TR-505 => TR-808?

[Rob]

I have been working on something exactly like this recently. It seems about
a butt-stupid thing to be able to do once you get the midi working. FAR
easier than a midi/cv converter plus you could get I think 12 seperate 5v
trigger outputs from ONE pic 16f84! WEll worth the 6 bux IMHO!!

Rob

----- Original Message -----
From: Steve Richardson <prefect at sidehack.sat.gweep.net>
To: Byron G. Jacquot <thescum at surfree.com>
Cc: <synth-diy at node12b53.a2000.nl>
Sent: Monday, June 05, 2000 7:52 PM
Subject: Re: TR-505 => TR-808?


> Byron G. Jacquot wrangled the electrons to say:
> > If you're happy with a less elegant solution (depending on your
definition
> > of elegant), you might be able to extract a trigger from one of the
audio
> > outputs with a comparator or schmitt-trigger.  (and if you could find a
626
> > or 707, they would work better for that, because you could steal a
single
> > voice's output for the trigger extraction.  With the 505, you're stuck
with
> > the stereo outs, I think).
>
> Slightly more elegant might be a small microprocessor that sniffs the
> MIDI output.  You can configure each pad on the 505 to a different
> channel and note number.  It would be quite simple to get a micro to
> trigger given a 'note on' message.  In fact, it would be interesting
> to ask whoever produces that OTP MIDI clock chip (which is just a PIC
> I believe) if they could do a quick version that produces trigger
> outputs.
>
> If you use a micro with enough on-chip I/O, you could probably produce
> 8 such trigger outputs in a tiny package.  You could build replicas of
> the original x0x circuits and run them all off of a 505..
>
> -S
> proud(?) 505 owner..
>
> --
>
>  Stephen S. Richardson                  The GweepCo Cooperative Network
>  prefect at gweep.net                      network access * technology
vulturing
>  http://www.gweep.net/~prefect/         http://www.gweep.net/
>