Doepfer

is it possible to just buy the busboard on its own?

Richard
-- 
my website is full of sounds and sights http://richard-scott.net

Hello Richard

Scott schrieb:
> is it possible to just buy the busboard on its own?
http://www.doepfer.de/a100z_d.htm
search for "A-100MNT"
Powerregulator and busboard are one pcb.

Florian

ah, thank you Florian

(though its 50 euros! ouch!)

On 1/26/11 10:07 AM, Florian Anwander wrote:
> Hello Richard
>
> Scott schrieb:
>  > is it possible to just buy the busboard on its own?
> http://www.doepfer.de/a100z_d.htm
> search for "A-100MNT"
> Powerregulator and busboard are one pcb.
>
> Florian
>
> 

-- 
my website is full of sounds and sights http://richard-scott.net

Hi Richard

It should be very easy to make a bus board as DIY

Get a striped breadboard pcb like
http://www.strippenstrolch.de/grafiken/loch1.jpg
Cut it to get a 8 holes wide strip and solder the 16 pin headers on it.

Florian

Scott schrieb:

> ah, thank you Florian
> 
> (though its 50 euros! ouch!)
> 
> On 1/26/11 10:07 AM, Florian Anwander wrote:
>> Hello Richard
>>
>> Scott schrieb:
>>  > is it possible to just buy the busboard on its own?
>> http://www.doepfer.de/a100z_d.htm
>> search for "A-100MNT"
>> Powerregulator and busboard are one pcb.
>>
>> Florian
>>
>>
>

> Hi Richard
>
> It should be very easy to make a bus board as DIY
>
> Get a striped breadboard pcb like
> http://www.strippenstrolch.de/grafiken/loch1.jpg
> Cut it to get a 8 holes wide strip and solder the 16 pin headers on it.
>
> Florian

The simplest "bus board" is nothing but a 16 pin ribbon cable with several
female connectors (10 or 16 pin, according to the connectors of the modules)
which are attached to the bus connectors of each module (instead of the bus
cable delivered with the module). We do this now and then for special
applications (e.g. if there is not sufficient space for a bus board). But
it's recommendable for a few modules only and for simple applications
because of the voltage loss. The cross-section of the ribbon cable is much
less than the pcb tracks of the bus board (and has consequently a higher
internal resistance). This causes a much higher voltage loss than the bus
board. I'd not recommend it if VCOs are among the modules. But for control
voltage modules only (e.g. LFO, ADSR, Random CV, joy stick and so on) it
should work.

Best wishes
Dieter Doepfer

Hello Dieter,

> The simplest "bus board" is nothing but a 16 pin ribbon cable with several
> female connectors (10 or 16 pin, according to the connectors of the modules)
> which are attached to the bus connectors of each module (instead of the bus
> cable delivered with the module). 
We discussed this topic recently at the forum of www.sequencer.de. 
(http://www.sequencer.de/synthesizer/viewtopic.php?f=13&t=52973&p=545086&hilit=Doepfer#p545086=)

There are two disadvantages of the ribbon cable solution:
1.) if you do not have access to the rearside of the rack, then it will 
be quite difficult to insert a new cable to the bus between existing 
modules as the buscable will slip back in the rearside of the rack.
For a beauty case it may be acceptable that you have to unmount all 
installed modules, but not for larger cases.
2.) you will be in need of pin head sockets with housings like this...:
http://www.access-incc.us/ppidm.jpg
...which has a coding notch at the center. This notch fits with the 
coding noses of the module ribbon cables:
http://www.doepfer.de/a100_man/PV16.jpg
This means: there is only one orientation, in which you can insert the 
cable. Since the original busboards do not use this coding, there was no 
need, that the module ribbon cables are seated in a dedicated orientation.
So with such a kind of bus "board" you have first to plugin the cable 
into the bus cable and then in the module.

Florian

> Hello Dieter,
>
> > The simplest "bus board" is nothing but a 16 pin ribbon cable
> with several
> > female connectors (10 or 16 pin, according to the connectors of
> the modules)
> > which are attached to the bus connectors of each module
> (instead of the bus
> > cable delivered with the module).
> We discussed this topic recently at the forum of www.sequencer.de.
> (http://www.sequencer.de/synthesizer/viewtopic.php?f=13&t=52973&p=
> 545086&hilit=Doepfer#p545086=)
>
> There are two disadvantages of the ribbon cable solution:
> 1.) if you do not have access to the rearside of the rack, then it will
> be quite difficult to insert a new cable to the bus between existing
> modules as the buscable will slip back in the rearside of the rack.
> For a beauty case it may be acceptable that you have to unmount all
> installed modules, but not for larger cases.
> 2.) you will be in need of pin head sockets with housings like this...:
> http://www.access-incc.us/ppidm.jpg
> ...which has a coding notch at the center. This notch fits with the
> coding noses of the module ribbon cables:
> http://www.doepfer.de/a100_man/PV16.jpg
> This means: there is only one orientation, in which you can insert the
> cable. Since the original busboards do not use this coding, there was no
> need, that the module ribbon cables are seated in a dedicated orientation.
> So with such a kind of bus "board" you have first to plugin the cable
> into the bus cable and then in the module.
>
> Florian

Hallo Florian,

I know about the disadvantages but it's by far the cheapest solution. And
you don't need these ppidm.jpg male connectors if you remove the existing
bus cable from the module and connect the female connector of the new
"flexible bus board" directly to the pin header of the module.

Dieter