Dnigrin Posted August 12, 2010 Report Share Posted August 12, 2010 I'm new to Midibox. I would like to build a simple, self contained box that will filter out active sensing MIDI info, and pass everything else. Ideally, I would like this box to not require power. Is this possible with Midibox? It seems that the core32 is overkill for what I want to do. I'm also unclear if I would have to power it via USB or something. Thanks for any tips or ideas. Quote Link to comment Share on other sites More sharing options...
Altitude Posted August 13, 2010 Report Share Posted August 13, 2010 (edited) Sounds like a job for the good ol midifilter! http://ucapps.de/midifilter_16f.html. You can run this on batteries but the pic16 will probably be too much for bus power (but dont quote me on that!) Edited August 13, 2010 by Altitude Quote Link to comment Share on other sites More sharing options...
Dnigrin Posted August 13, 2010 Author Report Share Posted August 13, 2010 Hi Altitude - nice to see you here too! That *is* quite close to what I'm looking for. Programming in assembly is something I could do without, but it looks like I may be able to squeak by with the examples given. But the bus power is what I'm after, ideally. Anyone know if that's possible? Also - since you are dealing with a total midibox newb here - do I have to get the core PCB board and all of its components as well, or can I just get the PIC and connect power and my MIDI connector I/O to a few of its pins to do the job? Quote Link to comment Share on other sites More sharing options...
nILS Posted August 14, 2010 Report Share Posted August 14, 2010 You can easily run a core module off USB power. If there's not purrty LEDs or LCDs the MIDIbox pulls next to no current. You don't need a full core module for that - most of the board is just headers anyway. This shows the mininum requirements for a the midi filter. If you don't feel like writing asm, you can always replace the PIC with one that supports MIOS (18F452, 18F4685, ..) and write the app in C using the MIOS skeleton. Then it's really just a matter of ~20 lines of code. Quote Link to comment Share on other sites More sharing options...
Dnigrin Posted August 14, 2010 Author Report Share Posted August 14, 2010 Thanks Nils, exactly the info I needed! Last question - if I *do* decide to go the battery route, since I'm also pretty clueless with electronics (though I can build things from a circuit diagram quite well), can someone point me to the circuit I would need to build to convert a 9v battery output to the required +5V? Quote Link to comment Share on other sites More sharing options...
nILS Posted August 14, 2010 Report Share Posted August 14, 2010 You can simply lift the PSU part of the core module (schem on ucapps.de). You can leave out the bypass caps, if you want to, as a battery is pretty much as stable as it gets: 9V - 7805 - 5V Quote Link to comment Share on other sites More sharing options...
Dnigrin Posted August 14, 2010 Author Report Share Posted August 14, 2010 Thanks again Nils! Quote Link to comment Share on other sites More sharing options...
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