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How to make a beefy joule thief ?

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Well-Known Member
How to get 5V at least at 1 Ampere from a very low voltage source, at nearly 1 Volt capable of 10 Amperes; using a power transistor or mosfet and larger wire transformer instead of the usual awg#38 on ferrite bead ?

Make a Joule thief.


Don't know much about boost converters, but you get nothing for free. Where are you going to find 1 volt, 10 amp source? Maybe a huge capacitor, but it would be brief.

Might try this link
+5v to +12v converter

Not the joule thief, but explains what's going on pretty good.


New Member
Forum Supporter
The problem with trying to boost a very low voltage like that is switching losses.
ie: A 0.5V drop across the switching device in a 10V input supply doesn't effect the efficiency as bad as a 0.5V drop across the switching device in a 1V supply would.
You could possibly use the classic joule thief circuit to supply enough voltage to start up one of the standard switching ICs. Once running, the IC could supply it's own source of higher voltage for itself and driving the FET switch.
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