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ScotchTapeLord

Wed Feb 09 2011, 12:03AM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635

Hello all,

I am working on getting a website together and I started a list of common terms that we throw around like everyday jargon that would have the common folk a'droolin, so that new and less experienced members can have a sort of guide to our technical slang.

It's in its early stage and needs your suggestions.

Adam Munich

Wed Feb 09 2011, 01:15AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

MOI = Fancy new microwave oven inverters.

Assload = 1.152kW

Hollow State = Containing nothing but vacuum tubes.

3l3ctrici7y

Wed Feb 09 2011, 09:47AM

Registered Member #1806 Joined: Sun Nov 09 2008, 04:58AM
Location: USA
Posts: 136

I thought assload was equal to 1.21 GW ;)
I think that since it was a single event, Joule would have been a better unit.

Proud Mary

Wed Feb 09 2011, 09:58AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

MOT- Microwave oven transformer, shunted, yet not current-limited step up transformers that put out about 2kV

MOT output is current-limited by means of magnetic shunts, though this limiting is not intended to withstand short circuits, as we find, for example only, in the older, non-electronic NSTs.

OBT- Oil burner transformer, they put out a few kV to ignite an oil-burner, and are not meant for continuous use

In Europe, at least, modern type-approved OBTs commonly have outputs from 2.5kV-0-2.5kV to 6kV-0-6kV with the centre tap taken to Earth. Some - but not all - OBTs are rated for continuous operation. Electronic OBTs are available with outputs of 2 x 12kV. While the great majority of OBTs have an earthed centre tap, single ended types are still available. Gas Burner Transformers resemble OBTs in most respects, but are usually single ended and typically have RMS outputs from 8kV - 10kV, with electronic types producing as much as 15kV.

LOPT/FBT- Flyback transformer, high frequency transformers that operate on pulsed DC, rated between 20kV and 30kV and 1mA on the output, can be AC or have internal rectifiers

Modern so-called 'Diode split' Line Output Transformers are commonly available in the range 18kV - 32kV. Older LOPTs intended for use with an external solid state doubler or tripler typically had AC outputs of 6kV - 10kV. Vintage AC output LOPTs - designed before HV solid state diodes were generally available - used a single thermionic diode as half-wave rectifier. As multiplication with thermionic diodes was not practicable because of the difficulty of providing floating filament supplies economically, these early LOPTs had to produce the full CRT anode voltage, and so can be expected to produce a considerably higher voltage than the later AC LOPTs designed to work into a doubler or tripler.

Iggy/Ignition Coil- these autotransformers come out of vehicles and are used to ignite the gasoline in a combustion engine

'Traditional' vehicular ignition coils have both a primary and a secondary winding, with the cold end of each taken to a common Earth. They are not autotransformers.

ScotchTapeLord

Wed Feb 09 2011, 01:35PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635

Thank you for your corrections and contributions.
I will make modifications to the main list.

Thank you for the specific numbers, Mary, I guess I should have written "about 20kV to 30kV" or stated that there is a +/-2kV tolerance on all my values, but I shall put in the new numbers and try to condense your details into something more noob friendly (their eyes get tired after two lines).

Just trying to keep things simple and basic, but that does not mean incorrect. Keep the information coming.

Proud Mary

Wed Feb 09 2011, 02:10PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

On reflection, I'd revise the voltage range of 'diode split' LOPTs in the downward direction to 17kV - and perhaps lower for miniature portable monochrome sets - and in the upward direction to 33kV for some large colour CRTs.

But you should consult an expert for a definitive view. I know only a little more about LOPTs than would a hippopotamus.

Steve Conner

Wed Feb 09 2011, 04:59PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Just to note: A forum thread is not a database. In 6 months time it'll be gone and forgotten. You all know how good the forum search function is.

But try typing any of the jargon terms mentioned into my custom 4hv search engine linked below, and you'll see there is already lots of info for each one.

This sort of thing should go in the HVWiki, if it isn't there already. Try searching it. I don't know if Chris has fixed the problem that caused registrations to be closed.

Oil burner ignition transformers are OBITs.

ScotchTapeLord

Wed Feb 09 2011, 05:44PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635

The thread was just wanted feedback and contributions. It would probably make a good addition to the wiki, but I was going to publish it on my site, first. As for the search function, of course there is a lot of information available, but I thought it would be good to have a centralized location with general information for quick reference that people can add to. A dictionary of sorts.

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob