[sdiy] Possible MIDI interface powered by MIDI driving device...

Jean-Pierre Desrochers jpdesroc at oricom.ca
Thu Mar 24 20:01:18 CET 2016


Dave,

> I use this for a variety of reasons, but one of which is filtering out
> Active Sensing and Timing Clock.
The same for me, I need to filter out the Active Sensing 'FE' code.

> All you have to do in the code is strip out the commands that echo the 
> byte to
> the output.
That's exactly what my code does..
Thanks anyway for your nice comment.

JP

*******************************************************

Le 2016-03-24 14:47, Dave Brown a écrit :
> I did my own AVR design of a MIDI processor powered by the MIDI device.
> Details, including code, are at
> http://modularsynthesis.com/processor/processor.htm
> 
> I use this for a variety of reasons, but one of which is filtering out
> Active Sensing and Timing Clock.  Note that power stealing isn't 
> supported
> by the MIDI standard and people on this list have criticized me for 
> doing
> so, but it works quite well on a number of different synths.  Unlike 
> what
> you posted, I went with an unregulated supply and a crystal for the AVR 
> so
> the timing would be accurate.  I found that combination worked better.  
> All
> you have to do in the code is strip out the commands that echo the byte 
> to
> the output.  You can strip the transpose and stuff also or just 
> hardwire the
> pins.
> 
> Borrow away ...
> 
> Dave
> 
>> -----Original Message-----
>> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf 
>> Of
>> Jean-Pierre Desrochers
>> Sent: Thursday, March 24, 2016 11:13 AM
>> To: Synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] Possible MIDI interface powered by MIDI driving 
>> device...
>> 
>> Here is a possible MIDI interface that would sink its power from a 
>> MIDI
>> driving device...
>> 
>> http://www.arcenson.com/public/MIDI_interface_power_steeler.JPG
>> 
>> ---> Assuming that the driving MIDI device (keyboard, sequencer, pedal
>> ---> board, etc..) is powered by internal +5VDC supply..
>> The CPU would have to sink its 5vdc thru the 220 resistor of the 
>> driving
>> device. Doable..
>> I also think that it could work since the CPU MIDI output would be
> 'opticaly'
>> linked with the final receiving MIDI device.
>> Both driving and receiving devices would avoid ground loops while a 
>> CPU
>> process is running between them..
>> 
>> A friend of mine asked for a simple 'MIDI active sensing code (FE)'
>> hardware filter working without a DC supply..
>> 
>> JP
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>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
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