Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
I teared down Samsung Charger USB, and traced the circuitry trying to study it's theory of operation. but I couldn't. It's of course 220V AC to 5V DC. Can anyone help me understanding it?
That schematic can't be right but basically it's a transistor oscillator running from the rectified incoming AC. The high frequency allows a small ferrite transformer to be used instead of a larger iron cored type. The secondary of the transformer produces the low voltage output to the phone.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.