Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

CRT display looks great on desk

CRT displays seems to be a technology of the past. But hobbyists love to play with tube things. Probably because they look great and brings some retro feeling. svofski had a 3ЛО1И tube display laying around and wanted to drive. His first thought were to build a clock, but realizing that it has a resource of 1000 hours dropped this idea. Instead he made a simple display that works as vector terminal driven from serial port. Data communication is handled by atmega8 microcontroller which also sends DAC values to tube control transistors. The other tricky part here is power supply. Tube requires 750 volts between cathode and second anode. Voltage is built up from 12V using push pull MOSFETs that are driven from microcontroller. There are some specifics that you will find in description. This CRT display is a nice attribute on a desk. Continue reading

RFDisplay – The Magnificent Display with RF Connection to a PC!

Have you ever thought that you can use some of your imagination to build something out of a large array of lights? However, you might think it’s pretty hard, as you didn’t sure how to connect a large number of them, especially when microcontrollers don’t have enough output pins for each light here? Well, your worries seem to be useless here. Do you know that the same persistence of vision tricks that are used to make a CRT display work could also be applied to LEDs in a grid pattern and there is an automated weather station that can be used to send weather data to the display from via a RF link? With these features, you can simply build an incredible RFDisplay! Basically, the main concept behind persistence of vision is that if a bright light is flashed the light will be perceived as being lit for a long time. As a result, if the light is flashed fast enough (over 60HZ in this display), it will be perceived as being constantly on. The display uses this trick to… Continue reading