[sdiy] strange strange SAJ110 divider issue?
Bob Weigel
sounddoctorin at imt.net
Fri Sep 25 09:05:54 CEST 2009
I tested a whole bunch of SAJ110's in the crumar organ we just did.
They work perfectly in there. So ...I finally pulled the old solina
string ensemble back out. Put a tested chip in a socket I'd installed
that was on a problem chip location (number 4). The...same divider on
pin 11 is still garbled.
I can unhook the whole trace! Still..the..same garbled sound. I have
-10V instead of the -12V the diagram says should be there. However the
DOCS on the chip say absolute max rating is -11V there! It's smooth.
No ripple or fuzz visible on the scope.
All the other outputs seem to be working fine on that chip. Though
other dividers are also having problems. Very puzzling. Has anyone
ever seen a phenomena like this? I mean it's clearly dividers that work
in another machine so something about the power supply would seem the
logical first guess but is it possible there's something I'm not seeing
just causing one line to do that on every chip I put in there?? Cap
esr's seem fine. I even paralelled another cap just to be sure...-Bob
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