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Recent content by Sigurthr

  1. Sigurthr

    Tesla Coil Build Thread

    Odd about waveform. Make sure the scope has good RF grounding. Maybe there's actually harmonic content in it from low resonator Q, though this is unusual. Keep watching that plate glow, hehe. It doesn't really need to be a clean waveform, btw, vacuum doesn't care! Excellent results though!
  2. Sigurthr

    Tesla Coil Build Thread

    Oooh! Excellent, DWU! Yeah, VTTCs are highly tuned coils, so adding topload capacitance is tricky. Glad you didn't pop anything expensive, but they do tend to be fairly robust.
  3. Sigurthr

    Tesla Coil Build Thread

    30AWG is fine for up to a kW or so (at most common topload potentials) I've found. I like the 833A tubes, they're robust but expensive. Good choice. Yeah you can gut a MOT and make a new secondary from 10g wire for the filament trafo. Look to ebay for doorknob caps, it's pretty much the only...
  4. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Yep, Mattronium messaged me first. Yeah I'm surprised it didn't sell at 400 too, but oh well. The drastic laser market dropout in recent years is why I stopped flipping them. I used to make good cash restoring old HeNes and making controllers for argons. FWIW I bought this yellow for $550 +...
  5. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Re: For Sale: NOS Yellow 594.1nm 4.1mW HeNe -Price Dropped!- SOLD. Thanks a ton everyone! Sorry for the delay in thread update.
  6. Sigurthr

    Tesla Coil Build Thread

    Wow! Excellent results DWU! This is what I was hoping to hear from you all these months, hehe. Congratulations! Yup, as Twirly said, you've basically got wireless resonant power transfer going. It also works if one resonator is a harmonic of the other. Due to the low turns ratio on the primary...
  7. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Re: For Sale: NOS Yellow 594.1nm 4.1mW HeNe -Price Dropped!- Sorry, I can't go lower than 300. The shipping cost alone is significant. I already have an offer for 300, but of a suboptimal payment method (not PP), the person who made the offer knows it's on hold pending any other offers from...
  8. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Re: For Sale: NOS Yellow 594.1nm 4.1mW HeNe BUMP Price DROP!
  9. Sigurthr

    Tesla Coil Build Thread

    If you try shielding, keep it a few cm from any components or traces. If you can cut out strips or circles from any planar sections (like sheeting) it will help greatly to reduce eddy currents.
  10. Sigurthr

    Tesla Coil Build Thread

    Yep. But shielding is an absolute bitch to pull off correctly due to eddy currents (both heating and the power stealing effects). The "easiest" way is to place the USSTCC board inside of a plastic box just barely larger than needed, then place that box in a grounded metal box, and use >3mm...
  11. Sigurthr

    Tesla Coil Build Thread

    Absolutely beautiful build, Jeff! I'm very proud of you! Second video she sounds pretty happy in. First vid there's a bit of interruption on the feedback or interrupter input causing dropped cycles. It could be from impedance in the bus path or interference, etc. All in all though looks great!
  12. Sigurthr

    Tesla Coil Build Thread

    Very nice winding machine you've set up there! I never did make a permanent assembly, but anything beats winding 2000T by hand!
  13. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Re: For Sale: NOS Yellow 594.1nm 4.1mW HeNe Thanks for the specifics, UK! BUMP!
  14. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Re: For Sale: NOS Yellow 594.1nm 4.1mW HeNe Sorry dude! I don't have beam specs for it. I don't even have the apartment space to do a real divergence measurement anymore either. I might be able to get a crude beam width if you want though.
  15. Sigurthr

    For Sale: NOS Yellow 594.1nm 4.1mW HeNe -SOLD-

    Re: For Sale: NOS Yellow 594.1nm 4.1mW HeNe Thanks BowtieGuy! Yeah, it's a shame these don't liquidate like they used to, really. They're beautiful lasers. Dr. Sam does lifetime repairs on every unit like this he sells too I hear. Not that this would ever need a repair as long as it's cared...




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