Doepfer

Indeed we did not add this information to the DIY page because nobody was
asking. You are the first one.

For the A-143-1 the corresponding capacitor is "C1" (standard value 2.2uF)
and is located behind the LED that displays the envelope.

Best wishes
Dieter Doepfer


> This looks like a fantastic mod.
> Forgive my n00b questions here:
>
> 1. Is the switch a DPDT ON - OFF - ON? (I assume it doesnt matter if
> its a make-before-break or not)
> 2. When you say "short across the caps", are you referring to adding
> capacitors in parallel to the existing timing cap?
> 3. Is the electrolytic the timing cap?
>
> I checked the DIY page but did not find this mod there.
>
> Thanks!
>
> --- In Doepfer_a100@yahoogroups.com, "Dieter Doepfer" <hardware@...>
> wrote:
> >
> > Peter,
> >
> > thank's for this idea. We could add the capacitor positions of all
> > corresponding modules (envelope generators, LFOs ...) to our DIY page if
> > there are sufficient inquiries.
> >
> > Best wishes
> > Dieter Doepfer
> >
> > > -----Ursprüngliche Nachricht-----
> > > Von: Doepfer_a100@yahoogroups.com
> > > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von (i think you can
> > > figure that out)
> > > Gesendet: Dienstag, 27. Juni 2006 18:23
> > > An: Doepfer_a100@yahoogroups.com
> > > Betreff: [Doepfer_a100] A-143-1 Timebase modification: Fast, easy.
> > >
> > >
> > > Yo.
> > >
> > > Bringing my head above ground here for a second to give you the
> > > scoop on a very easy, yet effective modification to the Quad A/R
> > > Gen, the A-143-1.
> > >
> > > As you know, I like long envelopes. Adding a ON-OFF-ON switch
> > > which will short in two additional caps across the 143-1's
> > > 'money' (timing) cap will get you there if you want by adding the
> > > very same range switch function inherent on the Doepfer ADSR.
> > >
> > > I've uploaded a diagram into the photos section of this
> > > yahoogroup (pardon the snap - it was done on my cell phone).
> > > It's entotled A143-1mod.jpg. It shows the mod itself (easy) and
> > > where I opted to locate the switches, which nestled in neatly in
> > > the blank area above the Voltage Output jacks of EG's 2, 3 and 4.
> > > In that there wasn't an easy way to integrate the switch into the
> > > first EG, I left that one alone.
> > >
> > > Using an ON-OFF-On switch allows you to to take the additional
> > > caps out of the circuit altogether if you care to (switch resting in
> > > the center position).
> > >
> > > BTW - this mod can be added to any EG. All you have to do is
> > > find the timing cap and short additional caps over it. In this
> > > specific mod, I used a 47uf on one side of the switch and a
> > > 150uf on the other. So, long and loooooong.
> > >
> > > enjoy (or not!)
> > >
> > > - P
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
>
>
>