Hi all,

 thanks for your comments that far. Most of your suggestions tend more or
less to eitherone of my initial concepts except using a reg with a shutdn
capability which is a third idea.

 From the standpoint of a simple clean concept one should probably take the
5V LDO. But each of the three concepts are fairly easy to implement. Because
it needs to be Low Cost i tend to leave the decision to the pocket
calculator.

By taking a cheap reg or even a zener then add up 2 transistors, 3 diodes
and some passives, i think there will be no big difference left compared to
the LDO, but it needs to be calculated more exactly to say. The discrete
approach however relies on standard components only.

Germain

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