In this IC-Databook Software you will find pin assignments, connection layouts, function tables and the most important specifications available for the 40x.. and the 74x.. [...]
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USBasp is a USB in-circuit programmer for Atmel AVR controllers. It simply consists of an ATMega8 and a couple of passive components. The programmer uses a firmware-only USB driver, no special USB controller is [...]
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This Infrared Remote Control circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The reciever circuit is based on the Radio Shack infrared receiver module(MOD), part number 276-137. It is also available from some of [...]
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original article
Many digital designs incorporate high-speed generation of pseudorandom numbers. Typically, pseudorandom number generation is implemented using linear-feedback shift register (LFSR). An LFSR produces a sequence of numbers that appears to be uniformly distributed over the range 1 to 2n ? 1, where n is the LFSR size. For this type of generator, each output [...]
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by Dhananjay V. Gadre
Electronic security locks, popularly known as “dongles,” are commonly used to deter software piracy. This idea describes a simple yet-powerful design of such a security lock using the linear feedback shift register (LFSR) principle. The lock, which is implemented using Atmel’s AT90S2323 AVR RISC microcontroller, connects to the PC’s RS-232 serial port. [...]
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ProSchematic is A shareware schematic editor for drawing and publishing electronic circuit diagrams; operating on Windows and Linux. An easy to use interface gives access to the major controls required for the current task in hand. Part attributes are shown for each part as they are selected. Has built in netlister and Bill of Materials [...]
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It is easy to use a microcontroller to turn LEDs on and off in almost any pattern you want. (Click here for more information.) But you can only turn the LED on and off. So what if you want to control the brightness of the LED? The same problem comes up in robotics where you [...]
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DipTrace is an advanced PCB design software application that consists of 4 modules: PCB Layout with efficient auto-router, Schematic Capture, Component and Pattern Editors that allow you to design your own component libraries. Besides being very easy-to-use, which is rare for a PCB design tool, this software possesses a very intuitive user interface and [...]
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original source : http://www.freewebs.com/simcloneinfo/
I have shown how parties with physical access to a victim’s GSM cellphone can “clone” the phone and fraudulently place calls billed to the victim’s account. This shows that the GSM fraud-prevention framework fails to live up to expectations, and casts doubt on its foundation (as well as the design process). However, [...]
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Placing Components
Generally, it is best to place parts only on the top side of the board.
When placing components, make sure that the snap-to-grid is turned on. Usually, a value of 0.050″ for the snap grid is best for this job.
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