use LEDs for decoding. Normally they are used as indicator lights. Also what exactly do you want to multiplex? Are there 3 supplies which are multiplexed onto one fa, or are there trhee fans multiplexed onto one supply?
    Maybe multiplexing isn't what you want at all ( describes whar we understand as multiplexing, it may not be what you desire).

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