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Simpleclock is an easy to assemble attractive 4-digit 7-segment LED display clock with temperature and alarm function. It is available in three display colors: Red, Blue and White. It comes as a kit of through-the-hole parts and can be soldered by any person with basic soldering experience. An attractive acrylic stand is included. [ ]

Ever been looking for your keys, and wanted to call them, before you realize that they are hideously analog pieces of metal? Or wanted to let someone into your house when you’re not at home, without having to lend them your keys? Lockitron was the solution that descended from hardware heaven – a device that fits over the lock on your door and that is controlled via an app. It raised $2.2M on Kickstarter but missed its original shipping deadline by 1.5 years, leaving its backers in a deadlock (pun!). Are you one of them? Stop glaring at your empty mailbox and channel all your frustration into making your own awesome smartphone connected lock – The Bean Lock. [ ]

This project is an open source (hardware & software) DDS generator, based on: smart TFT module, AD9834, LM7171 fast amplifier. Description The homemade function generator is a quite common project on the internet. We can find different ways to do it: - The quick & dirty way based on a DDS module bought on eBay - The analog version based on a MAX038 / XR2206 - The “clean” way based on a FPGA and a fast DAC (e.g. http://www.circuitben.net/node/14) - The software way (e.g. Arduino + R/2R DAC) From my side, I wanted a small one which could fits my needs without being too expensive. According to me, such generator should at least: - Be easy to use - Output a signal from 1Vpp to 10Vpp (+/-5V), from 0 to 1MHz - Have a low profile - Without electric hazard (shall work on a 12V DC) Tiny DDS - Open source DDS generator Project Schematic Choosing the DDS chip I first started to look for a cheap DDS chip on eBay; you have to be careful because most of DDS chips have only a sinusoidal outpu...

I got myself some UV-curable solder mask for my PCB workshop, and as soon as i got it, i discovered that my UV artwork transfer box is totally incapable to activate the UV paint and cure it. I began searching the net for powerful UV lamps, and then it hit me: Some months ago i uploaded a theory regarding the Cold and Hot cathode discharge lamps. During my research for these lamps i found out that they can provide directly visible light (lamps without internal coating), or they produce UV radiation. The lamps that produce UV radiation have an extra coating on their internal surface which glows when excited by the UV rays, thus producing light! [ ]

Lightning Source Lightning occurs in many parts of the country, usually during the rain seasons. Sometimes it causes death to people and animals, and destroys trees and buildings. Some understanding of the nature of lightning will be of help when dealing with related safety precautions. The friction between a rising, warm air mass and a falling, cold mass causes the air masses to be electrically charged. In order to rid of the charge, that is to discharge, a large spark flashes between them. This flash of light is the lightning. The heat caused thereby heats the air suddenly, causing it to expand with a loud sound. This sound is the thunder. Thunder and lightning occur simultaneously. But since light travels faster than sound, lightning is seen before thunder is heard. Sometimes the warm and cold air masses get charged very close to the earth. The mass closest to the earth discharges towards the earth. In this ease the lightning strikes the earth. It appears very bright and the thunder...