Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [vacuum]

24 questions
8
votes
2 answers

Why is a pentode tube more power efficient than a triode tube?

As title. I read some article and it says something like this: Tetrode was invented to reduce grid-plate capacitance. Pentode was invented to reduce secondary emission. I also heard that a pentode has greater power efficiency than a triode. I…
Moses
  • 93
  • 5
8
votes
3 answers

Does a pickup microphone work in space (vacuum)?

Of course in space there is no sound transmitted via air, so there is no air-borne sound, but there is structure borne sound. This sound can be recorded with a pickup microphone, but do pickup microphones need air to work as well? Considering that a…
Karsten Becker
  • 333
  • 1
  • 3
  • 7
6
votes
2 answers

UHF Tesla coil powered by low voltage?

I want to know if it is possible to use a 2.4 GHz magnetron as a oscillator for a Tesla coil circuit. The idea is to use a oscillating relay-driven step up transformer (12 V to 10 kV) and then charge a capacitor bank up, just to smooth the DC…
South African Railfan
  • 63
  • 6
5
votes
3 answers

3 hp vacuum cleaner, but 1200 W rating

How can a vacuum cleaner say it's 3 hp, yet only be rated at 1200 W since 1 hp is ~750 W? The product description says it has a "3 horsepower motor" and that 3 hp is the peak.
g491
  • 181
  • 1
  • 5
3
votes
3 answers

How to make an anti-static vacuum cleaner?

I heard that vacuum cleaners are dangerous to use near electronic components because they build up static, and apparently, even modern components are so extremely vulnerable to static that merely sucking a bit of dust off them with a vacuum cleaner…
Juan Perez
  • 153
  • 8
2
votes
1 answer

In a vacuum triode (positive terminal to anode, negative terminal to cathode), how do the electrons flow from the control grid to the anode?

In a vacuum triode (positive terminal to anode, negative terminal to cathode,) once we apply the positive charge to the control grid it will start to attract free electrons, which are released from cathode due to thermo-ionic emission. How do the…
SATHISH RAMASWAMY
  • 21
  • 1
2
votes
4 answers

How to regulate temperature of an IC/PCB -in a vacuum

I have to regulate the temp of an IC. (70deg. C) The part will be in a vacuum chamber. Electrical connections can pass in-out of the vacuum chamber through a port (plenty of connections available.) I have done this before in air using TECs to…
Tony
  • 683
  • 4
  • 14
2
votes
4 answers

Lighting up old vacuum tubes and making them turn on/off

I know there were older posts about lighting up old vacuum tubes but I would also like to turn them on and off. I am a complete newbie with no real electronic experience here so please bear with me. I bought an old cabinet full of brand new but…
Lizabeth D
  • 21
  • 1
2
votes
2 answers

LED light bulbs in low atmospheric pressure

I have these (https://www.amazon.co.uk/gp/product/B01DBOKZVK/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1) LED lightbulbs. Can I use them in a pressure of ~30kPa (21" Hg vacuum)?
Peter Poláček
  • 39
  • 4
2
votes
2 answers

Reliability of electronic components in space

The Tesla car being recently shot into space made me wonder about the reliability of common electronic components in hard vacuum. I'm asking about the kind of components you would find in Musks's car-turned-stellar object, not specific components…
bobflux
  • 70,433
  • 3
  • 83
  • 203
1
vote
1 answer

Reverse engineering my robot vacuum

I am reverse engineering my Dirt Devil M612 Spider 2.0 vacuum cleaner as a hobby project, such that later on, I can use a micro-controller to run it myself. I was looking into how the motors were driven and I found a H-Bridge setup which I created a…
Mart
  • 312
  • 1
  • 13
1
vote
0 answers

Igniting and maintaining plasma in low pressure chamber

I'm trying to create and maintain plasma inside a vacuum chamber (up to 50 Pa), I have a home-made feedthrough done with an HV BNC sealed with Viton gaskets on a KF50 flange (makes a ≈25 mm gap). I have a 1-10 kV supply with 5 mA and one low voltage…
lasb3tas
  • 185
  • 8
1
vote
1 answer

Power transformer question in vacuum tube circuit

I am having trouble wrapping my brain around this power transformer circuit. I must be missing something very fundamental, so I apologize in advance for that. Can someone explain to me why the center tap on this schematic does not have to be…
McMurdo
  • 117
  • 7
1
vote
3 answers

How to power long (30 ft) nichrome wire from 120v AC wall socket

I am working on making a vacuum forming machine, and I need to power a significant length of nichrome wire off of a 120v AC wall socket. I have very little experience in electronics, but I have talked to a few people who are experienced in…
Caleb Wright
  • 13
  • 3
0
votes
2 answers

Going beyond temperature rating for surface mounted resistor? Will it damage it?

I am putting surface mounted resistors inside a vacuum chamber and then baking the vacuum chamber at 200°C for 2 weeks, no voltage will be applied to the resistors during this time. Will this damage the resistors if they are rated up to 155°C?
fgsiv
  • 3
  • 1
1
2