Openchronos-ng / Wiki / Home. Apple iPhone charger teardown: quality in an tiny expensive package. Disassembling Apple's 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. How it works The iPhone power adapter is a switching power supply, where the input power is switched on and off about 70,000 times a second in order to get the exact output voltage required. Because of their design, switching power supplies are generally compact and efficient and generate little waste heat compared to simpler linear power supplies.
In more detail, the AC line power is first converted to high voltage DC[1] by a diode bridge. The DC is switched on and off by a transistor controlled by a power supply controller IC. The chopped DC is fed into a flyback[2] transformer which converts it into low voltage AC. The circuit in detail The primary Isolation. Embedded - What Skill set should a low level programmer possess. ARM creators Sophie Wilson and Steve Furber [printer-friendly] Unsung Heroes of Tech The Story so Far At Acorn, Sophie Wilson and Steve Furber have designed the BBC Micro, basing the machine on the ageing MOS 6502 processor. Their next challenge: to choose the CPU for the popular micro's successor. Now read on... While Sinclair attempted to move upmarket with the launch of the QL in early 1984, Acorn was trying to invade Sinclair's lucrative low-end territory with a cut-down version of the BBC Micro, to be called the Electron.
UK resellers assumed the Electron would be as big a success as the BBC Micro. They ordered in hundreds of thousands, but as the units stacked up in the warehouse the market collapsed. MOS' 6502: good enough for the Electron, not the BBC Micro's successor While Acorn was heading into cash-flow problems, Wilson and Furber had already become engaged in what would prove to be the biggest adventure of their lives. Sophie Wilson talks ARM Source: Wikimedia Wilson and Furber started visiting processor manufacturers. Simple? The universal simulator. Technology - Design Simulation and Device Models. Qucs project: screenshots. [ schematic area - dialogs - languages - miscellaneous - tools ] Screenshots of schematic and data display areas The screenshots below show the main schematic and data display area of the Qucs GUI on the lower right corner, the menus and icons at the upper part and the project/contents/component/action/diagram selection on the left hand side. Simple filter in qucs-qt4 Combined schematic and data visualisation.
Simple schematic area. Data display with different kinds of data representations (diagrams) and data markers. Data display with 3D diagram. Please note that the actual appearance depends on the window manager (window decorations), the selected type of font and its size and the widget set can be selected by the qtconfig program. Www.onsemi.com/pub_link/Collateral/N25S818HA-D.PDF. Fab in China Mainland-中国大陆晶圆厂一览-Y2008 - 公司情况交流 - 半导体技术天地 - 工程师的家园,专注于电子电路,半导体芯片,集成电路,太阳能电池,MEMS,LED等行业领域. MCM封装. Use a CPLD in your next design. Git - eis.git/summary. How FPGAs work. How FPGAs work Logic-cells FPGAs are built from one basic "logic-cell", duplicated hundreds or thousands of time. A logic-cell is basically a small lookup table ("LUT"), a D flip-flop and a 2-to-1 mux (to bypass the flip-flop if desired).
The LUT is like a small RAM that can implement any logic function. It has typically a few inputs (4 in the drawing above), so for example an AND gate with 3 inputs, whose result is then OR-ed with another input would fit in one 4-input LUT. Interconnect Each logic-cell can be connected to other logic-cells through interconnect resources (wires/muxes placed around the logic-cells). IO-cells The interconnect wires also go to the boundary of the device where I/O cells are implemented and connected to the pins of the FPGAs. Dedicated routing/carry chains In addition to general-purpose interconnect resources, FPGAs have fast dedicated lines in between neighboring logic cells. >>> NEXT - part 3: Internal RAM >>> CoolRunner-II CPLDs. Raspberry Pi. Components. Hardware Components. Vendors. Hardware/Electronics/Hacking/DIY/Etc. Sensors. Sensors.