One Primary To Rule Them All? HANDHELD QCW Tesla Coil Ep5

Tesla Coil Primaries are a bit samey aren't they? All flat, conical or cylindrical spirals. Only one person that I know off has made a half donut....but not this way! In this episode we take the handheld coil in a new direction. QCWDRSSTC with a crazy primary. Whatever you do, don't breath the DiCHloroMeTHane..............thud.
WARNING: Thanks to @covodex516 down there for pointing out that the nitrile gloves I used in this video are basically useless for protecting against dichloromethane exposure. Quite ironic given the ending! Ooops....
#electroboom #teslacoils #stem #experiment #electronics #teslacoilgun #science

[@covodex516]

just a helpful tip from a chemist: your gloves do absolutely nothing against the Dichloromethane. It just goes straight through them, through your skin, into your body; just like all very non-polar solvents tend to do.

[@HexTheDex]

Thanks mate. You're absolutely right, I've added a warning in the description. Are there any gloves that would be suitable?

[@covodex516]

@@HexTheDex Yes and no - with good gloves, you'll find a list of various solvents and their gloves resistance to them given in form of time values called the penetration time - its the amount of time the solvent needs to diffuse through the gloves. With decent standard lab gloves and DCM, you'll often see penetration times around 30 seconds. There are gloves that can withstand for several minutes, half an hour or longer, but in the end, super non-polar stuff just diffuses through every single substance you could make a glove out of. Unfortunately, DCM happens to be carcinogenic as well, which means whatever expensive glove with super high penetration times you buy, you will have to throw them away after contamination. So as someone working with DCM on a regularly basis, my method is just not spilling it on myself. For things like DCM I usually use normal gloves because the thicker stuff ruins my dexterity, and aside from that I just switch them immediately after I get a smear onto my glove. Same with acids and bases btw - imo wearing gloves often even can be worse than wearing no protection at all, because I would notice a drop of sulfuric acid on my skin pretty quickly and could wash it off without it causing any damage, but when I don't notice it because I'm wearing gloves, I can smear it anywhere, including my face if Im not mindful. Things like DCM are a bit different story though. So I really don't have any special recommendation for you, I just wanted you to be aware that these gloves do not protect you properly and to work with the DCM accordingly. They're still better than nothing and the alternatives arent that much better imo

[@MrTopsfield]

Thank you for taking the time to reply as you have. PPE is last in the hierarchy of control and often taken for granted.​@@covodex516

[@ancientlink0]

Very good, waiting for more videos

[@HexTheDex]

Thanks mate. Yes plenty more to come :)

[@AndyGillham]

Excellent videos - nice one Uncle Dave - looking forward to the next one!

[@VIKEHV]

Awesome research!!! I wonder if implementing this at the top of my VTTC primary will make a difference...

[@Konstantin_.]

Cool project, I have some tips that might be helpful for you, before you make a QCW coil, are you sure that you understand the basic operations of a dual resonant SSTC? It’s crucial that you do, before moving onto a more complex design. I highly suggest improving your bridge design to minimize the most stray inductances as possible, at this stage you should also be moving onto using IGBTs, instead of mosfets like the IRFP250 you were using in your other designs, this is due to the nature of a DRSSTC, peak voltages and current can be multiple times that of a regular SSTC. I find this project very ambitious, I highly recommend you build a regular DRSSTC first, that might get you more used to the design

[@benjaminlockhart99]

Funny seeing people from styrocord here now.

[@HexTheDex]

Hello mate. Thank you for this. I agree and have just taken delivery of some new FGA60N65SMDs (some of the last available in the world it seems!) and will be going full bridge. But before that I plan to continue with the IRFP460 half bridge and test the coil with the LabCoatz schematic Staccato DRSSTC, with some rectified 240v mains input. Your advice to master DRSSTC first is excellent, however maybe charging ahead like a fool makes for better youtube?

[@Sir-Dexter]

nice lab and nice work

[@firefox1136]

Very nice work! This series is becomming more interesting with every episode and your fast progression is impressive. Best of luck on your journey and I cant wait to see your handheld QCW operate:D I think it is actually an advantage in this case, that you power it from 12V with a boost-converter, since you can probably just use the boost-converter itself to generate the high voltage ramp for the primary side.

[@HexTheDex]

Thanks mate! Your boost converter idea sounds interesting. Do you know anyone who has documented/implemented it? I'm currently planning to use phase shift for the ramp. I've got a design working in LTSpice but I don't know if it'll work in reality. Would be good to have a backup plan!

[@firefox1136]

@@HexTheDex Interesting approach, I don't think I have seen anyone use phase shift before. Regarding my boost converter idea I don't have a direct documention of someone doing it, but you may be able to regulate the output voltage of your boost converter by adjusting the on-time of it's squarewave. You could start at almost 0% and then ramp it up to 50%. Doing that should ramp up the power and thus also the voltage, assuming that the load on the converter is constant. Alternatively loneoceans has another article on QCW coils (they're first one, the QCW DRSSTC1), which contains even more useful info than they're tinyQCW. There they used an asynchronus buck converter controlled by a microcontroller to generate a ramped bus voltage feeding the DRSSTC. Lot's of useful info there in my opinion. Hope this helps/gives some more inspiration and good luck with your coil:D

[@character640p]

121th subscriber.

[@zoeyzhang9866]

Don't know if any custom PCBs/3DP'd part can help for upcoming project ideas? We're open to sponsorship! (PCBWay zoey)

[@c567591]

I'm curious after looking at the magnetic plot, why not roll the doughnut in towards the secondary and get a better magnetic flux on it? ( Meaning roll the outer edge in)

[@milogonzalez1334]

only one? this is like a poor man's rodin coil or a poor man's vortex coil good work tho i'm just a hater

[@HexTheDex]

It takes all sorts ;)

[@milogonzalez1334]

@@HexTheDex in pursuit of diversity in design, make a bifilar version :p