Here is a simple design for a DIY metal detector that uses a beat frequency oscillator. “BFO ( beat frequency oscillator ) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the
Just a reminder that the Comment Contest is ending soon (March 31), up for grabs is a one year subscription to Nuts and Volts, one of my favorite magazines. If anyone has a prize suggestion for future contests please leave a comment, I would love to hear about it.
So you have a PC toaster but now you need a deep fryer. Have a look at the Deep Fryer PC for some inspiration. “Got a PC, but forgot to buy a Deep Fryer for that weekend party? Fear not! There is a solution! Just grab that high-end PC, stick it in a bucket, fill said bucket with oil, and play a CPU intensive game for a little while. In
Here is another cool video of a Nintendo Wiimote controlling a robot. Video after the jump. “Control a LEGO NXT mindstorms robot with your Nintendo WiiMote and a S60 3rd edition phone.â€
If you have a big enough back yard, you too could build your own wood roller coaster just like Jeremy Reid has done. Here are some other to have a look at: Link 1 Link 2 Link 3 Video after the jump. “Style: Out and Back Height: 17 feet First Drop: 20 feet Top Speed: 20 mph Track Length: 444 feet Max Positive G’s: 3.5 Max Negative G’s: -0.2 Material:
This Van De Graaff project allows you to play with high voltage on the cheap. “The base is an old laundry bucket , inverted. Lay the power roller and motor on top of the bucket and mark the location of the mounting holes and roller location. Using those markings locate the closet flange and mark it’s mounting holes and the area inside to be cut out. Cut out the hole
It is hard to believe that this trike machine was built in 10 days. “All parts copper plated. Engine hand engraved. Reversed handle bars. Internal throttle and clutch. No downtube with triple top tube. hand made fuel and oil tank combined in one. Hand made seat. Engine fully modified with Screaming Eagle parts. Upcoming Discovery biker build off participant. Built in 10 days!” Via: Brass Goggles, Quelli-della-Mala and The Kneeslider
