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Circuit for an audio crosspoint matrix help

Former Member

I'm new here, looking to make a 30x30 audio matrix using 2 x AD75019. I did my electronics course back in the 80's so much forgotten! I need to be able to switch 30 unbalanced o/p sources to any or all of 30 unbalanced i/ps.  Would like to find a circuit diagram to suit.  Thanks.

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  • 0 in reply to Robert Peter Oakes

    Thanks  for responding.  I'm now  not sure this matrix will do the job as some of the signals are dc control voltages.  Assuming this ic is ac coupled .(I'm trying to adapt an old analogue synth)

  • 0 in reply to Former Member

    What makes you think it is AC coupled, from what I can see it is not.

     

    It does have a switch resistance of about 150 Ohms but as long as you not trying to pass power signals that should be ok. There also able to handle upto +-12V if that is what you supply the chip with

     

    the issue i see is trying to go from 16x16 to 32x32 is a lot of cross wiring, even for a synth. many of the synth systems I have seen in the past have a lot of inputs tracking down to a few internal channels / tracks so a 32x16 (2 Chips) would be more than enough.

     

    You also need to remember these are not isolated from each other so if you connect 3 inputs all to the same output they are effectivly shorted together by a 300R resistor (150R switch resistance). this needs to be considered in your design