[sdiy] DIN SYNC output stage

[Dave Kendall]

Hi all.

I just finished a hardware MIDI CLOCK to pulse decoder design, and some 
of the guys on electro-music have been interested in adding a DIN SYNC 
(24PPQN) output to it.

My google fu has failed, but I'd like to be able to draw up and post a 
schematic of an output circuit to add on to the +5V CMOS outputs of the 
decoder.  I'm guessing the +5V pulses are simply buffered, or maybe 
not?..... There may also be output impedance issues to get right. I've 
found some partial information, like on the Blacet MIDI-SYNC datasheet, 
but am unclear as to polarity of the outputs, and whether they are 
latched high/low, or are simply low- to high pulses.

Can anyone steer me towards a schematic and info on a typical DIN SYNC 
output stage?

Any help appreciated.

cheers,
Dave