Thanks for the suggestions,
Why I want this design is that I want to power it off my UPS which is a
solar panel floating a lead acid accumulator of 20AH capacity.
The whole show will run for years at a time.
I also want to be able to switch decades and keep full scale values
as multiples of
1 microsecond, 10 Microsecond.............1 second.
No one seems to make dedicated BCD multiplying DACs anymore, and I
found the
effort in making them was not so great when you wanted a micropower
system.
With a high impedance resistor network CMOS will drive the low
currents very accurately
with near zero voltage offsets.
I will attach a circuit, it is not quite right yet, to show the
complete item,
I already have one running which was trimmed to death, this time I
wanted
to get it nearly right from the beginning.
I dont think I invented this circuit, but I can not find a reference
of how to calculate the right
decadal resistors.
cheers Neville Michie

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