Blog Archives
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]
Posted on 31 Jan 2008
If you have some old junk electronic parts and extra circuit boards laying around, don’t leave it around the your room,make a cool gift like resistor man, he makes a cool piece of art from junk electronic parts such resistor and LED.[more]
Posted on 31 Jan 2008
This SMD op-amp project uses the TI RC-4560 dual op-amp chip and a salt water-etched PCB. The builder got the op-amp as a free sample from Texas Instruments and scavenged all of the SMD resistors from old hard drive electronics. The results are not pretty, but they’re functional. The circuit used (with some changes) is the Chu Moy design found here. The CMoy circuit is not SMD. [more]
