Hi everyone,

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:

Important specifications including calcs from JavaTC:

  • Max spark length – I don’t know yet, does >22″ sparks to free air and ground with ~100us on-time. More testing to come soon. Right now it’s limited by hitting the floor.
  • 222kHz resonant frequency (within 1%)
  • 2.4″ Diameter PVC Secondary, ~2000 turns of AWG36 for a 10.25″ length
  • 3.5″ Diameter Acrylic Primary, 6 turns of AWG 14 for about 0.8″ length
  • Single 0.101uF 2kVDC 942C CDE Primary Capacitor
  • 340VDC (120VAC rectified and doubled)
  • Roughly 100us on-time (in the photos here)
  • 2.2″ x 8″ AmazingOne spun toroid
  • Half Bridge of 60N65 IGBTs (seems to be similar to the 60N60 TO247 IGBTs)
  • Coupling = 0.22
  • Energy Transfer time = 9.87us

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:

Best Wishes!

 -  Guangyan
    23 Feb 2013


Harlem Shake, Tesla coil edition

Harlem Shake + Tesla coils at MITERS! http://www.youtube.com/watch?v=kMQltc7uIKI

Harlem Shake [Tesla coil edition] @MITERS
Do the Harlem Shake! http://miters.mit.edu/
Nippon TV rides chibikart!

Japanese TV Visits MITERS!


The semesterly MITERS End-of-Every-Term Research Showcase (MEETERS) was tonight! About 20 to 25 people were in attendance throughout the night, projects were demonstrated and presented, and pizza was had by all.

Does this page make my butt look big?
IMPORTANT!! Fledgling engineers need our likes & shares!
"Stop Gender Discrimination" = common sense (moar common some places than otherz)
"In" = odd preposition choice (makes sense in the local parlance)
"VIT" = Vellore Institute of Technology (in India)

Stop Gender Discrimination In VIT
"Women are confined to VIT hostels FIVE HOURS EARLIER than men on Saturday and Sunday." How is that fair??

What is a MITERS?

Hullo there!
A lot of things have happened since August. Two particular things of note have been seminars and maker faire (oh, and NHK filming, but more news about that’ll come out in a few months). I was going to write blog posts on these topics, but then I realized to explain the history of the seminars, I would need to dig deeper into the past.

hi rather outdated fall seminar series flyers

what is a miters

To clarify why I’m writing this blog post, I’m currently the president of MITERS, but not for much longer, and I want to record my thoughts. Officers are elected in the spring term to provide continuity from one “generation” of officers to the next, so the outgoing officers, if they are seniors, have a chance to relay their knowledge. So I’ve been president since last February, and my term is coming to a close soon.

In early March of this year, I called a meeting to flesh out what I wanted to do during my term as dictator. After some discussion I got a consensus on what exactly MITERS is about vision-wise (it was pretty different from what I personally thought it was about). Of course, what MITERS is about is entirely what we decide as a community, so this may or may not hold true next year. But for my term…

MITERS draws people in because of our fun / crazy projects. We are a student group promoting making things for the fun of it.

Hold on. Wait. There’s a prequel to explain how, exactly, a seminar series fits this vision.

intimidating MITERS?

In late December of the previous term (when muffin was president :D ), I’d sent out this survey to all the MIT dorms. My goals as president came almost directly from insights gleaned from that survey.

Like the seminars, the issue of how MITERS is perceived is a subject near and dear to my heart. I first heard about MITERS when I was a wee prefrosh at CPW. I’d heard about LED’d prom dresses and decided I wanted to do that too, but I didn’t have LEDs and I didn’t know how to turn them on. I asked my host where I could find them, and that’s how I first came to MITERS.

Sun, Apr 19, 2009 at 2:43 PM
Hi hi,
Thanks so much, I was able to swing by and grab a lot of LEDs. Err, like 12. It was sort of awkward b/c I just randomly dropped in, and I left before saying thanks .__. If you see any MITERS people, please tell them the random prefrosh said thanks a lot! And that I’ll return the favor in half a year or so.


Muffin was the first person I talked to at MITERS, I think. He attempted to show me how an LED worked, but the battery was dead. I forgot what else happened, but I left shortly thereafter.  (also, I didn’t figure out / have enough time to LED my prom dress ~__~).

