Automated SPDT/SPCO switch

Discussion in 'General Electronics Chat' started by CrimsonQuandary, Jun 16, 2009.

  1. CrimsonQuandary

    Thread Starter New Member

    Jun 16, 2009
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    I'm trying to make a circuit which acts as an automated SPDT switch, with a variable rate control (preferably from about once per two seconds to very very rapidly). It would take two passive signals and pan back and forth between them and send them to a single output.
    Much like an autopan circuit... which is very difficult for me to find any information on.
    I'd also like to set it up so each input signal has an LED indicating when it's activated, so there'd be two LEDs flashing at the same rate as the panning.
    I need it to run off of 9v DC
    Lastly, I'd like to be able to choose between a few different wave forms; like square, triangle, and saw.

    I've considered using relays, but they're too slow. I've read a bit on using ICs and/or transistors as switches, but I don't know much about them quite yet.

    So...
    Any takers?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. CrimsonQuandary

    Thread Starter New Member

    Jun 16, 2009
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    Those seem like they might do the trick.
    The websites aren't very informative though. I would begin to know if you could adjust any wave form with those.
    Perhaps another option?
     
    Last edited: Jun 16, 2009
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    You would need external circuitry to adjust waveforms. That is not usually a switch function - they just conduct or do not.
     
  5. CrimsonQuandary

    Thread Starter New Member

    Jun 16, 2009
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    Let's assume the analogue switch does the trick.
    That's one part of my dilemma solved. I still need some assistance on a few other matters.
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    Here you go:
    http://www.musicfromouterspace.com/analogsynth/STEREOPANNER/STEREOPANNER.html

    Video of the stereo panner kit in action: http://www.youtube.com/watch?v=u-FQ8ZpClzA

    MFOS homepage: http://www.musicfromouterspace.com/index.php?page=HOME

    This does much of what you want to do (triangle, sawtooth panning at an adjustable frequency/depth) and it's already designed and de-bugged. It says +12v/-12v on the schematic, but you could very likely get by with two 9v batteries.

    However, they're currently out of PCB's.

    It is not a beginner's project.
     
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