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The
circuit given below are in html format with the circuits in jpeg within
the
pages, but may not be complete, but you may get ideas, i even don't
remember
if they worked properly.
In
the digital potentiometer, connect pushbutton switches to fast and slow
with
one end to +7.5V, when you hold the button down the analog voltage will
ramp
up-down, fast or slow, this will enable you to make a digitally
controlled
millivolt source or power supply.
I did make a millivolt source with this and it still works after
15 years. Some ideas used in this i got from a magazine elektor and some
learning i got from another mag Radio Electronics.
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