Posts by skyguided@cathode.church
 (DIR) Post #AfRA6rxSIMMyZdUWQK by skyguided@cathode.church
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       still not the clean sine-wave I'm hoping for, but better.
       
 (DIR) Post #AfRA6uQF8IaMDUyXZY by skyguided@cathode.church
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       ...not the exact capacitors I have installed, but similar.Using a bank of only three is *definitely* asking too much, even if I think things aren't quite as bad as 300°C/W. Note the log scale on x-axis.
       
 (DIR) Post #AfRA6xxfyS6xC3dmbI by skyguided@cathode.church
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       Sincerely though, does anycritter have ideas on why the two-turn 1.9uH PCB coil gets so dang hot? According to the saturnPCB calculator / IPC 2152, I'd expect less than 30°C rise to steady-state even taking skin effect into consideration, based on my ltspcie sims expecting ~12 peak amps at ~13MHz (sinusoidal). I see like 70°+ temperature rise within a minute. Guessing there's something going on with inductor energy getting dumped as heat, so resistive load calcs go out the window. But I have no idea how to reason about those possible effects.
       
 (DIR) Post #AfRA70NH0Fm6g1dFmC by skyguided@cathode.church
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       ...I suppose the board is taking like 40W input so clearly the power needs to go *somewhere*. I was hoping that most of the somewhere would either be making the xenon get all bright, or else drifting away as legally iffy radio.
       
 (DIR) Post #AfRA72rpjbPOPNwggi by skyguided@cathode.church
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       lol so ended up just using I^2 *R just given DC resistance of a few tenths of a ohm and amperages in the 6-10A range...that's multiple tens of watts of heat.Very rough estimates of thermal mass give many degrees per second rise. ...yep there's a problem.So the standard trace width calculations just aren't remotely applicable here apparently!
       
 (DIR) Post #AfRA75WfqjGWed4Kci by skyguided@cathode.church
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       I now slightly better understand why other folks haven't used PCB inductors here. I suspect I might still be able to donut with much lower amperages though! If I get down below 3A in the inductor, that's only like four watts heat rather than dozens.
       
 (DIR) Post #AfRA77y2lwLaE5tDYu by skyguided@cathode.church
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       Here's a li'l gif of my inductor coil trying very hard to burn itself to a crisp. Spot-point temperatures come on-screen near the end.
       
 (DIR) Post #AfRA7ASxTyGRyYMw1g by skyguided@cathode.church
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       ~130°C in about 30 seconds.
       
 (DIR) Post #AfRA7CtyQV3vWv1XPc by skyguided@cathode.church
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       writeup updatedhttps://hackaday.io/project/194683-plasma-toroid-sky-guided-pcb-edition/log/227533-i-would-like-my-circuit-to-not-cook-itself
       
 (DIR) Post #AfRA7FwD8ddOwj5roe by skyguided@cathode.church
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       More progress on the plasma toroid! More videos! Less overheating!!Writeup at https://hackaday.io/project/194683-plasma-toroid-sky-guided-pcb-edition/log/227790-tweakinHigher-quality vid at https://www.youtube.com/watch?v=rEc76ckTJcg
       
 (DIR) Post #AjYnYDsA62I5S65K76 by skyguided@cathode.church
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       Oopsie whoopsie! Our very important Business Company suffered a data breach but it's the fault of a sub-sub contractor so you're not allowed to be mad.For security, we recommend changing your home address, social security number, and date of birth. Thank you for your understanding ☺️
       
 (DIR) Post #AlMIn8WsuNM6LjHANU by skyguided@cathode.church
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       UPDATE:I've finally released KiCAD source files for the plasma toroid driver.still need to flesh out documentation.https://hackaday.io/project/194683/files
       
 (DIR) Post #AlMIn8iEECQguuaE3k by skyguided@cathode.church
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       and I don't think I'd actually posted the full schematic here yet :3
       
 (DIR) Post #AlMIn8qNjsx3KCOjlg by skyguided@cathode.church
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       (feel free to roast)
       
 (DIR) Post #AlMIn8xpICuFhHsgN6 by skyguided@cathode.church
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       video status is: still need to shoot one more bit of pick-up footage, do a bit of polish on graphics, finalize the edit, sound cleanup, color grade. So coming a lot closer to done, at last.
       
 (DIR) Post #AlMIn95cpD925TWuWm by skyguided@cathode.church
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       the actual dang build was done in like, May.
       
 (DIR) Post #AlMIn9DQMDNoTfB8gS by skyguided@cathode.church
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       AND IT IS DONE"A plasma toroid for the modern era."https://www.youtube.com/watch?v=Bl3zHuih_CY
       
 (DIR) Post #Am2ASS4SQ4JHsfvDrk by skyguided@cathode.church
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       Here it is: Glue tier list, according to me. S -- Excellent and Underappreciated:Contact cement, specialty epoxies (catch-all), UV cure adhesive, plastic solvent adhesives, microballoon lightweight epoxy.A -- Straightforwardly Good:Hot glue, 5-minute epoxy, E6000, wood glue, paper glue.B -- Useful but Widely MisusedCyanoacrylate/superglue, RTV silicone, spray glue, gluestick.C -- Dubious Utility: JB Weld, superglue gel, rubber cement.D -- WorthlessEpoxy putty, foaming urethane.
       
 (DIR) Post #B5Fb9WD3ERopaALJ68 by skyguided@cathode.church
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       @fafo :blob_eyesdown: can you do indium tin oxide on glass?
       
 (DIR) Post #B6ExjfYQ14FWchXHQ8 by skyguided@cathode.church
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       Emails announcing privacy policy updates for services I have no recollection of getting involved with.