Fusor Forums

There are two safety reasons why the grounding pin of every receptacle needs an intentional metallic path to the transformer secondary winding, and a locally driven earth ground rod or water pipe connection is insufficient. In NEC land, for new work; details depend on authority having jurisdiction. ...

Very good. Do they put it up in 90 ml bottles, or in standard 100 ml bottles with more ullage? How careful are you all about handling D2O as a hygroscopic substance? I would guess that if the bottle sat for 10 minutes with cap off, the amount of normal H2O picked up is unlikely to exceed the amount ...

Saw something the other day, reminiscent of vintage electronics restorations where ancient capacitors have been eviscerated & stuffed with modern ones. On the grounds of a local history museum, next to the water tank house and windmill, is a well pump with 1.5 HP electric motor. 20201004_173222.jpg ...

Hey Keelan, You asked whether your bell jar can withstand vacuum of 30 microns inside. By what factor is the stress greater than that on same jar with vacuum of 30 torrs inside? Assume the external pressure is 760 torrs in both cases. Not counting the risk of spot heating by electrified particle bea...

Natural gas prices are at historic lows because of fracking, and misguided federal approach to "energy independent USA". That means we are depleting our fixed reserves faster than ever. Short sighted, kind of like cutting taxes so USA is borrowing money from China faster than ever. My city council i...

Nice work there; thanks for demonstrating by doing. It's OK to talk about using parts above their ratings. This is no worse than using MWO diodes to rectify a NST output, when operating PRV can be more than 21 kV. Electrical component abuse is a popular theme on Tesla coil forums. All are cases wher...

So Venus atmosphere balloon probe joins the throng of applicants competing for space probe funding. Other missions include the big metallic asteroid, Titan lake floater, Enceladus and Europa, etc. One that got approved, as discussed here a year or so ago, is the Titan lander / quadcopter that can fl...

Kuri is the same brand as my spiral hose. John's a practiced expert with vacuum stuff, and I'm lately just a pretender. Have never set up any diffusion or turbo pump with a backing pump. Need to clear a path to a work space for vacuum gear, not touched (except for opportunistic acquisitions) in abou...

Very cool, Ed. Back to vacuum gear and foreline connections, I finally dug out the vacuum hoses here. The ID of spiral-reinforced hose is 1/2 inch, and of thick rubber hose is a little less than 3/8 inch. Too small for the need you mentioned, but they are free to anyone who wants to pay the postage....

You need to start by specifying details like the RF impedance of the HV load, HV power source, and RF signal source. The series capacitor on RF-input branch obviously needs to hold off some kV, and will conduct glitches from HV arcs and sparks back to the RF signal source. The traditional inductor o...