Author Topic: Your pet peeve, technical or otherwise.  (Read 32754 times)

0 Members and 2 Guests are viewing this topic.

Online TimFox

  • Super Contributor
  • ***
  • Posts: 2034
  • Country: us
  • Retired, now restoring antique test equipment
Re: Your pet peeve, technical or otherwise.
« Reply #350 on: November 21, 2020, 09:30:10 pm »
How do you use a mercury arc rectifier to turn DC into AC? I didn't realize that was possible.

Either way it was not practical for small scale stuff. It would make no sense to use DC transmission into residential neighborhoods with converters to turn it into AC and step it down for each group of houses.

I said “Mercury-vapor tubes”.  The inverters used thyratrons or ignitions.  Mercury-vapor rectifiers do not use arcs.
I also see no reason to use DC instead of AC with transformers for local distribution.\

Edit:  as caught below, spell-check changed my "ignitrons" into "ignitions".  Microsoft's ignorance is bliss.
« Last Edit: November 22, 2020, 02:55:53 pm by TimFox »
 

Offline CatalinaWOW

  • Super Contributor
  • ***
  • Posts: 3874
  • Country: us
Re: Your pet peeve, technical or otherwise.
« Reply #351 on: November 21, 2020, 10:09:07 pm »
How do you use a mercury arc rectifier to turn DC into AC? I didn't realize that was possible.

Either way it was not practical for small scale stuff. It would make no sense to use DC transmission into residential neighborhoods with converters to turn it into AC and step it down for each group of houses.

It would make no sense to convert the existing installed base.   Starting from scratch with today's components it might make a lot of sense.  No capacitive or inductive loss.  No power factor issues.  Simplified grid sync. 
 

Offline Circlotron

  • Super Contributor
  • ***
  • Posts: 2188
  • Country: au
Re: Your pet peeve, technical or otherwise.
« Reply #352 on: November 22, 2020, 04:44:14 am »
The inverters used thyratrons or ignitions.
Ignitrons
Not being pedantic, just fixing the word so those unfamiliar with this olde timey tech can look it up.
 
The following users thanked this post: james_s

Online TimFox

  • Super Contributor
  • ***
  • Posts: 2034
  • Country: us
  • Retired, now restoring antique test equipment
Re: Your pet peeve, technical or otherwise.
« Reply #353 on: November 22, 2020, 02:54:34 pm »
Oops!  I typed "ignitron" but Microsoft didn't recognize the word.  I remember a comic strip where the office workers were not allowed to have games on their company computers, so they goofed off by entering their names into spell-check to see what came out.
 

Online Labrat101

  • Frequent Contributor
  • **
  • Posts: 358
  • Country: 00
  • TechLab ,,Time Traveling ,Plasma ,
Re: Your pet peeve, technical or otherwise.
« Reply #354 on: November 22, 2020, 04:21:15 pm »
Quote from: Circlotron on Today at 04:44:14 am>Quote from: TimFox on Yesterday at 09:30:10 pm
The inverters used thyratrons or ignitions.
Ignitrons
Not being pedantic, just fixing the word so those unfamiliar with this olde timey tech can look it up.


Ignitrons are ignitor-fired mercury pool rectifiers with very high peak and average current handling capability. Low frequency ignitrons were the backbone of the welder control and electroplating industries for years. These low-cost devices are still in use today in large motor speed controls and many welder panels around the world.
 Just A cool home garage project  >:D
« Last Edit: November 22, 2020, 04:28:04 pm by Labrat101 »
"   All Started With A BIG Bang!! .  .   & Magic Smoke  "
 

Offline themadhippy

  • Frequent Contributor
  • **
  • Posts: 447
  • Country: gb
Re: Your pet peeve, technical or otherwise.
« Reply #355 on: November 22, 2020, 05:05:36 pm »
Quote
office workers were not allowed to have games on their company computers
so instead  microsoft hid them as easter eggs within excel and word
 

Offline radar_macgyver

  • Frequent Contributor
  • **
  • Posts: 472
  • Country: us
Re: Your pet peeve, technical or otherwise.
« Reply #356 on: November 22, 2020, 05:41:07 pm »
It would make no sense to convert the existing installed base.   Starting from scratch with today's components it might make a lot of sense.  No capacitive or inductive loss.  No power factor issues.  Simplified grid sync.
It would require very expensive breakers that can deal with the arcs produced when interrupting a DC current. HVDC links (point-to-point) get around this by shutting off the rectifier, this won't work for a one-to-many distribution.
 

