Vintage Synth Repair

On Tuesday 01 January 2008 20:52, Mike de Vries wrote:
> I'm not too sure if you have the same problem that my EMU 6400 Ultra had,
> but the encoder in mine went a bit like that.. If i spun it left, it would
> often go right!
>
>   there is notes on fixing this, but basically, get 2x 1uf electrolytic
> caps and solder them between the encoder and ground. (A LPF filter to
> eleminate noise)
>
>   I did this to my Emu and it worked brilliantly.
>
>   Here is the link.
>
>   http://www.jsigle.com/musicol/emufix.htm

I looked at that page,  and would differ from what he says in some respects.  
He's taking it far enough to not see noise on the scope,  which is maybe 
going a little too far.  What I'd do is take it only far enough that the 
operation of the thing is going to be okay,  and no further.  Particularly 
without considering the details of the circuit around there,  which I don't 
happen to have a schematic for at the present time.  But that's just me...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin