Posted on 15 Jul 2008
This small realization, based on one of the most common IC (MAX232) is designed to create a small and convenient TTL to RS232 and vice versa convertor.All you need is 4 caps, one IC and 2 connectors. If you want to add a small regulator on the board (already foreseen on the PCB) you just need to add a 78L05 regulator and a cap.[more]
Posted on 10 Jun 2008
The 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.The program consists of three main modules ,Layout Editor ,Schematic Editor and Autorouter .New version 5 released.[more]
Posted on 13 Mar 2008
This is an improved version of Mitch Altman’s Brain Machine.The hardware is based on an ATMega8.It uses only very few of the I/O ports: two for audio, two for LEDs, one for a pushbutton, so it should be easy to use another controller that has an 8bit timer with two PWM channels (OCxA, OCxB).Add a piece of prototyping PCB, four capacitors, two resistors, a switch, connectors for headphones and glasses, and two AA cells, and you’re done.[more]
Posted on 26 Feb 2008
This is good looking and practical device that may be useful in many areas where count down timer is needed (no bombs please). Its time can be adjusted in range from 1 minute to 99 minutes. It displays time sequence on BCD decoded 7 segment LED display. When count down finishes - timer sends a control signal to relay.Complete design is made on wiring technique, so no PCB is available. Project is very well described with circuit operation animations what is really helpful for circuit beginners. Source code is also documented well with flow charts. Assembly code and hex file may be downloaded here. [via][more]
Posted on 20 Feb 2008
This frequency synthesizer use MAX038 waveform generator devices from MAXIM and control by PIC16F877 which is a popular microcontroller from Microchip.But,the author not made a schematic detail, he made a PCB for this project only which the main PCB include with MAX038 high frequency waveform generator, powersupply and 16F877 PIC controlling the frequency synthesizer.But,over all design look very nice.[more]
