Having problems with sequential logic

Discussion in 'General Electronics Chat' started by dpresley58, Nov 2, 2010.

  1. dpresley58

    Thread Starter New Member

    Sep 1, 2009
    7
    0
    Hi,
    I'm trying to build a switching circuit that would sequentially select one of three audio inputs and route it to the ouput. Is there a cookbook approach to this, or possibly a chip that already implements it?

    Thanks in advance.
     
  2. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
    The easiest way would be to use a 1P3T (one-pole, three throw) rotary switch. Each switch position is wired to an individual input, and the pole goes to the common output.

    If this is too easy for you, then try looking up an analog mux such as the Maxim DG408 or DG409 (Analog Devices ADG or AD408/409) -- as long as the voltages you are switching are within their operating range.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    There are audio CMOS multiplex switches that can do it, but you need to have small signal levels to work with it.

    CD4052
     
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