Doepfer

Hi M.

> Actually, when I send a sawtooth signal to my software 
> oscilloscope, it shows up mirrored on the screen. When I patch 
> the signal through the A-119 (Asym. In) before sending it to the 
> computer, the waveform looks the way it does on the front of the 
> module. So it seems that the A-119 inverts audio signals. 

This is quite likely - I've noticed that several other modules do this, but
since these are generally processing audio, rather than CV signals, it won't
help your current problem!

> I believe the electronics involved in inverting a signal are 
> extremely simple (although I don't know what they are) which 
> makes me think it might be possible to fit the components into a 
> connector or something to be placed in between two patch 
> cables.

Yes, the electronics are quite straightforward - there is very little to an
A-175! One problem with trying to put it into a 'cable' will be supplying
power to it. It would be relatively easy to make up a longer than normal
power ribbon (I've made up several - Maplin in UK sell the necessary bits,
I'll check out part nos. if interested), attach it to an unused slot on the
busboard and then feed it out of the case at some convenient point in order
to drive a stand-alone 175, as Joe suggests.

Tim

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--- In Doepfer_a100@y..., Stinchcombe Timothy <
tstinchcombe@q...> wrote:
> Hi M.
> 
> > Actually, when I send a sawtooth signal to my software 
> > oscilloscope, it shows up mirrored on the screen. When I 
patch 
> > the signal through the A-119 (Asym. In) before sending it to 
the 
> > computer, the waveform looks the way it does on the front of 
the 
> > module. So it seems that the A-119 inverts audio signals. 
> 
> This is quite likely - I've noticed that several other modules do 
this, but
> since these are generally processing audio, rather than CV 
signals, it won't
> help your current problem!
> 
> > I believe the electronics involved in inverting a signal are 
> > extremely simple (although I don't know what they are) which 
> > makes me think it might be possible to fit the components 
into a 
> > connector or something to be placed in between two patch 
> > cables.
> 
> Yes, the electronics are quite straightforward - there is very
little 
to an
> A-175! One problem with trying to put it into a 'cable' will be 
supplying
> power to it. It would be relatively easy to make up a longer than 
normal
> power ribbon (I've made up several - Maplin in UK sell the 
necessary bits,
> I'll check out part nos. if interested), attach it to an unused
slot 
on the
> busboard and then feed it out of the case at some convenient 
point in order
> to drive a stand-alone 175, as Joe suggests.
> 
> Tim

I'd be very much interested in getting longer ribbon cables.
I'm also considering placing my A-174 outside the A-100 rack, so 
that the joystick is vertical. Maybe constructing a little box for it
so 
that it can stand on the table top like the usual computer joystick. 
The thing is, the cable that runs from the module to the busboard 
needs to be longer to do this. 
Are these cables with the connectors wired the way they are 
available longer from somewhere? I don't think I'd trust myself to 
open up the connectors and simply replace the cable with a 
longer one. Seems like a difficult series of small connections to 
make with my crude soldering skills. 

Are there people out there offering custom modifications to 
Doepfer modules?
I could think of some other things...

M. Dimm

Hey M.Dimm

It´s absolutely no problem to make a longer cable.
Every store with electronic components should have ribbon cables and the connectors (16 pins each!).
Soldering is not nesessary as you just have to put the cable between the two parts of the connector and press them together. (You´ll have to use a "little bit" of power to do it the right way. Good method: put the connector between a door and the door´s frame. Slam the door [I am not kidding!!] and the connector will be closed. I´ve done it that way and it´s working fine). 
Important: You´ll find a small arrow on the connector. That´s the place where the red stripe of the ribbon cable must be. Just have a look at a ribbon cable of your Doepfer.

By the way: it´s not possible to open the old connector, you have to buy a new one, but they´re cheap.
 

Paul


M.Dimm wrote:

I'd be very much interested in getting longer ribbon cables.
I'm also considering placing my A-174 outside the A-100 rack, so 
that the joystick is vertical. Maybe constructing a little box for it
so 
that it can stand on the table top like the usual computer joystick. 
The thing is, the cable that runs from the module to the busboard 
needs to be longer to do this. 
Are these cables with the connectors wired the way they are 
available longer from somewhere? I don't think I'd trust myself to 
open up the connectors and simply replace the cable with a 
longer one. Seems like a difficult series of small connections to 
make with my crude soldering skills. 




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