Prototyping circuit designs are usually needed even after a circuit design has been developed in conjunction with a circuit simulator. Bruce Heran built this Vacuum Tube Prototyping Design Board to allow to test designs quickly and easily.

"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."

A simple game is always much more fun when it is spiced up with some cool electronics. The wooden tilt maze game has been around for a long time. This Marble Maze that is Remote Controlled using an Accelerometer kicks up the original game by allowing the player to interact with the game using a controller that moves the real game according to user movements. Have a look at the project build details for all of the issues that were found during the construction.

Via: Trossen Robotics

"To control the servos I used a BOE development board with a BS2 microcontroller from Parallax along with a Memsic 2125 dual-axis accelerometer as the controller. The addition of the maze transforms this project from a electro-mechanical thing-a-ma-jig to an exciting hands-on game. For this project I choose to build a maze myself using balsa wood. This would allow me complete control of the maze difficulty and dimensions and also ensures the weight is kept to a minimum. I also found wooden balls to serve as the "marbles" for the maze. It just so happens that these balls and the balsa wood walls make a fun "thunk" noise whenever they collide."

This video shows how the common pole transformer is made. Overall it is a simple process. If you can get one of these you could also have some dangerous high voltage fun. The video below shows how a transformer works.

In College I remember rifling through my now tattered yellow Texas Instruments TTL Reference Book. Texas Instruments has been constantly developing interesting products and is holding an event called eTech Days where they will hold a number of online technical training sessions. It is going to be held tomorrow (November 17th), so have a look at the lineup, register and enjoy some interesting sessions tomorrow. I am looking forward to checking some of them out and hope to see some of you there!

Via: HG Forum

"On November 17th, 2009, please join us to interact with experts from Texas Instruments, TI Developer Network and the open source community, in technical training sessions and in the E2E Community forums. A full schedule can be found below, and see the Getting Started links to the right. Click here to register for the live training and we’ll see you on November 17th.
To participate in ‘Office Hours’ on the E2E community forums, click here to log in, or if you aren’t an E2E Community member yet, sign up for an account."

PyroElectro has built an interesting motor Optical Motor Encoder system that allows a sled to move back and forth using optical feedback to know where the sled is. A L298 DC Motor Controller is used to drive the simple DC motor that is used to precisely position the sled. You may remember this CD-ROM Read Head Actuator Head Scratcher article from earlier in the year where I was wondering how a simple DC motor could be used to precisely position a CD-ROM read write head.

"The goal of this tutorial is to create a way to know where the ’stage’ is, accurate to about 1/4” using optical encoding. The stage is controlled via a 12v motor so we will use an L298 motor controller for controlling the motor via a 18F4520 PIC. The PIC will use hardware PWM generators to output the correct frequency & duty cycle. The PIC will also take the analog input from the IR detector diode to keep track of how far the stage has moved via an internal analog to digital converter (ADC)."

Music selection is usually a boring process. It usually involves some common interface such as scrolling through titles on a portable player, using a remote for your stereo or a mouse on your computer. With this RFID Music Selection called the RFiDJ from Roteno Labs music is represented by tiles and the tiles graphically represent the music that can be expected. I can think of lots of opportunities for developing this much further into a very immersible system. Have a tap sensor so that a tap on the tile will play the next randomly selected song by that artist. I think having this at a party and have a system where guests can add their favorite song to a playlist is also something that would be very interesting!

"The RFiDJ project is my first attempt at an application in Imperceptible Computing. After work I like to listen to music/radio for a bit to unwind. This usually involves logging into my HTPC and selecting a playlist. For this project I attempted to change how I interact with my music and HTPC. Using RFID tags and photo frame coasters I am attempting to simplify the interface to my music."

Morten Bentsen, a 17 year old from Norway made a system that would show him the quality of his internet connection at a glance. If you are into online gaming this could be something useful.

"I recently made an indicator to show the status of my internet connection. It consists of a small VB.net application, which pings a certain site with a set interval (both user-changeable, and sets the DTR-pin of a serial port (port name is changeable) depending on the ping-answer. The DTR-pin goes to a small mosfet, which controls a small telecom relay. The relay is switching 24 volts to the LED-panels this is great for LAN-parties, because the participants can easily see if they are the only one who dont have internet, or if the whole party has lost it. There is one problem though, when I watch videos at youtube, the lights are blinking, because youtube is using all my bandwidth. (yeah I know, my internet connection sucks :D)"