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Regulators failing

colin55 said:
Just put a zener regulator on it. (30cents)
Click to expand...

The problem there is that the 4V line is sometimes supplied from a Li-Ion battery. The voltage varies in the 3.3 - 4.1 V range and I don't want to drain the battery too quickly. The load varies, depending on how fast I am clocking the PIC.
 
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