If you want to give life to the old table lamp, replace the orange “hot” light with a clean, “cold” and white, built the project with white LED diodes as the light source matrix.The continuous change of the light source you can build the proposed electronic-switching regulator in pulse width modulation.Associate surrounding red light only [...]

Nowadays is so easy to build precision digital LC meter with LCD display and microcontrollers.But, what about 1997? There is my first very precision ANALOG LC METER. Look at this, butdo not fall in love in retro princess from past!!The analog LC-meter project (AP-LC1) have more then 3% accuracy. Really!There is no balanced bridge, or [...]

This post will show you how to make a thermometer that displays the temperature of the air. It’s not the most accurate thermometer in the world, but for this price and the fact that it was homemade… Source:DemonDomen

This device plugs in-line with the PS2 port and hijacks key presses. When a username is typed in, it records the following password. Source: shawnlankton

This is a PIC based system that implemented a closed-loop PID controller for position and speed control of two DC motors. In addition, the control loop could be adjusted to induce arcs. The system was designed as a peripheral for another processor so it also had an SPI command interface that allowed it to be [...]

One very important Part of a Tube Amplifier is the Power Supply. It is crucial for the quality of the whole system. Especially beginners encounter problems like Hum or Drift that can become quite annoying. But resue is ahead: The following circuit uses a modern Mosfet to deliver a stable and virtually Hum-free voltage to [...]

This is a simple project, but one I hope you will find useful. Recent upgrades of 2 of my PC’s with bang-up-to-date motherboards, have demonstrated a need for USB ‘A’ socket headers, either to fit on a standard PC Component plate, or a spare blanking panel on the front of the PC. I’ve tried sourcing [...]

This instrument can perform a leakage current test on almost any type of capacitor in current use, including ceramic, mica, monolithic, metallised polyester or paper, polystyrene, solid tantalum and aluminium electrolytics. There are seven different standard test voltages from 10V to 100V, so most capacitors can be checked at or close to their rated voltage. [...]

This project  is a stationary linear barcode scanner made from an IR emitter and an IR detector. With the project deadline only weeks away, we decided to make a linear barcode scanner with photo-detectors instead. The operation of a photo-detector is very simple. Depending on the reflectance of the scanned object, photo-detector simply outputs different [...]

The speech recognition system was capable of recognizing four commands and could cycle through a simple play list of three songs.  The jukebox could turn itself on, begin play, move between tracks, and stop play all through user voice commands. In order to implement this design, Robbins and Saha needed to combine several different hardware [...]

Our project, in one sentence, is an orientation independent 3D LED display. We were inspired by various videos on youtube of similar cubes but also by the idea of creating an interactive 3-dimensional display. We built a 5x5x5 LED cube display and controller board which interfaced the cube to a Mega32 microcontroller. We can display [...]