SV: RE: [sdiy] LM566, SAD1024 and a Paia String synthesizer

[Karl Ekdahl]

Tim

> If that is the Stringz 'n' Things (1550) I built one
> of the those many years
> ago.  The one thing I remember is that about 10 of
> the electolytic
> capacitors were bad right out of the box. If I

Ouch, yeah i was almost thinking it was something like
that. I'm gonna desolder the rest of 566's and try
them on a breadboard.

> recall there was no sound at
> all on the notes connected with these capacitors. 
> Once I changed the caps
> out it worked fine.  If I were you I would change
> ALL of the electrolytics
> in the thing.  I have schematics for the unit that I
> can scan if you need
> them.  Does the top octave chip (MK50240) work?

I do got the schematic, thanks though! Everything
works except the chorus and one of the keys is a
little funky, looking closer on the board someone's
already replaced two of the caps on that notes section
so you're probably right...

I'm still thinking that i could totally diss the whole
internal SAD-driver and just do something simpler
myself, i don't really understand the complexity of
the 566's - in my mind one should be enough, why four?

Karl


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