You find my comments written inline.

Dieter Doepfer

> Hello,
>
> I can tell you why the sales on the +5V supply was poor:
>
> 1. Not everyone wants to DIY.
> 2. Many people are afraid to DIY with power supply stuff.
> 3. Years ago there were not that many digital modules.
> 4. DIY people tend to buy from elsewhere anyway.

The +5V supply A-100NT5 was not DIY but a regular product. All A-100 cases
could be ordered with or without the +5V supply. Only for the belated
installation of the A-100NT5 some electronic experience was recommended
because of the mains wiring (no soldering was necessary, only installation
of some connections and mechanical mounting).

> If you plan to abandon the +5V you should at least act consistent:
>
> 1. Change the graphic
> http://www.doepfer.de/a100_man/a100t_3.gif
> and add an 'obsolete' to the +5V rail.

We will not change the A-100 bus layout because it's possible to add +5V,
e.g. by means the A-100AD5 or the (obsolete) A-100NT5 or any other +5V
supply. The +5V rail is an option as well as the CV and Gate rails which
have not be used unconditionally.

> 2. Pump up the +12V to handle the additional current.
>
> Btw. if you would use something like the Meanwell T60B or the Taco TXL
> 060-0522TI you could have +5V AND make the power supply cheaper. Then no
> one would complain to pay more for the +5V supply.

We tried to change the supply to switching supplies because it would be much
easier for us not to distinguish between 230V and 115% cases. We did not
find one that was sufficient quality. The main problems were interferences
and unsufficient voltage stability while the load changes (e.g. if many LEDs
turn on/off simultaneously). You find some of these switching supplies on
our special list because we decided not to use them in the A-100 cases.