Here’s one more use for the insanely handy LM555 chips. [Terry] put together a Tesla coil tuner around one. The 555 is used to generate a range of frequencies while a simple double LED arrangement indicates the presence of an output spike from a coil due to the resonance.
The video above is ArcAttack! playing the classic “Popcorn” through their signature Tesla coils. Solid state Tesla coils (SSTC) can generate sound using what [Ed Ward] calls pulse repetition frequency (PRF) modulation. The heat generated by the plasma flame causes rapid expansion of the surrounding air and a resulting soundwave. An SSTC can be operated at just about any frequency, so you just need to build a controller to handle it. The task is made more difficult because very few electronics are stable in such an intense EM field. [Ed] constructed a small Faraday cage for his microcontroller and used optical interconnects to deliver the signals to the Tesla coils.
[via Laughing Squid]
[Richard] took another shot at his battery powered tesla coils. He sent in his latest hand held plasma gun. He modified his battery powered tesla coil to work as a handheld. He added a large copper pad to the drill handle to couple the RF ground to the human
torch holding it.. Sure, we’ve seen plenty of tesla lately, but who here wouldn’t want one? (Maybe the guy in the server room…)
All the parts needed are listed – just be sure you fully understand everything before you get into this one.
I made it home after a long day of travel. Airport security let me through with my new home server – a 1U dual P3 800Mhz Compaq rackmount that I scored from the guys at UNIX surplus. Yes, it was my carry-on personal item.
[martin] tells me that the Pentax k10d firmware has been hacked for polish menus. I’ll let you guys sort through it, I’m honestly too tired to deal with translating it right now.
[Alex] re-cased a macbook power supply to repair a slightly ripped out power cable. Those power supplies aren’t cheap, so it’s worth noting.
By the way, I’ve got one of the midnight research wicrawl CDs, so ask nice if you want me to put up a torrent.