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 generator. Layers allow advanced diagram generation for producing publishable schematics (more…)
Posts Tagged ‘electronic’
ProSchematic 1.01.001
Friday, June 26th, 2009Roll Your Own Electronic Lock
Thursday, June 25th, 2009Electronic 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. The lock uses the PC’s serial port to communicate to the PC, as well as derive power for its own operation. Commercially available dongles come in various shapes and connectivity. The most common type connects to the PC’s parallel port. Increasingly, dongles with USB connectivity also are appearing, and those using RS-232 connections exist as well.
Controlling the Brightness of an LED (Using PWM)
Monday, June 22nd, 2009It 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 want to control the speed of a motor with a microcontroller. It is not good enough to just turn the motor on and off. To control the brightness of the LED or speed of the motor you have to control the amount of current going through the device. But how? One solution that may occur to you is to quickly turn the LED or motor on and off. The current only flows when the output is low (for microcontrollers LED circuits are usually wired so current flows into the microcontroller when the output is low, as shown in the tutorial at http://www.iguanalabs.com/1st2051.htm). The output of your microcontroller will look like the following square wave. (more…)
Step by step Sim Clone Guide by Gsm Solutions Ltd
Sunday, June 21st, 2009original 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, we should be clear that this is only a partial flaw, not a total failure of the authentication framework: our experiments have been limited to showing that GSM phones can be cloned if the attacker has physical access to the target phone. (In US analog cellphones, one can clone the cellphones with only some radio reception equipment, which is a much more serious flaw; as a consequence, US providers lose over $500 million yearly to fraud.) (more…)
Conventional Microcontrollers
Friday, December 26th, 2008Instructions Set of the MCS-51
Wednesday, December 24th, 2008All instructions of the mcs-51 microcontroller are shown on 79 pages.
For example the instruction JB bit,rel:
(more…)
Tips for Designing PCBs w/ ExpressPCB
Friday, December 19th, 2008Placing 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. (more…)
ExpressPCB Software
Saturday, December 13th, 2008The ExpressPCB schematic and PCB design software is very quick to learn and completely free! Download a fully functional version here.
EAGLE Layout Editor for Designing PCB
Friday, December 12th, 2008The EAGLE Layout Editor is an easy to use, yet powerful tool for designing printed circuit boards (PCBs). The name EAGLE is an acronym, which stands for
Easily Applicable Graphical Layout Editor (more…)
DipTrace Free 1.30
Saturday, December 6th, 2008DipTrace 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 many innovative features. Output formats are DXF, Gerber, N/C Drill and G-code.