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a photodump of happenings at MITERS lately
a lot. (you can’t tell really tell it now. people, clean up after yourselves!)
we even threw stuff away!
we fixed the “MIT Sloan School phone” that people can use to call MITERS to be let in after daylight hours
(well, as of 1 april 2013 it broke again and is super quiet… if you amplify it up to be audible you also get a lot of buzzing noise. to be fixed)
Mars built new ventilation for our welding area
also there was yurt building
it disassembles into something amazingly small and portable
that’s all. oh, by the way, the future is going to be awesome.
Some Friday night high-speed photography fun.
Introducing my first DRSSTC. It’s a small tesla coil made to be portable and to make lightning at home. This coil is based of the amazing oneTesla pcb. I’m still in the process of doing a detailed write up at http://www.loneoceans.com/labs/drsstc1/!
As a learning experience, I wanted to go for something simple and nothing too fancy. I’ve had the fortune of being in the good company of other brilliant coilers (like Bayley, Tyler, Kramnik), and managed to get an older version of the oneTesla driver PCB, which runs this coil! I faced a couple of problems over the past few weeks but I’ve modified some parts and managed to get the coil working very well! See the video of it in action here:
Performance has been pretty good. Originally, the coil used a 0.068uF 940C capacitor but that made my primary frequency about 19% too high and I lost a 60N60 half bridge. Increasing the primary to 8 turns of 14AWG (k=0.26) turned out to be a bad idea and I had a lot of racing sparks. After a few more coats of Polyurethane on the secondary, a return to 6 turns of AWG14 and a larger tank cap, the coil is in tune with a performance I’m very happy with.
This coil currently has a tiny built-in 19VDC laptop power supply for the electronics which uses the famed UCCs from TI as gate drivers to a GDT driving the gates of the IGBTs. Here’s a pretty photo of the ground ‘lighting’ strikes of the tesla coil:
23 Feb 2013