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I have 5 mA DC current with 0.9 volt from a galvanic metal circuit. I want to turned on a LED light using this current. Is it possible? If possble, I do not want to use a battery.
And got the following answer:
You need to use a "Joule Thief" circuit which is basically a blocking oscillator which bumps up the voltage to drive the LED. Two of your galvanic cells in series would be better but a Joule Thief can be made to work at 1.0V, perhaps just maybe 0.9V. There a couple of examples in the links below.