EI live in a country with 220-240V AC Supply.I want to make a transformer from 240V AC-12V DC.How?

I already have an LED torch that charges off AC it has a set of four diodes(supposedly bridge rectifier) and a big brown shiny TANK type of thingie which is all connected to the rechargeable battery in it(donno specs).
Hoping to make one of those.

frollard7 years ago
If the flashlight has the rectifier in there already, then its the simplest gadget you could ask for! Sweet!

You need a transformer wound 20:1. It's probably cheaper to find/source one from a 12VAC wall-wart plug...which already does exactly what you're looking for.

I need to clarify now: Do you want to make 240-->12VDC? I ask because if the flashlight has the rectifier you don't need another in the transformer.
mayur.phadte (author)  frollard7 years ago
I have ANOTHER flashlight with four diodes and that big brown thing.
I want to make one of those minus the flashlight.
I want 240VAC>>>12VDC..
If you just want to make a 12 volt transformer, you do as I said before, hook 240 volts up to a transformer wound 20:1, and on the other side of the transformer you put the rectifier and capacitor.