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MAKE Blog 

Mac mailbox

Mac mailbox from Te Atatu in Auckland...

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LHC tweets its first circulating beam of 2009

LHC tweets its first circulating beam of 2009, good luck finding the Higgs gang. Photos here...

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Building a shop presence notification system

As a member of Hack Pittsburgh, our local hackerspace, one thing I've wanted to know if anyone else is there before I make the trek over. Well, so did Andy Leer and Marty McGuire, so they decided to build a shop presence notification system. They reasoned that they could measure the ambient light level to determine if someone was around, because people tend to turn on the lights when they show up. With this in mind, they hooked up a photocell to a donated iobridge module, and had a notification widget up on the website in record time. Excellent work!

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Vacuum tube prototyping board

Bruce Heran made this prototyping board for his tube projects. He writes:

This is a project that I made to take care of an ever increasing need to prototype vacuum tube (valve) circuits. As you can see from the photos, it really is a test "board." I do a lot of work with tubes and love to design and improve circuits. In the process I often use various CAD type programs to rough out the designs. I have frequently found that the models do not agree with the final build. Some are right on, but most are off enough to turn a good idea into a waste of time. Thus the need to quickly prototype designs. Now I could have created this board with many additional features - speakers, output transformers, LEDs... But what I needed was a simple way to test single stage tube circuits. So for simplicity I wired the tube pins together (pin 1 to pin 1 and so on). The leads from the pins are brought out to terminals on a "Euro" style terminal strip. I included several other "Euro" strips, a pair of RCA jacks, a 100 k-ohm variable resistor and solderless prototype breadboard. This solderless breadboard is available in various sizes from several sources. If you build one of these boards, feel free to use the idea to adapt it to your needs and use whatever parts you so desire.

[Thanks, Gio!]

DIY Vacuum Tube Prototyping Board

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Free LED Cookbook from TI

By way of Andrew Q Righter of HacDC comes word of this free PDF from Texas Instruments, a 41-page "cookbook" of circuit designs and application notes for TI's LED-related components. [Thanks, Andrew!]

LED Reference Design Cookbook [PDF]

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