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Date: Fri, 17 Jan 2003 00:37:07 -0700
From: Jim Drew
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Subject: PIC controlled variable power supply
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I am looking for a solution to a problem. I need to construct a power
supply that can be varied from 5 volts to 8 volts, controlled via PIC.
The output must be able to handle at least 500ma (preferably 1 amp).
I have thought of an adjustable voltage regulator like a LM317, but the
adjustment is on the ground side and the PIC can only sink 25ma of
current. If there is an inexpensive voltage regulator with some sort of
external adjustment, that would probably work. I have 8 output lines
that I could use an R2R ladder to generate the adjustment voltage.
Any thoughts on better methods??
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