Need Circuit design to Switch Signal Line using Ardiuno

Discussion in 'General Electronics Chat' started by athulascc, Mar 11, 2015.

  1. athulascc

    Thread Starter Member

    Aug 15, 2014
    86
    1
    I have a signal line (assume MIC in , which has amplified)
    I need to send that signal to another device
    the passing or not passing depends on ardiuno output 1 & 0

    this pdf show my circuit but it is really should not work

    any Idea?
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    why not use a quad bilateral switch chip?
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,000
    3,229
    Does the signal go negative below ground?
     
  4. Reloadron

    Active Member

    Jan 15, 2015
    963
    232
    For audio switching you could consider, as was mentioned, a quad switch that will allow signals that go negative. The LF13201 might work for you.

    Ron
     
  5. athulascc

    Thread Starter Member

    Aug 15, 2014
    86
    1
    isnt there any circuit that do same thing other than this chip. i cant buy this here. or is my circuit correct? if i can use mosfet for this how?
     
  6. Reloadron

    Active Member

    Jan 15, 2015
    963
    232
    Go back and read post #3. Your audio signal will go above and below 0 volts. The circuit you posted will not work for this. If you want to switch audio read this link. Doing what you want to do while not complicated is not a simple as a single NPN transistor. Depending on your audio you could also likely use a small relay card like this one. The end result is No, your circuit won't work. You can build a circuit like what I linked to, you can use a switch like those linked to earlier or you can use a relay like I linked to. Those are your options.

    Ron
     
  7. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    why not capacitor couple the signal? then you wouldnt need to worry about polarization. I have used bilateral switches to switch audio and video on several different projects, and they worked fine. also eliminates the pop you get when relay switching.
     
  8. Reloadron

    Active Member

    Jan 15, 2015
    963
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    Capacitor coupling will work fine and is used in a few of the circuits I linked to.

    Ron
     
  9. athulascc

    Thread Starter Member

    Aug 15, 2014
    86
    1
    ok.
    if signal is coming from 3.3v logic control from a walkie takie. it is set high coming from the walkie talkie.

    in this case i think signal is not going into the negative.
    so that what chip or circuit you suggest.

    cheap single switch ic is best. but no problem other type.

    tell me how to google to find that kind of ic. what is the comman name for them.
     
  10. Reloadron

    Active Member

    Jan 15, 2015
    963
    232
  11. athulascc

    Thread Starter Member

    Aug 15, 2014
    86
    1
    if it is analog then only AND gate is enough for switching?
    is it good way to do
    or should I use try state buffer?
    which one is best
     
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