[sdiy] midi clock

[Karl Ekdahl]

While we're at the subject of midi stuff the hardware
way... 

I'm quite inexperienced with electronics and i have a
HUGE amount of old 74xx, 40xx and 6402:s laying
around. I was thinking, would it be hard to do a
circuit that would take midi in NOTE ON and NOTE OFF
messages and translate it to a 8-line address note
out, 1-line note on/off and 4-line address channel
out?

thanks

/Karl

 --- Seb Francis <seb at is-uk.com> skrev: >
pfperry at melbpc.org.au wrote:
> 
> > > > detecting any given MIDI byte. Both use a UART
> chip (6402) which seems
> > > > to simplify things considerably.
> > >
> > Well as a non-programmer I am naturally
> sympathetic to the 6402, but unless you salvage one
> from a very old modem or compter, a PIC costs
> less... also, some of  those Penfold circuits might
> be making heroic assumptions regarding the MIDI
> signal beig pretty clean, no sysex etc.
> 
> I would agree here.  After reading that Penfold
> book, I built a MIDI to 16x drum trigger + 8x gate
> interface based on a 6402 and discreet logic.  It
> ended up being a very big circuit which could easily
> have been done using a PIC and minimal external
> components.  At the time though, I was very
> inexperienced with electronics, and having to learn
> all about PICs at the same time as trying to learn
> electronics would have been too much.  The whole
> project was definitely a worthwhile learning
> exercise if nothing else :)
> 
> And (just like pretty much all of the Penfold
> circuits) the logic I used will not handle all MIDI
> eventualities properly.  Having said that, it seems
> to work pretty well, as long as I set my sequencer
> to send the right type of note off messages!
> 
> Seb
> 
> P.S. If anyone actually wants a 6402 chip (they're
> pretty hard to find nowadays), I have a couple of
> spares kicking around which I would sell.
> 
>  

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