5600s construction manual

[Ken Stone]

The ETI/MAPLIN stuff works pretty well on 15v without modification in the
case of the modules that don't require the +/- 7v.  I imagine the remainder
would behave satifactarily with this slightly increased voltage too. 

+/-14v isn't so strange. my Roland SH5 runs off that as well.

Don't forget that these ETI circuits came out in the early to mid '70s, when
CMOS was fairly new. The SSS4416 CMOS analog switches are not so easy to
find, but easy enough to substitute for, with a little rewiring. Other
components used also reflect the vintage of the design. A lot of upgrading
can easilly be done to more modern components. As the design does not rely
on any exotic or impossible to get components, (apart from the SSS4416) it
makes quite a good DIY project. 

Mind you, the keyboard circuits of the Maplin version are begging to be
computerised, the diode matrix just has to go!


>I'm amused at all the excitement about the 5600.  I downloaded the 4600
>docs yesterday and saw how strange some of the circuits are in this synth.
>(7 and 14 volt rails? Huh?)
>
>The idea behind the transient generator is really good, combining an EG
>with a VCA to provide different types of responses.  Maybe there's a way to
>update this design to work with a more standard +/-15V.
>
>R>
_____________________________________________________________

                Ken Stone  sasami at blaze.net.au
                   ** Catgirl Paradise **
               <http://www.anime.net/~kens/>
         ** Australian Miniature Horses and ponies **
             <http://www.blaze.net.au/~sasami/>
_____________________________________________________________