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Why copy it? What the OP needs would be the little PCB that was just removed from the charger.The simplest way I can think of is to buy a cheap 5 volt transformerless wall wart, disassemble it and copy the circuit.
I can afford a transformer and I have made a normal power supply with a low cost transformer - the cost per unit is high compared with a transformerless power supply
Microchip offers aguide AN954 on these type of power supplies but they are for small current. I have seen them out there on commercially available products - anyone know how to do it?
.....possible, but NOT SAFE!
I can afford a transformer and I have made a normal power supply with a low cost transformer - the cost per unit is high compared with a transformerless power supply
Microchip offers aguide AN954 on these type of power supplies but they are for small current. I have seen them out there on commercially available products - anyone know how to do it?
Many of us have made them. I have even got one through UL, VDE and CSA and into production. To make a product to be sold in stores it must be "blessed" by the government. They do not like a transformer-less power supply! They will try very hard to keep you from passing the tests.I guess no one knows how - I will investigate by other means