If you could do with 0.5V then 3.5A will be theoretically possible. Anyway, you will never get more power out than the initial 1.8W.i have dc power surce of 45V DC and 40 Milliamps current. my output current is in mili's and i need atleast 3.5 Amp at output..how I can arrive to the 3.5 Amp ? any Electronic circuit can do that?
With only 1.8 Watts available, you will only get a maximum of 132mA at 13.6v; the float voltage for a 12v lead-acid battery. That is if a converter were 100% efficient; and you will not get 100% efficiency out of a converter.
You cannot use the telephone line as a power source, or the telephone company will turn off your telephone service and charge you extra for the power that you have tried to steal from them.
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