Quentin Harley wrote: > Ralf Mardorf wrote: >> I have 40 1N4148 diodes on stock and will take a look, if my >> swissonic USB device is using 220 ohm resistors and diodes or if they >> ignore this (assumed that I'm able to open the case without damaging >> anything). Btw. the USB MIDInterface isn't able to trigger every >> external MIDI device, it has less power. >> > > Replace the 1N4148 diodes with schotky diodes to see if this makes a > difference. traditional Si-Diodes like the 1N4148 has a substantial > voltage drop of around 0.6V > > My USB Edirol UM-1SX is serving me quite well. The company is owned > by Roland, and obviously drew some of the experiance from the stable. > I made quite a few MIDI recordings (with no apparent jitter), and I > also use it as the link to my digital mixer automation. > > Cheers, > Quentin
PS: By the way, the diode is parallel connected, not series-connected e.g. http://upload.wikimedia.org/wikipedia/de/thumb/5/53/StandardMIDIInterface.gif/672px-StandardMIDIInterface.gif (the 4049 can be any 74 4049 or a 7404 or ...), maybe the voltage loss isn't relevant, but for usage with TTLs (or CMOS similar to TTLs) there seems to be an advantage by using Shottkey's. _______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
