Doepfer

Hello there,

there is currently a lot of talk going on about Doepfer not supporting
the +5V rail with the standard housings. Here is the thread:
http://www.muffwiggler.com/forum/viewtopic.php?t=24399

Short summary:

a. There is definitely a demand that the power supply in the standard 
housings supports +5V
b. +5V is used for digital modules and therefore should have a separate 
digital ground on the whole way (module => cable => bus board => power 
supply) to avoid digital noise coming over the common ground.

Necessary steps:

For a:
1. Using either tri output power supplies like the ready-made Meanwell 
T-60C or an additional 5V power supply, e.g. the Meanwell S-25-5 with 
5,0A of +5V. Meanwell is just an example, there are several other 
manufacturers like Power One and a current transformer with 
+5V/+12V/-12V outputs could be used, too, of course.

For b:
2. Change the specification for the power connection so that one of the 
three ground lines is reserved for the digital ground while the other 
two remain for the analog ground. It would still be compatible to the
old specification with the downside of more noise which is what happens
at the moment anyway when the +5V is taken from the +12V rail without a
separate digital ground.
3. Change the bus boards to implement the separate digital ground.
4. Change the existing +5V modules to make use of the separate digital 
ground.

While we are at the subject of a bus board change: There is a big demand
for keyed connectors, too. They would help to avoid wrong connections 
for modules which use the specification, force the manufactures who are 
ignoring the key position specification to support it and help to 
connect the modules which is currently a pain in the a**.
I myself would gladly pay the slightly higher price for keyed connector 
bus boards.

Cheers
Joachim