ReDesign of MIDI->Sync converter,
22nd August 1995
(Usual copying restrictions apply of course, please let me know when you
use this circuit)
The main differences between the new and the old are:
1. `New Improved Clock Circuitry'. The UART clock is generated directly
using a 500kHz ceramic resonator based circuit instead of dividing down
a 4MHz signal. This has reduced component count, and also made the clock
circuitry less difficult to get going. This is thanks to Ingolf Pohl
(Ing@korona.toppoint.de) who, along with a few others, replied to my
plea for help on sci.electronics. Thanks Ingolf!
2. `Manual Run/Stop selection.' The original circuit detected MIDI
`start' messages, passing them on to the synced device in the form of
the run/stop signal. I found that this was not always reliable (in my
studio setup) so have simply implemented a run/stop switch. In my
limited testing of the circuit, I have found this to be far more useful
than the previous method, since it allows the synced-device to be
started and stopped independently of the MIDI instruments - really good
for bringing drums in and out (it's quite interesting to bring things in
`out of sync' to really confuse the dancefloor... ;)
That's about it. The actual schematic is much clearer than the old one,
so I hope that there will be no confusion....
Personally I prefer the new version (but then I would say that) since it
gives another performance interface (another switch to play with!!)
Anyway, any problems, give me an e-mail.
john..
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