Online Labrat101

  • Frequent Contributor
  • **
  • Posts: 358
  • Country: 00
  • TechLab ,,Time Traveling ,Plasma ,
Re: Your pet peeve, technical or otherwise.
« Reply #357 on: November 22, 2020, 06:09:55 pm »
Quote from: radar_macgyver on Today at 05:41:07 pm>Quote from: CatalinaWOW on Yesterday at 10:09:07 pm
It would make no sense to convert the existing installed base.   Starting from scratch with today's components it might make a lot of sense.  No capacitive or inductive loss.  No power factor issues.  Simplified grid sync.
It would require very expensive breakers that can deal with the arcs produced when interrupting a DC current. HVDC links (point-to-point) get around this by shutting off the rectifier, this won't work for a one-to-many distribution.

These are still in production and shutting the arc off is simple . without a contactor .
 https://www.relltubes.com/products/High-Energy-Transfer-Products/Ignitron.html
 
"   All Started With A BIG Bang!! .  .   & Magic Smoke  "
 

Offline srb1954

  • Frequent Contributor
  • **
  • Posts: 259
  • Country: nz
  • Retired Electronics Design Engineer
Re: Your pet peeve, technical or otherwise.
« Reply #358 on: November 22, 2020, 08:42:46 pm »

I said “Mercury-vapor tubes”.  The inverters used thyratrons or ignitions.  Mercury-vapor rectifiers do not use arcs.

There are mercury arc rectifiers that certainly do seem to contain arcs when operating.

I have seen a demonstration mercury arc rectifier operating. It looked like a glass octopus with a large bulbous head about 800mm high in total. From each of the arms lightning bolts appeared to travel in a jagged arc to a spot on the surface of the mercury pool. The spot where the arcs terminated seemed to dance around randomly on the surface of the pool.

The whole assembly was enclosed in a explosion containment box made of a a thick, very dark tint plastic to filter out the prodigious UV emissions from the arcs.
 

Online TimFox

  • Super Contributor
  • ***
  • Posts: 2034
  • Country: us
  • Retired, now restoring antique test equipment
Re: Your pet peeve, technical or otherwise.
« Reply #359 on: November 22, 2020, 08:58:32 pm »
There is some confusion in nomenclature.
Mercury-arc rectifiers indeed have arcs into a pool of liquid mercury.
The mercury-vapor rectifiers to which I referred (e.g. 872 and 866) have hot cathodes emitting electrons, and the mercury ions inhibit space charge, allowing a much lower anode-cathode voltage when forward biased.  The 872A could withstand 10 kV reverse voltage, with only 10 V forward drop at several amperes forward conduction (much lower than a high-vacuum rectifier).
 

Offline mag_therm

  • Regular Contributor
  • *
  • Posts: 193
  • Country: us
Re: Your pet peeve, technical or otherwise.
« Reply #360 on: November 22, 2020, 09:23:12 pm »
Mercury Arc DC to AC inverters were in use probably before WW2.
They used 3 phase half wave (triple anode, 1 cathode, grid controlled)
glass bulb  mercury arc devices.

Probably used by rail-road and heavy industry eg steel rolling mill etc.

I have a reference here:
Robert Wells: "Static Power Converters" published 1962
 

Offline Circlotron

  • Super Contributor
  • ***
  • Posts: 2188
  • Country: au
Re: Your pet peeve, technical or otherwise.
« Reply #361 on: November 22, 2020, 10:03:56 pm »
Oops!  I typed "ignitron" but Microsoft didn't recognize the word.  I remember a comic strip where the office workers were not allowed to have games on their company computers, so they goofed off by entering their names into spell-check to see what came out.
That’s like MS Word 97. You would type in the name of former Australian prime minister Paul Keating and it would substitute the word “cheating”.  :-DD
 

Online TimFox

  • Super Contributor
  • ***
  • Posts: 2034
  • Country: us
  • Retired, now restoring antique test equipment
Re: Your pet peeve, technical or otherwise.
« Reply #362 on: November 22, 2020, 10:11:35 pm »
In a different arc discussion here, I referred to the “Poulsen arc” (later known as the “Federal arc”), and spell-check changed it to “Poulenc”.  When typing this, it did it again, but I was ready for it.  At least it was a high-class cultural error, instead of, say, “poultry”.
 

