Looking for 36 channel Switch/Demux - Analog

Discussion in 'General Electronics Chat' started by mfr, Jan 26, 2015.

  1. mfr

    Thread Starter New Member

    Apr 24, 2011
    19
    0
    Hi,

    I've been searching for hours, but can't find a 36 channel demux like the one in schematics attached.

    I need 5-20 volts out, 0.5-1 micro second resolution (for square wave pulses)

    Thanks for help !

    M
     
    • u2.jpg
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  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,061
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    You'll have to use multiple chips.
     
  3. mfr

    Thread Starter New Member

    Apr 24, 2011
    19
    0
    Thanks, such as? How to wire the address lines?

    All I need is a 144x144 matrix from an Arduino.

    Each point in the matrix has to be able to output square waves of peculiar formats, analog, 5-20v adjustable.
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,028
    3,238
    Can you adjust all the outputs to the same voltage at the same time?
     
    mfr likes this.
  5. Nykolas

    Member

    Aug 27, 2013
    87
    31
    Quote: All I need is a 144x144

    You seem to be looking for a cross-point switch, widely used in telecom and broadcast systems. Is this to be a single or multi-path switch? Do you need collision detection and priority? Uni- or bi-directional? The Mitel MT8808 is an 8x8 switch array that can be expanded. An 144x144 is huge and best be handled in a 3-stage approach, reducing costs and improving reliability. E
     
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  6. mfr

    Thread Starter New Member

    Apr 24, 2011
    19
    0
    Sure, no need for individual control. The pulse width and modulation will do the trick.

     
  7. mfr

    Thread Starter New Member

    Apr 24, 2011
    19
    0
    Hi,

    I will raster-scan the 144 point matrix. The size is not set in stone. It could be 10x10 for example. Could I use a DSP of sorts ?
    The idea is similar to an old TV. Scanning lines to produce an image.The reason for the raster is that I need to only fire one dot at a time (design constraint).
    Maybe a microcontroller that has 20 analog outputs or 20 digital (on/off) outputs that I could then turn to an adjustable gain analog signal could work.?
    Or two arduinos - one per axis?

    What do you guys think?

    I'm pretty good at programming, I don't mind, as long as I can get down to 0.5 to 1 micro-second pulses (square).

    I saw it done with four 6x6 matrixes adjacent to each other forming the larger 144 dot matrix. (4x 36x36)

    Thanks !!!

     
    Last edited: Jan 26, 2015
  8. mfr

    Thread Starter New Member

    Apr 24, 2011
    19
    0
    See the attached matrix.

    I can't teel how 2x6 wires can carry 4x 36 dot matrixes.
     
  9. mfr

    Thread Starter New Member

    Apr 24, 2011
    19
    0
    Another matrix
     
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