Doepfer

I was looking at the OEM products and wondering why there wasn't anything to build one's own c/v controller. Everything is for MIDI which is strange to me.

I would love to build controllers but it would be much easier if the actual main circuit was already available as a development platform.

I know Dieter is very responsive to the users opinions maybe this is an idea that will interest other people.

In the meantime if someone has a suggestion for another solution, I would love to hear it.

Hi Tommy,


Can you elaborate on what you'd define as a "CV controller" ?
Joysticks, attenuators, switches, etc... ?

_g

On 18 May 2009, at 03:52, Tommy DOG wrote:

> I was looking at the OEM products and wondering why there wasn't  
> anything to build one's own c/v controller. Everything is for MIDI  
> which is strange to me.
>
> I would love to build controllers but it would be much easier if the  
> actual main circuit was already available as a development platform.
>
> I know Dieter is very responsive to the users opinions maybe this is  
> an idea that will interest other people.
>
> In the meantime if someone has a suggestion for another solution, I  
> would love to hear it.
>

What do you mean with c/v controller ?

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Tommy DOG
> Gesendet: Montag, 18. Mai 2009 03:53
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] No voltage control OEM / DIY Products
>
>
> I was looking at the OEM products and wondering why there wasn't
> anything to build one's own c/v controller. Everything is for
> MIDI which is strange to me.
>
> I would love to build controllers but it would be much easier if
> the actual main circuit was already available as a development platform.
>
> I know Dieter is very responsive to the users opinions maybe this
> is an idea that will interest other people.
>
> In the meantime if someone has a suggestion for another solution,
> I would love to hear it.
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> What do you mean with c/v controller ?


To be more clear, I would like to be able to have a circuit board that has multiple c/v outputs and a single or even multiple inputs that one could attach accelerometers, switches, touch pads, sensors, etc.  

The main interest would be that one could develop controllers within the modular framework without using MIDI. There are now many products on the market for this type of experimentation having one specifically to use with modulars would be nice.

Nice idea, the trouble is that all these different devices have very 
different specs, so while universal 0-5V or +/-5v CV output would be 
handy, the amount of tinkering to get different input devices to 
interface with that would pretty much be the equivalent of building 
the whole thing yourself.

If you take an Arduino for example, yes you have MIDI out, but you 
still need to do a lot of fiddling about to get the inputs to behave 
so as to derive useful signals in the first place.

sean

>--- In 
><mailto:Doepfer_a100%40yahoogroups.com>Doepfer_a100@yahoogroups.com, 
><yahoo@...> wrote:
>>
>>  What do you mean with c/v controller ?
>
>To be more clear, I would like to be able to have a circuit board 
>that has multiple c/v outputs and a single or even multiple inputs 
>that one could attach accelerometers, switches, touch pads, sensors, 
>etc.
>
>The main interest would be that one could develop controllers within 
>the modular framework without using MIDI. There are now many 
>products on the market for this type of experimentation having one 
>specifically to use with modulars would be nice.
>
>
>


[Non-text portions of this message have been removed]

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> Mostly it's nothing but
> some kind of amplifier as shown on our A-100 DIY page adopted to the special
> requirements (like suitable amplification, adding or subtracting an offset
> voltage and maybe voltage inverting).

Thank you Dieter. As I am not able to read schematics I have been doing much guess work. This statement gives me much needed information as I couldn't decide between oscillators and amplifiers to experiments with as drivers.

TD

--- In Doepfer_a100@yahoogroups.com, Sean Williams <sean@...> wrote:
>
> Nice idea, the trouble is that all these different devices have very 
> different specs, so while universal 0-5V or +/-5v CV output would be 
> handy, the amount of tinkering to get different input devices to 
> interface with that would pretty much be the equivalent of building 
> the whole thing yourself.
> 
> If you take an Arduino for example, yes you have MIDI out, but you 
> still need to do a lot of fiddling about to get the inputs to behave 
> so as to derive useful signals in the first place.

I'll brush up on my math.

Thanks.

Tommy DOG skrev:
> To be more clear, I would like to be able to have a circuit board that 
> has multiple c/v outputs and a single or even multiple inputs that one 
> could attach accelerometers, switches, touch pads, sensors, etc.
> The main interest would be that one could develop controllers within the modular framework without using MIDI. There are now many products on the market for this type of experimentation having one specifically to use with modulars would be nice.
>   
that "device" would just be a simple 5v regulator, which is hardly a 
product that one can market (well, they do that! It's the 5v regulator 
thing you get for the digital doepfer boards)
 Check the "Basic Circuits" section of the doepfer diy page - the 
"Simple attenuator" after a 5v source is what you need.

Andreas

I think it's not easy to built a universal board that covers all
applications because different sensors require different signal processing.
It depends upon the type of sensor output (e.g. voltage, current, variable
resistor/capacity/inductivity), the input range of the sensor parameter and
the desired output voltage range. For example the circuit of the A-198
includes two such "interfaces": one for the position sensor (three-terminal
potentiometer-like sensor) and one for the pressure sensor (variable
resistor). Other examples are the A-174-1 (joy stick) or the announced
A-174-2 (wheels). In any case the circuit has to be adopted to the sensor.

From our experience the inquiries for anything that has to do with DIY (e.g.
A-138x, A-101-9) are very poor. After all it's not very complicated to built
such an interface from the technical point of view. Mostly it's nothing but
some kind of amplifier as shown on our A-100 DIY page adopted to the special
requirements (like suitable amplification, adding or subtracting an offset
voltage and maybe voltage inverting).

Best wishes
Dieter Doepfer

> To be more clear, I would like to be able to have a circuit board
> that has multiple c/v outputs and a single or even multiple
> inputs that one could attach accelerometers, switches, touch
> pads, sensors, etc.
>
> The main interest would be that one could develop controllers
> within the modular framework without using MIDI. There are now
> many products on the market for this type of experimentation
> having one specifically to use with modulars would be nice.