> The original circuit (attached) has a separate Vcc (eg battery) but I'm
> wondering if the Vcc for the ACS712 and associated circuitry can be
> powered from the mains via a capacitor dropper. You'd lose the
> isolation of course but for a self-contained sealed unit that wouldn't be
> important

 If you use a current transformer you may be able to power any output
electronics from it .
You need a certain minimum current to get enough voltage to be useful
OR charge a local battery when the output is high enough. .


                 Russell
--=20
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