In fact, Amy and Charles (also former MITERS presidents) both lived on my hall, and yet it definitely didn’t stop feeling awkward hanging out there until a year later. If they hadn’t lived on my hall, I probably wouldn’t even have stuck around long enough to overcome that initial awkwardness (common to any close-knit club you join). I didn’t really start hanging out there until the year I took 2.007 (second semester sophomore year, spring 2011) and was working on a hexapod and “had a project to work on.”

hi hexapod <3 back before I broke your servo controller and lost one of your legs ;___; uweh

Also, holy crap, 2011. That was last year. o___o?! Well, to be fair I’d been filling out forms for MITERS for a while before then.

Where was I going with this? Right. I definitely found MITERS pretty intimidating and informally felt that many people felt the same way. So I did the survey thing! There was interesting data even if it’s likely in that so-unscientific-it’s-worse-than-not-doing-a-survey range of misleading. Here are the results from the main question in the survey.

Shiny graph summaries

The question:

Were you ever intimidated by MITERS?
“whoa these people are so awesome, it’s so awkward when I ask n00b questions, etc.”

  • yes, but now I hang out at MITERS
  • yes, that’s why i don’t hang out at MITERS
  • no

So actually I’m always concerned about gender issues, and (and yes, there was a “neither” option for gender, but there was only one response for that category) and that was the main hypothesis driving my creation of this survey. Here are some gender-based results:

Conclusion: A lot of people (who have heard of MITERS and responded to this survey) find MITERS intimidating. And it does appear that females are more likely to be intimidated than males.


Quotes from that same survey

I also found the answers to the “what else” question quite elucidating. They form the main basis for what I aimed to achieve as president.

In particular, here is a selection of quotes: *

~ i was just sort of intimidated at the beginning of the year. in general, I was asking around if I could help with projects or get some help starting mine. however the response I was getting was generally that I should start my own project, which is sort of intimidating for a freshman with limited design experience.
~ Mostly it just wasn’t super welcoming – walking in you’re mostly ignored which can be intimidating for a new person. Its totally fine now that I know some people though.
~ I’ve gone to MITERS before, and sort of been at a loss for what to do. Not intimated, per se, but just sort of confused.
~ MITERS is full of super-competent types who are all working on their own projects. It feels like a place that you go once you have experience, not to screw around and make mistakes while you’re learning. It’s hard to feel like you can do much, or that you belong there, when you’re flanked only by people who have built ridiculous robots, and you’re the only noob

*I’m doing this unethical thing where I said I’d only quote people to keyholders, but I’m making the executive judgment that it’s been sufficiently long ago and the answers completely devoid of identifying information that a few quotes will be a-okay.

Neglecting whether we should INVITE ALL THE EVERYONE EVER to already-extremely-disorganized thing that is MITERS, I, from my own personal agenda, was all I FEEL FOR YOU ALSO I’M GLAD I’M NOT THE ONLY ONE. :D So then I dragged the rest of MITERS along.

Okay I am getting more sleep-deprived as I write this post.

The main conclusion was that build parties were not really helping new people feel more comfortable at MITERS. At a general meeting, we decided that we should revamp build parties and try to make them more welcoming, for instance by having a kit project that seedlings could work on and having an group introduction sometime during the night so that people could get a better sense of what was going on at MITERS.

what is a miters pt2

In late May I did a recap of things I wanted to happen during fall term.

Encourage more individual crazy / fun projects at MIT.

Have more people know about MITERS (publicity)
Have more people become keyholders (non-intimidating)

Task list:
~ publicity

Project grants
Stickers and t-shirts
Seminars (share generally useful skills)
Lightning talks (present your own work)
~ non-intimidating
Seminars (for an hour, replace build parties with introduction + seminar)
Project Class (easy project for frosh to work on)

The basic idea was that we wanted to make sure people who wanted to come weren’t prevented by being intimidated, and professors and administration better knew what we stood for.

1) The project grants worked out o.k. We kept it to non-MITERS people. Mostly the grantees got hosed and didn’t finish their projects, and/or only came to MITERS to pick up their parts.

2) The posters worked out great. Alex postered and then we forgot about it. X___x i should get that going again this semester. yay thanks timyang and atw.