Offline NiHaoMike

  • Super Contributor
  • ***
  • Posts: 6859
  • Country: us
  • "Don't turn it on - Take it apart!"
    • Facebook Page
Re: Your pet peeve, technical or otherwise.
« Reply #363 on: November 22, 2020, 10:59:47 pm »
That’s like MS Word 97. You would type in the name of former Australian prime minister Paul Keating and it would substitute the word “cheating”.  :-DD
On some old version of OS X, entering "bill gates" into the terminal gives the response "kill gates?".
Cryptocurrency has taught me to love math and at the same time be baffled by it.

Cryptocurrency lesson 0: Altcoins and Bitcoin are not the same thing.
 

Offline Siwastaja

  • Super Contributor
  • ***
  • Posts: 3350
  • Country: fi
Re: Your pet peeve, technical or otherwise.
« Reply #364 on: November 29, 2020, 03:55:40 pm »
Saying "LDO" when you definitely mean "linear regulator".
 
The following users thanked this post: fcb, newbrain

Offline DimitriP

  • Super Contributor
  • ***
  • Posts: 1146
  • Country: us
  • "Best practices" are best not practiced.© Dimitri
Re: Your pet peeve, technical or otherwise.
« Reply #365 on: November 30, 2020, 08:03:31 pm »
Entering a conversation with:
"I'm a noob"
"I'm new to all this"
"All this is new to me"
"I just got this xyz and I know nothing"

and last but not least ....
"I'm a new ham"

Or "a ham radio license is "a license to learn" "

« Last Edit: November 30, 2020, 08:05:36 pm by DimitriP »
   If three 100  Ohm resistors are connected in parallel, and in series with a 200 Ohm resistor, how many resistors do you have? 
 

Offline SilverSolder

  • Super Contributor
  • ***
  • Posts: 3704
  • Country: 00
Re: Your pet peeve, technical or otherwise.
« Reply #366 on: November 30, 2020, 08:40:38 pm »
Entering a conversation with:
"I'm a noob"
"I'm new to all this"
"All this is new to me"
"I just got this xyz and I know nothing"

and last but not least ....
"I'm a new ham"

Or "a ham radio license is "a license to learn" "

I don't know, it seems kind of useful to state up front what your level of experience is?   

E.g. if someone starts the conversation "I have used oscilloscopes for years, but this measurement is driving me crazy..." you might respond differently than if someone says "I'm a complete n00b and this is my first 'scope, how would you...."

No?
 

Offline E-Design

  • Regular Contributor
  • *
  • Posts: 138
  • Country: us
  • Hardware Design Engineer
Re: Your pet peeve, technical or otherwise.
« Reply #367 on: November 30, 2020, 08:49:47 pm »
Entering a conversation with:
"I'm a noob"
"I'm new to all this"
"All this is new to me"
"I just got this xyz and I know nothing"

and last but not least ....
"I'm a new ham"

Or "a ham radio license is "a license to learn" "

I don't know, it seems kind of useful to state up front what your level of experience is?   

E.g. if someone starts the conversation "I have used oscilloscopes for years, but this measurement is driving me crazy..." you might respond differently than if someone says "I'm a complete n00b and this is my first 'scope, how would you...."

No?

Agreed.. level of experience can be useful in creating responses. So a free pass this time. But dont use the word n00b. Makes you sound like a b00b.

Speaking of scopes.. how about this GEM of a thread starter
"Help a woman choose here first oscilloscope" - like being a woman has ANYTHING to do with it. geez, geat real.
The best way to predict the future is to invent it.
 

Offline Ed.Kloonk

  • Super Contributor
  • ***
  • Posts: 1771
  • Country: au
Re: Your pet peeve, technical or otherwise.
« Reply #368 on: November 30, 2020, 09:11:09 pm »
They are better off making sandwiches.
 

Online james_s

  • Super Contributor
  • ***
  • Posts: 13401
  • Country: us
Re: Your pet peeve, technical or otherwise.
« Reply #369 on: November 30, 2020, 09:12:42 pm »
Entering a conversation with:
"I'm a noob"
"I'm new to all this"
"All this is new to me"
"I just got this xyz and I know nothing"

and last but not least ....
"I'm a new ham"

Or "a ham radio license is "a license to learn" "

I don't know, it seems kind of useful to state up front what your level of experience is?   

E.g. if someone starts the conversation "I have used oscilloscopes for years, but this measurement is driving me crazy..." you might respond differently than if someone says "I'm a complete n00b and this is my first 'scope, how would you...."

