Disassembling Apples diminutive inch-cube iPhone charger reveals a technologically advanced flyback switching power supply that goes beyond the typical charger. It simply takes AC input (anything between 100 and 240 volts) and produce 5 watts of smooth 5 volt power, but the circuit to do this is surprisingly complex and innovative.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Python for Microcontrollers — sysfs is dead! long live libgpiod! libgpiod for linux & Python running hardware @circuitpython @micropython @ThePSF #Python @Adafruit #Adafruit
Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !
Cool! can you reverse engineer a circuit diagram out of that puppy? How many layers are in the PCB? Does it have a wound transformer – how does it achieve the voltage step down? Are there any chip / coding devices that mark the charger as being “Apple only?”
I wonder how much of this super-filtered design is because they had issues with the touchscreen on the 1st gen not being stable with normal supplies. I know that some of my laptops don’t deal well with 1st gen iPad charging (the touchscreen jitters around and on one registers phantom touches).
Richard: I included a circuit diagram in the original article. The PCBs (two of them) are two-layer. Yes, it has a flyback transformer – the article includes a complete transformer teardown. It uses the same Apple-proprietary D+/D- resistors to indicate that it’s an Apple charger that Adafruit discovered earlier.