Two models will be shown, one full-wave rectified and the other a half-wave rectified negative ion ionizer. Featuring an optional fan on the full-wave model.
Benefits of negative ions supposedly include
• freshen and purify the air
• help lift mood
• alleviate depression including winter depression(SAD)
• eliminate most tiny particles suspended in the air (indoors)
How to Make a Negative Ion air ionizer – [Link]
This is a high power switch which can be used to switch almost anything. It is designed to enable / shorting large capacitor banks for maximum energy transfer. Applications: Can Crusher, Disc Launcher, Rail Gun, etc.
High power pneumatic switch – [Link]
As soon as I heard about the 555 timer contest, I knew I had to come up with something inspiring! My buddy Jay recently introduced me to Nixie Tubes, and I thought… hmm, how can I use a tube and the 555 timer? I noodled on it for a while, and ultimately came up with the notion of a KEYCHAIN! Simple really, take the smallest Nixie Tube that displays digits, and make it display a ’5′ in the smallest package possible and put it on a keychain. That was the idea… and it took quite a journey to complete.
A Nixie Tube Keychain – [Link]
“The MakerFaire hackerspace ran out of challenges, so they rigged a Kinect up to a pair of Tesla coils. On a whim.” — Ben Kidd [via]
Hacked Kinect controls Tesla coils – [Link]
Welding with a buzz-box (AC arc welder) is much easier if you don’t have to scratch-start the arc. A high-frequency start circuit puts a high voltage (AC) in series with the low-voltage high-current welder output. Then, when the welding electrode is brought near the work, the high voltage (HV) ionizes the air and creates a path for the low-voltage and high-current arc.
High-Frequency Start Box – [Link]
This project is a high voltage plasma speaker that is using two mosfets in half bridge to drive the flyback transformer. This reduces the load on the FETs, and thus reduces the heat produced by them. To find out how plasma speakers work see the bottom of this page. [via]
A reliable Plasma speaker - [Link]
This project is a VU meter using 14 IN-13 bar-graph Nixie tubes. The producing effect is really nice. Each of the tube is connected on driving circuitry that include bandpass filters of 60, 150, 400, 1000, 2500, 6000 and 15000kHz pass. Then each filter output is converted to DC and converted from logarithmic to linear scale suitable for Nixie tubes.
Nixie VU meter - [Link]