Skip to main content

Bus Board Connections

I wrote about the busboard access that several A-100 modules have earlier in this blog.
All modules that can read and/or write to the A-100's internal busboard are mentioned in THIS post.

I did forget to mention a few things in my earlier post, and thanks to the Yahoo Doepfer Usergroup i stumbled upon the A-100BC (CV/Gate bus connection cable) that can be used if the CV and/or gate signals of two bus boards have to be connected internally.

For this the CV or gate corresponding connection jumper in the middle of the bus board is removed and replaced by the connector of the (20 cm. long) A-100BC cable. 
It is possible to connect the CV and gate lines of two bus boards independently (i.e. only CV or only gate or both). 
The cable is made of two wires with suitable connectors on each side. 
Usually one wire is used for CV, the other for gate, but the wires can be ripped up and used separately. 

Dieter himself did a great post in the Doepfer Usergroup that nicely explained how the internal busboard connections work:

" The main function of the bus is the power supply of the A-100 modules (-12V, GND, +12V and additional +5V for a few modules) - In addition a CV and Gate line are available
- Some modules can pick-up the CV signal (e.g. A-110, A-111-1, A-111-5, A-143-4) from the bus depending on the jumper setting on the module (full list HERE /PP)
- Some modules can pick-up the gate CV signal (e.g. A-140) from the bus depending on the jumper setting on the module (full list HERE /PP), but most of the A-100 modules have no access to the CV or Gate signal of the bus

- Other modules may work as transmitter for the CV signal to the bus (e.g. A-190-x, A-185-x) depending on the jumper setting on the module (full list HERE /PP)

- Other modules may work as transmitter for the gate signal to the bus (e.g. A-190-x, A-185-1, A-164-1) depending on the jumper setting on the module (full list HERE /PP)
A-100 BC cable

- Pay attention that only ONE transmitter for CV and ONE transmitter for gate are allowed (otherwise modules may be damaged)

- Using the internal CV and Gate lines of the bus is optional (one may also patch the required connections via the sockets at the front panels), but using the internal CV and Gate lines may simplify the patching at the front panels (e.g. if several VCOs have to be controlled by the same CV, in this case the A-185-2 is recommended as CV transmitter to the bus, the A-185-2 allows also common octave switching and common frequency modulation of all VCOs as well as CV summing, e.g. from a sequencer and CV keyboard or Midi-to-CV interface)

- Both the CV and the Gate line can be interrupted in the middle of the bus board to establish two different CV/Gate areas.
For this the corresponding jumper in the middle of the bus board has to be removed.

- A special CV/Gate bus connection cable A-100BC is available.
This cable can be used to connect the CV and/or Gate lines of two different bus boards.
To connect the two boards the same pin headers of the two bus boards may be used that also interrupt the CV and/or Gate lines, but it is also possible to connect the corresponding pins (Gate and/or CV) of other unused bus connectors (i.e. one of the 14 16 pin connectors) "

Source: Yahoo Doepfer A-100 Usergroup

Popular posts from this blog

DIY Modular Case Ideas

There are many ways to house your (eurorack) modular synth, i wrote about the pre-manufactured options from Doepfer earlier, find that post HERE, but of course you can also try to build you own case.
There are many ways to make your own A-100/Eurorack case if you start out with just the basic rails and busboard, and you can make it as cheap or expensive as you can.

Check out a few ideas;
Wooden cabinets and side-panels are still very popular amongst (modular) synth enthusiasts.
These simple case standards for the pre-manufactured LC9 cases are very simple, and can be sooo useful
http://synthesizerart.blogspot.com/2011/10/dual-doepfer-lc9-case-stand-v1-design.html Also check out the other great modular pictures on his site.
Matthew Goike (@Goiks) also has some nice wooden cabinets on display and for sale on his website: http://www.goike.com/node/5

...or do what Stretta did (or rather what his brother did), make a high-end wood/brushed aluminium cabinet with integrated LED-lights and some …

Doepfer A-150-8 Octal Manual/Voltage Controlled Programmable Switches Announced

Doepfer has just released some info on their new modules for NAMM 2017 (19-21 jan.) Besides some vintage editions of existing modules, the A-135ABC VC Performance mixer modules, the A-110-6Trapezoid Thru Zero Quadrature VCO and a new A-100LC1 case (economically priced small housing with 48 HP width) there was also one other interesting new module announcement:
Module A-150-8 contains eight manually/voltage controlled switches.  Each of the eight switches has a manual control button (Man.), a control voltage input (CV), a common Out / Input (O/I), and two In / Outputs (I/O1, I/O2).  The switches are bi-directional, i.e. they can work in both directions, so can connect one input to either of two outputs, or either of two inputs to one output. 
Two LEDs show which in / output is active (ie. which is connected to the common out / input).  In addition the LEDs are used for the programming of the module: For each unit the operating mode can be selected:  Toggle or Level controlled. In Toggl…

Happy New Year From PatchPierre

Hi there, it's me again... Happy New Year!

You might have noticed that I havent posted a lot in the last 2 years...
It's been a rough time for me since the sudden loss of two parents within a relatively short time-span and I really needed some time to get myself together... to set things straight, finding myself and selecting priorities... even my regular work suffered from this breakdown.

It took a while to understand it all, and to get a better grip on it, and it's sometimes still not very clear.
I think I have found a way to cope with most of it now... although the slight autism that I have (ADD-like) doesn't make it easy for, especially in crowds with lots of people I don't know...
On my journey I also (re-)discovered the beautiful woman that has always lived inside of me and that i need to accept and cherish... more on that maybe later... I'm not considering changing the name of the blog to PatchPetra.Net 😇 (...yet), but you might spot me somewhere at mod…