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Originally Posted by dstampe
This shows a big spike of current draw as it starts up and charges all its capacitors. Then the variable load producing the noise is a combination of this supply and the variable capacitive load as different lines in the eInk display are charged and discharged, Obviously this is a big user of power.
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I agree on all points but one: that spike is the
inductor in the eink DC-DC convertor being charged.