Eml synthesizers

Hi there.

Did you ever finish work on your EML ?

Where are you located?
I've got several repairs and mods that I'm planning to do on mine. .
Though I could use help on some of it.

I'm willing to pay, of course.

Let me know if you might be interest!

-robert andrew scott
(540) 842-5985
otherdreams@...


--- In emlsynth@yahoogroups.com, David Cornutt <cornutt@...> wrote:
>
> I sent this out to synth-diy a couple of days ago, but I
> thought I'd send it here too...
> 
> EML 101 owners: What mods have you made or considered to
> your synth?  I'm about to undertake a set of mods with mine, and
> I thought I'd ask around to see what other ideas there are out there
> while I've got mine on the bench.  Here's what I'm thinking about
> right now:
> 
> * An input jack to override the KB1 control voltage.  This should
> be fairly easy; I'll tap in at the OSC 2 control mode switch.  I'll
> replace the CM2 output jack with a switching jack that will
> override the source when a patch cord is plugged in.  This will
> provide me with a more usable CV input point for a MIDI-to-CV
> interface.  (A note here: I still want to be able to use the keyboard
> when I'm playing with patches, so I don't want any mod that
> permanently disables the keyboard jack.)
> 
> For the mods below I'll appropriate one of the groups of
> multiple jacks:
> 
> * An input jack to externally gate envelope 1.  My 101 already
> has an external gate in for envelope 2; I'd like to have separate
> gate ins for each envelope.  This gives more flexibility in connecting
> the gate out of the MIDI-to-CV interface (as opposed to hacking
> in to the keyboard jack).
> 
> * An input jack to override the oscillator 1 source input to the
> sample-and-hold.  The fact that the S/H source is hardwired to
> OSC 1, with no patch point is about the only thing I think they did
> really wrong with the original design.
> 
> * A jack to access the output of exponential amp 3, which is
> dedicated to the filter in the original design.  The main use for
> this would be to have a V/Hz control voltage source for use with
> oscillator 1, which lacks its own exp amp and so doesn't track
> properly if you feed it a V/octave CV.  But I could see it being
> put to other mischief...
> 
> * A input jack to override exp amp 3's connection to the filter.
> This way, I could drive the filter with an external source while using
> the filter mixer, and exp amp 3, for another purpose.
> 
> What other ideas are out there?  One that I've heard of is a mod
> to the filter to eliminate the attentuation that occurs when you turn up
> the resonance (and prevents the filter from self-oscillating).  Is the
> EML filter suitable for this kind of thing?  (I have a feeling it isn't,
> which is okay; it's a unique filter and I can get self-oscillating 
> filters
> elsewhere.)  I'd like to avoid doing anything that would be 
> irreversible;
> I'd like to be able to put it back in factory spec if I decide to sell 
> it
> someday.
> 
> P.S.: one reason I've got it open is that the keyboard S/H suffers
> from S/H droop.  Is this likely to be just the capacitor, or am I
> possibly looking at having to replace one of those FETs?
>