Your idea seems rather more complicated than Dieter's - and in either
case we would void the warranty. I wonder if there's a way to do it
without losing the warranty - Does Dieter offer any kind of a
modification service where the warranty would still be okay
I've done similar things before (modifying four of An.Sol's
sequencers by installing a rotary switch to select the length of
sequence, from 1 thru 8 events, and other stuff), so I think this
wouldn't be a problem. It's just that my mixers are brand new.+
Thanks for the advice.
Richard

--- In Doepfer_a100@yahoogroups.com , Florian Anwander
<Florian.Anwander@c...> wrote:

> Hi Richard
>
> > Is it possible to couple together two Doepfer A138 mixers to give

me

> > eight inputs
> > Anyone know if this is possible
> another suggestion (as potential alternative to Dieters

instruction):

>
> I have the output potentiometer always set fully clockwise. In

other

> words: I do not really need it.
>
> So why not
> - replace the poti electrically by fixed resistors
> - mount a socket to the hole where the poti was mounted
> - connect this socket with a fixed resistor pot and resistor
> to the central mixing point of the mixer.
>
> I do not know the real potentiometer and resistor values at the

moment,

> but try these.
>
> Oldinputs O--+
> P 100k
> 50k P<-----rrrrr---+
> P |
> | |
> Gnd |
> |
> |
> Oldinputs O--+ |
> P 100k |
> 50k P<-----rrrrr---+
> P |
> | |
> Gnd |
> |
> |
> Oldinputs O--+ |
> P 100k |
> 50k P<-----rrrrr---+-----To summing amps
> P |
> | |
> Gnd |
> |
> |
> Oldinputs O--+ |
> P 100k |
> 50k P<-----rrrrr---+
> P |
> | |
> Gnd | existing mixer
> ............................|........................
> 100k | new input
> New Input O--+------rrrrr---+
> |
> r
> r 47k
> r
> |
> r
> r 3k3
> r
> |
> Gnd
>
>
> So you would get a fifth input with fixed amplification, which can

be

> used as for stacking mixers.
>
> Florian