Hi
Does anyone knows how to extract power from the mobile phone's audio jack or charging port and to provide that power to other circuit. There is 1 research paper regarding this [ http://web.eecs.umich.edu/~prabal/pubs/papers/kuo10hijack.pdf ] , but if I am not wrong, this entire thing is fairly complex.
Is there any other way to extract it. I need it to implement in my project work.
What are you trying to power? What sort of phone? There is a 3.3 Volt output on the iPhone dock connector, I believe.
I want to make a universal device that can extract power from any simple and generic mobile phone. Yeah, for my circuit 3.3 V is enough.
I'm not convinced you could do that. Not all phones have four connector jack sockets, where you could make use of the microphone/remote power supply.
There might be specific phones you could do it for, but I doubt that there is a generic solution since there is no standard way for handsets to provide power. Why do you 'need to implement in my project work'? Is this actually a requirement, or something that you have assumed in your solution?