3) We never got around to having a kit project that seedlings worked on at MITERS. Instead, we implemented

4) seminarrrrrs

So, finally we come to the topic of seminars. Of course now I am tired and so the part about seminars will actually be really brief.

I started them last semester, a bit informally. They were relatively sparsely attended and were just random topics people volunteered to talk about.

Elaina: “eagle: things i wish i knew when i started”

This semester, we actually organized a series of topics.

As you may have heard, we are running seminars this semester. This is to un-intimidate new people and should serve to make us better known for all the awesome we are among The Real People (profs, administration). The overall theme is “learn about microcontrollers.”

Amazingly enough, somehow each seminar has happened. For disorganized MITERS, this is pretty impressive. @___@


In terms of actually fulfilling the goal of welcoming people to MITERS, the main issue is that, to accommodate more than ten people, the seminars are held upstairs on the third floor (thanks IDC!) of the same building. However, people seem to be just treating it as a class so far. In general is fine (more people should be introduced to building things for fun!), but perhaps we need to be more explicit that part of the point is to get people to feel comfortable hanging out MITERS. Many people never even see MITERS. x___x so I will be trying to fix that in the upcoming seminars. Some possibilities:

  • have food on at MITERS to lure people back down afterward
  • give a short presentation on MITERS and why we are running this series at the beginning of each seminar

Some pictures

Actually, this post began as “I should share the picture I took of the seminars!” And so, finally, we are here.

Seminar 1: 555s! We had people make blinky LED circuits on a breadboard.

I taught the first seminar, and Peter helped actually make it not fail.

Lots of people!

A closeup of a circuit-in-progress.

Seminar 2: 555s again. Bayley taught it this time around.

Ah, debugging. The greatest of skills.

Seminar 3: Solidworks 1 (parts). Charles taught this using his 2.007 TA experiences. They modeled motors and learned to use calipers as well.

Charles: If there are any blue lines (unfixed dimensions), I will give you zero points.

Seminar 4: Solidworks 2 (assemblies). Charles taught this too.

Seminar 5: Eagle 1 (schematics). Dane

The next one (today) will be taught by Dane and will involve routing and ordering boards. We’ll actually be combining all the boards people make into one board and ordering them thanks to support from advanced circuits.


MITERS! We are friendly, and you should come help MITERS be more awesome. Also you should build things regardless of whether it’s at MITERS or not :)

Additional thing which I learned:

  • print out circuit diagrams (e.g. 555s, resistor values, the eagle schematic)
  • good idea to have a working circuit example as well, and to organize components into kits
  • get the seedlings themselves to sort out the components after they are done with them :)
  • just abuse jumpers, don’t bother stripping tons of little wires for people
  • don’t forget, 555s can run off of battery packs. for a long time i was trying to figure out how to run power lines from power supplies to dozens of people… derp.
  • get a bright projector! kind of expensive though
  • lots of TAs crucial — helpful for TAs to have some idea of what the seminar will cover beforehand
  • definitely useful for TAs to proactively wander around and ask people if they need help — not everyone will immediately raise their hands to ask for help
  • people will show up on a Friday night even without food or getting any sort of course credit
  • holy crap lots of people will show up
  • rsvp less crucial than you might think (seminars can be repeated, not ideal but people can be put in groups, software sessions can be fairly flexible enrollment as long as you have lots of TAs)
  • take lots of pictures!
  • make sign-in sheets, they will help justify any funding requests
  • provide really really detailed instructions for installing software to eliminate any uncertainty
  • expect that some people will show up without installing the software regardless. try not to be too exasperated
  • hand out link to feedback form on slips of paper or at the seminar, people will forget if you just email out

Yay! That’s it for now. The next installment will most likely cover our trip to Maker Faire NYC.  Actually, this has been covered by expert bloggers Shane and Charles already, so I might not write this post. *scratches head* Otherwise, I might just do biweekly updates on the happenings at MITERS. Like swapfest parrots.


TMRC Halloween? http://www.youtube.com/watch?v=8PCp5xk-9Qo&feature=youtu.be

Pumpktris is a fully playable version of Tetris built into a pumpkin, with 128 LEDs for the display and the stem serving as a game controller.
Did I ever tell you about how I was the first person on all of facebook to like MITERS?