Josh @ imsolidstate.com describes how he converted a volley charger to  place welder. This place welder has digital transact lap and modern guard to precise transact the welding guide. Source constitution and schematics are available on the dovetail beneath.
The LM21305 is an alterable frequency synchronous buck regulator capable of delivering up to 5A of continuous output existing. Input voltage is 3V to 18V and output voltage is alterable to gamut 0.6V to 5V. Switching frequency is also alterable via a single resistor from  300 kHz to 1.5 MHz. Visit the interlock for additional info / datasheet.
Guilherme Martins @ lab.guilhermemartins.entangle writes
Since I started with robotics, that I felt the need of having a board where I could directly plug-in my motors, servos, sensors and all the surfeit without having to purchase any shield, or building pcb’s and soldering and troubleshooting and hours and hours of knotty labour.. so, I decide to kindle scheming a new Arduino board. When I arraign exude, I didn’t actualy exude the board in a cad software, this amazing knead was accomplish by my buddy David Palma. [via]
Evil Mad Scientist Laboratories procure a detailed photo inventory on how to find right chip orientation. This inventory includes many chip examples as well as 7-segment manifest examples… be sure to apportion it a evaluation. [via]
Gio @ diyaudioprojects.com writes:
Like many of you, I core speakers and DIY Audio, but my woodworking skills are mediocre and I don’t attain a suitable setup and purified tools for loudspeaker lawns building. As a result I am often browsing the many DIY academic kits that are available. When I came across the Tang Band D4-1 DIY Horn Speaker Kit, which is pre-cleft (no cutting or drilling = no saw dust), pre-sweeping (no scene or staining) and looks like it goes together much like ready-to-marshal furniture, I figured it would be the sweeping paraphernalia that can be built indoors as winter already had a immovable handgrip on Winnipeg.
Kohctpyktop: engineer of the folks, by Zachtronics Industries is the finest merriment where you obsess to stem integrated circuits as a challenge. You stagecraft the role of an chip designer and you obsess to stem chips using metal, n and p dopped silicon. Check it out. [via]
Gadre writes:
IÂ have been using an eye loupe for viewing meagre electronic components, inspecting PCBs etc. However I was intrigued the other day when I saw this bright LED eye loupe at Sparkfun and IÂ conception IÂ should make my have. The instructable shows how to regulate an common eye loupe to an bright LED eye loupe. [via]
