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MIDI input router (MIDI patchbay sort of)
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electrospeaker



Joined: Jun 30, 2006
Posts: 20

PostPosted: Mon Apr 21, 2014 8:29 pm    Post subject: MIDI input router (MIDI patchbay sort of)
Subject description: Need help converting mechanical switch to electronic switch
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I've previously built a simple mechanical MIDI input switch using a two-pole rotary switch (see schematic below). With several hardware MIDI devices I would be able to select which of the devices' OUT should go to the computer's IN for sysex dumps instead of unplugging cables.

But now I need more inputs (around 16 to 20) and would like to have an electronic switch (a pushbutton to advance to the next input) as well.
LEDs should indicate which input is in use and flash whenever MIDI data is passed through.

I could however need some help in actually designing the schematic. According to my web search results It seems I need to use "multiplexer" ICs (74LS251, 74LS150 etc.) in order to route the MIDI inputs and probably an additional circuit to do the actual switching from the push-button switch).
I don't know about the LEDs showing which port is in use. but for the MIDI activity flashing I suppose I could somehow "tap" into each MIDI port for that.

Can someone point me to a suitable schematic for the above?


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DUBmatze



Joined: Feb 18, 2013
Posts: 113
Location: south Germaica (schwabilon)

PostPosted: Wed Apr 23, 2014 4:30 am    Post subject: Re: MIDI input router (MIDI patchbay sort of)
Subject description: Need help converting mechanical switch to electronic switch
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electrospeaker wrote:
Can someone point me to a suitable schematic for the above?
not realy but check this...
http://m.bareille.free.fr/mpb3/mpb3.html

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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electrospeaker



Joined: Jun 30, 2006
Posts: 20

PostPosted: Sat Apr 26, 2014 3:31 am    Post subject: Reply with quote  Mark this post and the followings unread

That's pretty cool!
A bit too complex for my understanding, but the schematic gave me an idea that instead of just one "next MIDI port" switch selector I could have two switches (increment/decrement).

From my understanding the 4510 ("CMOS presetable up/down counter") can be used for this, which in turn controls the 4051 ("8 channel analog multiplexer/demultiplexer") to route the MIDI ports' data lines.


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