This project shows the creation of a large array of UV LEDs. They are used to expose a presensititised blank circuit board. Another common method is to use UV Tubes. He used to make the isolation box: 54 UV leds buyed from E-bay for about 15 $ 18 resistors 68ohms, 1/4Watt for 0,60 $ 1 [...]

This RGB light I designed and built a while ago. A large spectrum of coloured light can be made mixing light from bulbs coloured in red, green and blue. So, this one is not based on LEDs but it’s based on 3×60W 220/110Vac light bulbs. Also, it has a remote controller to change intensity of [...]

This is a 8 channel RF remote control project. The transmitter powered by 5V.the RF module I used had long start-up and power down period after receiving a high pulse. To counter all of this I kept the receiver in constant standby mode, but sending a information all the time. That way the noise is [...]

Tehnikservice has a new design. Please spend a few minutes at the new site and leave your feedback, good or bad, in the comments. Finally, here’s how the site should ideally look on your computer screen. If you discover broken links or features that don’t work in your web browser, please do let me know [...]

A dice is essentially just a special display for numbers from 1 to 6. Why is a real dice a random number generator? If your hand would have perfect precision mechanics and you could control speed and position exactly then a real dice would probably be deterministic. In other words the one tossing the dice [...]

T1 KT315 – BD139

By Olivier de Broqueville Source: PICBASIC Complex LED Matrix

The system will only be required to measure close proximity at an angle of 90 degrees as seen in the example above. The range of system is roughly 4-30cm, 20-150cm & 1m-5.5m depending upon which sensor you choose to use. The outcome of this project will shape future projects where we try to integrate such [...]

This describes an easy method to make professional looking two-sided printed circuit boards at home. He use the toner transfer method of making PCB’s (printed circuit boards) Source: jmengel