[sdiy] DR110 repaired, possible trigger ins?

[Rude 66]

yes, i thought it'd be easier too..this thing is a chassis with 2 large
boards totally full of caps, resistors and transistors. problem is the
enormous number of wires (that old style cotton-like stuff) that link them
and the knobs, leaving no room to see anything. one is probably the rhythm
board and one the voices board, but there are no markings whatsoever on it
anywhere. i've tried to locate the schematics, but to no avail so far, there
isn't much web info on it to begin with...

thanks!

r./




----- Original Message -----
From: "Metrophage" <c0r3dump23 at yahoo.com>
To: "Rude 66" <r.lekx at chello.nl>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, May 04, 2004 3:19 PM
Subject: Re: [sdiy] DR110 repaired, possible trigger ins?


> --- Rude 66 <r.lekx at chello.nl> wrote:
> > this is no 606: it's the size of an old radio.
>
> If anything, being large probably makes your task easier! The
> portability of a 606 or DR110 can be neat, but sometimes its impossible
> to fit a certain modification you want to do within the small case.
>
> Most of the older drum machines are probably transistor twin-t filters
> and noise sources. Of course some also include extra circuits for
> generating weird beats.
>
> With most analog drum circuits, a pulse of 5v or so goes through the
> transistors in certain parts, and makes them ring within certain
> frequencies. Like a mini resonant filter. Add some back-biased
> transistor noise, maybe a little tone control, and there's your drums!
>
> I'd just try to find what looks like the beginning of each voice, and
> apply triggers while listening for output. The S-trigger circuit might
> work with the switches. Doesn't hurt to have a circuit which you know
> makes a clean trigger, so you know the voltage and duration. Really
> though, most analog circuits are not too picky. You might even be able
> to ring those twin-ts with entire drum sounds from another machine and
> they'll sound wild
> CJ
>
>
>
>
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