Doepfer

me three.
-psm

> Hi Tim,
> Good idea, if you do try it let us know what happens. If it works 
> please post a pic of the mod so I can try it.
> 
> JOhn.
> 
> 
 <timothy@t...> wrote:
> > Hi all,
> > 
> > This morning I was having a quick look through the new Analogue 
> > Systems group and noticed a comment that Bakis made about not 
> being 
> > able to get Doepfer envelope generators to auto-repeat. So, 
> thinking 
> > cap on and schematic of A-140 in hand I sat down, and after some 
> > while I came up with a simple way to do it. With an extra diode, 
> > resistor and op amp I have lashed it up on some breadboard and 
> have 
> > been playing with it for the last hour or so, and it seems to do 
> the 
> > job. All it does is sense when the envelope has got down to the 
> > sustain level, and then generates a pulse that is fed back into 
> the A-
> > 140 retrigger input, and hey-presto, auto-repeat!
> > 
> > A little more thought suggested that the op amp currently used for 
> > the inverted envelope output could be used to do this - thus with 
> a 
> > few pins, cutting a track or two, add a couple more components, 
> and 
> > this could be turned into a nice little mod to the module. The 
> > new 'sustain level reached' signal would be output at the old 
> > inverted output and fed back to the re-trigger input for auto-
> repeat -
> >  if this was taken through an A-150 switch one could also select 
> its 
> > use via voltage control.
> > 
> > I haven't worked out the full details yet, but I expect it would 
> be 
> > about the same complexity as what I suggested to fix the problem 
> with 
> > the A-150 (anybody else actually had a go at doing that by the 
> way?). 
> > I thought I'd run it by people first to see what the interest is, 
> if 
> > any (what might seem simple to some may not be so for others...!). 
> > (On the other hand I might just buy another A-140 and do it 
> anyway.)
> > 
> > As for the A-141, I note that there are currently two unused op 
> amps 
> > already on the board, so it's conceivable that the same sort of 
> trick 
> > might work with it too - I'll have a ponder on that too.
> > 
> > Cheers,
> > Tim