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Doepfer

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Message

Re: voltage inversio n of CV signals

2002-07-23 by mdimmm

--- 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

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