No?

I find it useful. It saves me from trying to explain Ohms law to an experienced EE, or making the assumption that someone already knows such basics and jumping straight to more complicated things.
 

Offline Bud

  • Super Contributor
  • ***
  • Posts: 4589
  • Country: ca
Re: Your pet peeve, technical or otherwise.
« Reply #370 on: November 30, 2020, 09:30:27 pm »
"I am designing thing X but I have no clue how to do it".

Really?

You are "designing" ?
Facebook-free life and Rigol-free shack.
 

Offline DimitriP

  • Super Contributor
  • ***
  • Posts: 1146
  • Country: us
  • "Best practices" are best not practiced.© Dimitri
Re: Your pet peeve, technical or otherwise.
« Reply #371 on: November 30, 2020, 09:33:51 pm »
"I am designing thing X but I have no clue how to do it".

Really?

You are "designing" ?

:-+

You forgot to add "noob" in the sentence :)   
   If three 100  Ohm resistors are connected in parallel, and in series with a 200 Ohm resistor, how many resistors do you have? 
 

Offline SilverSolder

  • Super Contributor
  • ***
  • Posts: 3704
  • Country: 00
Re: Your pet peeve, technical or otherwise.
« Reply #372 on: November 30, 2020, 11:02:03 pm »
Entering a conversation with:
"I'm a noob"
"I'm new to all this"
"All this is new to me"
"I just got this xyz and I know nothing"

and last but not least ....
"I'm a new ham"

Or "a ham radio license is "a license to learn" "

I don't know, it seems kind of useful to state up front what your level of experience is?   

E.g. if someone starts the conversation "I have used oscilloscopes for years, but this measurement is driving me crazy..." you might respond differently than if someone says "I'm a complete n00b and this is my first 'scope, how would you...."

No?

Agreed.. level of experience can be useful in creating responses. So a free pass this time. But dont use the word n00b. Makes you sound like a b00b.

Speaking of scopes.. how about this GEM of a thread starter
"Help a woman choose here first oscilloscope" - like being a woman has ANYTHING to do with it. geez, geat real.

Sure it has something to do with it...  like attracting hundreds of men to help her!  Probably the best framing of a question ever!   :D
 

Online Labrat101

  • Frequent Contributor
  • **
  • Posts: 358
  • Country: 00
  • TechLab ,,Time Traveling ,Plasma ,
Re: Your pet peeve, technical or otherwise.
« Reply #373 on: November 30, 2020, 11:48:13 pm »
Entering a conversation with:
"I'm a noob"
"I'm new to all this"
"All this is new to me"
"I just got this xyz and I know nothing"

and last but not least ....
"I'm a new ham"

Or "a ham radio license is "a license to learn" "

I don't know, it seems kind of useful to state up front what your level of experience is?   

E.g. if someone starts the conversation "I have used oscilloscopes for years, but this measurement is driving me crazy..." you might respond differently than if someone says "I'm a complete n00b and this is my first 'scope, how would you...."

No?

Agreed.. level of experience can be useful in creating responses. So a free pass this time. But dont use the word n00b. Makes you sound like a b00b.

Speaking of scopes.. how about this GEM of a thread starter
"Help a woman choose here first oscilloscope" - like being a woman has ANYTHING to do with it. geez, geat real.

Sure it has something to do with it...  like attracting hundreds of men to help her!  Probably the best framing of a question ever!   :D

That has really got to me that Post  :palm: 
    Its like putting the sweets near the checkout  .  ;D :P
"   All Started With A BIG Bang!! .  .   & Magic Smoke  "
 
The following users thanked this post: SilverSolder

Offline HobGoblyn

  • Supporter
  • ****
  • Posts: 352
  • Country: gb
Re: Your pet peeve, technical or otherwise.
« Reply #374 on: December 01, 2020, 09:14:43 am »
Nothing at all against charity and helping those in need,

BUT

I’ve had a bad week, we’ve also got the pandemic, I want to switch off from reality for a couple of hours, have a few beers and watch a comedy on the COMEDY channel and hopefully make myself laugh.

There was about 10 different charities advertising during that film, everything from children going blind to crippled donkeys. I’ve got all the sympathy in the world for their plight, but lately in the UK the charity tv adds are in overload. Imo I should be able to turn on the Comedy channel without seeing this sort of thing every 15 mins.

Hope no one misinterprets what I’m saying 
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf