why are cellphone chargers so small? Answered
i was thinking what kind of transformer are in those cellphone chargers. their output are so high considering their very small size.
is it possible to use audio transformers to step down mains AC? if yes, is it safe?
my professor gave us a very simple project - to make a power supply. of course i will use a transformer. when i pass my project she told me that i used a audio transformer. i don't know that the transformer was an audio transformer because it was labeled 220v 50Hz to 9v 200mA
i searched my area for transformers i found several with identical ratings but they are significantly larger. my conclusion is my transformer was small due to the fact that it is an audio transformer. when i searched for audio transformer i found a lot of very small transformer. now, is it safe to use those very small transformers to step down 220VAC mains?