Doepfer

hi everyone-
thanks for the replies.  i think if the current available in the 
beauty case can accomodate an a110 plus a few other modules etc, then 
that would work fine.  i'm very pleased by the thought of having a 
little station to swap out mini-patches for live use.

additionally, the DIY power supply is a good option for my 
intentions.  the heat sink is rather large, but it may fit into my 
plastic 36hp case, and i would need to cut down a bus board- not a 
problem.

when will the DIY power supplies be available?  i look forward to 
hearing the results of your tests with the beauty case power supply.

-tom

--- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:

> 
> The 100mA spec of the A-100 miniature power supply is very 
precautious and
> has primarily to with the max. temperature of the voltage 
regulators.
> Actually the voltage regulators (standard 7812/7912 types) can be 
used up to
> 1000mA provided that the temperature does not exceed 70 degrees 
Celsius. For
> this heat sinks have to be used to keep the temperature below this 
value.
> Even the environment has an influence as the air flow around the 
heat sinks
> affects the temperature (e.g. in a small enclosure the heat sinks 
will heat
> up more than in a large enclosure).
> 
> At the moment we are about to find out if the miniature power 
supply is
> sufficient for a typical combination of modules in the "beauty 
case" with
> max. 200 mA. As mentioned it's not an electrical but a temperature 
problem.
> We will run a typical combination of modules (incl. 2xA-110 with 
70mA each)
> for several days and measure the temperature of the heat sinks 
inside the
> "beauty case" now and then. In the worst case we will simply have 
to use
> larger heat sinks to obtain the 200 mA.
> 
> Normally the 4 bus connectors of the miniature power supply will be
> sufficient for modules mounted to the "beauty case". If actually 
more than 4
> modules have to be installed there is a simple solution: a "double 
bus
> cable" with one bus connector and two module connectors. In this 
way two
> modules can be connected to one bus connector only.
> 
> I hope the beauty cases will be available soon. Our case 
manufacturer is
> very busy at the moment. This is why the cases are not yet 
available (we
> expected to have them available end of January).
> 
> Best wishes
> Dieter Doepfer
>