![]() For my needs, this was fine 99% of the time, which is why I never bothered to add a memory function, which wouldn't have been all that difficult to do.Įssentially, the 74LS150 can select one of sixteen inputs, based on BCD inputs, and output the selected input, inverted, to "W" which drives the midi out port though a few resistors. There was no memory aspect, so every time you powered it on all of the outputs "tapped" midi input one. again, its not a complete schematic, but the building blocks of what I made. 64 ins, 64 outs.Īnd here is the digital version. I sold it to a friend years ago once i acquired a plethora of emagic midi interfaces for my PC, as I can use them as both switch matrixes (routers) or in/outs on the PC depending what I'm doing at the time. This is my own design, but probably bits of it were stolen from somewhere, I'm sure. While the schematic is drawn with two inputs and two outputs, I actually built one of these with sixteen in and sixteen out, simply duplicating the parts as much as necessary, and using 16 position rotary switches instead of simple DPDT. If you can solder, you can make one of these. Then wire those jacks to standard 5-pin DIN plugs, using shielded two conductor microphone cable (shield to the center pin on the jack, but not the plug, red to the left pin next to the center, white to the right pin next to the center) and plug that into either of the above units. Either of the above units (which I have, and found them quite useful over the years) will do the trick, and you can take a 1U blank panel, drill a bunch of holes in them, and install standard female 5-pin chassis mount connectors you can acquire from Radio Shack, Digikey, Allied Electronics or Mouser, just to name a few.
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