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You don't need a flyback circuit. They are for getting high voltage from low voltage. You need a buck converter, or, if the current is low, a linear regulator, as Krumlink suggested.ice311087 said:hi guys,i would like to know if any of u can help me with a cellphone charger circuit using a flyback converter...(12V input-required output 5v)...its for my project
You can use a flyback converter for that.ice311087 said:thanks for that piece of info Ron...then is there some circuit that steps up a lower voltage to 5V...maybe from the ordinary 1.5v battery..
But if it's a school project, he might not get a very good grade if he buys one and submits it as his project.blueroomelectronics said:You can buy AA cell phone chargers for less than you could build one for.
I looked up a few definitions of flyback converter, and they seem to be pretty consistent in saying that the output is isolated by a transformer winding from the source. Otherwise, the circuitry is like a boost converter, which I guess the joule thief is. I'm sure you could modify the joule thief to have a transformer-coupled output, but why???RadioRon said:Isn't the classic Joule Thief circuit a flyback topology?
No, I didn't mean why were you asking. I was just asking a rhetorical question - why would anyone want to implement the joule thief with transformer isolation.RadioRon said:Well, I was really just curious.