Author Options:

Joule thief's....? Answered

Do all the components make a difference in the efficiency of the joule thief? i.e type of transistor, resistor, capacitor...


The forums are retiring in 2021 and are now closed for new topics and comments.

Best Answer 11 years ago

Yes they do in theory, although by how much I have not measured. The transistor is used as a switch in the circuit, either ON or OFF. A transistor that switches faster will waste less energy, as will one that gets to saturation at a lower current. (saturation : when the Base current is high enough that the Collector-Emitter resistance is lowest, ie transistor fully ON) A 'better' transistor leads to the Base drive needing a smaller current for the transistor to reach saturation. You can use a higher resistor value, which means less energy wasted.