Giovanni Militano writes:
One of the advantages of hosting a hobby website is that you meet people through email who have similar interests as you. Ever since we posted Bruce’s first OddWatt project on the site I have communicated with a number of DIY hobbyists who have built the various OddWatt amplifiers and have had nothing but very positive comments about the sonic qualities of these tube amps. The kits are available in two versions, KT77 rated at 15 watts and KT88 rated at 25 watts which I decided to try.
5751 SRPP / KT88 Monoblock Tube Amp Kits - [Link]
This is an Arduino-Based Stereo Audio switch which can be controlled over a LAN using a web browser.
Peter at solderintheveins.co.uk writes:
Use a 5v DPDT relay, a few 3.5mm stereo sockets and an Ethernet-capable Arduino to create a simple audio switch which would allow me to switch one audio source (my PC’s Soundcard in this case) to one of two outputs (headphones or speakers) via a web interface running on the Arduino from the comfort of my web browser.
Simple LAN Controlled Stereo Audio Switch - [Link]
What is Fritzing:
Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to take the step from physical prototyping to actual product. Fritzing is essentially an Electronic Design Automation software with a low entry barrier, suited for the needs of designers and artists.
Currently there is a special Christmas offer. You send them your Fritzing-made pcb layout and (if your design is selected) they send you back two copies of your project. That’s a “Fritzmas” present! Visit the offer page here. Check out some projects designed with Fritzing.
Fritzing: from prototype to product - [Link]
Researchers from Helsinki University of Technology (Finland), University of New South Wales (Australia), and University of Melbourne (Australia) have succeeded in building a working transistor, whose active region composes only of a single phosphorus atom in silicon. The results have just been published in Nano Letters. [via]
Researchers discover single-atom transistor – [Link]
In this project “annacegu” intergrates the 4D TTL camera functionality onto the uOLED-xxx-G1(GFX) series LCDs. Apart from as a normal camera, it has various uses, such as a video intercom, a baby monitor, or as part of a security system. Check more details and .4dg file on the link below
uCAM demo with uOLED-xxx-G1(GFX) - [Link]
Knut Karlsen at blog.bareknut.no writes:
At home i always have some batteries lying around, either rechargeable or normal ones. Usually they are empty, but i’d like them to be always fully charged. I could use a normal charger and there is a lot of solar devices that charge rechargeable batteries. I wanted it simpler; why hasn’t anyone made a battery with integrated solar cells? The idea of the “SunCat” batteries where born.
Solar cell batteries - [Link]
We set out to build a 100% DIY, scratch-built digital picture frame. Our frame has a 12bit color LCD, gigabytes of storage on common, FAT-formatted microSD cards, and you can build it at home. We’ve got the details below.
Digital picture frame – 100% DIY - [Link]
Display on QVGA 240×320 pixel using AVR small 8 bit microcontroller
Build photo frame with AVR and BL-TFT240320PLUS - [Link]
This is the second version of a homemade CNC machine build using mostly off the shelve parts. The first one aka “The beast” had a lot of precision issues due to play in most parts which in turn was caused by mostly bad cutting. Also one of the biggest problems was that when I have build it I did not think to allow later adjustments to be done. So this time almost every part of it allows for some adjustments. It is also easier to build due to the different design. [via]
$100 Arduino based CNC - [Link]