Inverters, How do they work ?
 

Inverters have taken a prominent role in the modern technological world due to the sudden rise of electric cars and renewable energy technologies. Inverters convert DC power to AC power. They are also used in Uninterruptible Power Supplies, Control of Electrical Machines and Active Power filtering. This video will explain how to get a pure sinusoidal electric power output from DC power input in a step by step logical manner.
https://www.youtube.com/watch?v=qVeERT4nyz8

Laser microphone for discreet eavesdropping
 

Laser microphone for discreet eavesdropping - Spectra M
Portable laser microphone with a range of 400m
Laser microphone for discreet eavesdropping - Spectra M was designed with law enforcement professionals in mind
Separate modules for transmitter and receiver
Easy microphone installation and adjustment
Built-in digital sound recorder https://www.detective-store.com/lase...tra-m-457.html

Listen Through Wall Device Audio Examples
 

Битва за Луну. Луноход против астронавтов
 

13 июля 1969 года президент США Ричард Никсон был разбужен телефонным звонком. По данным, предоставленным ему ЦРУ, русские запустили к Луне робот, который должен взять грунт и вернуться на Землю.

Никсон собирает экстренное совещание. Специалисты докладывают - ситуация критическая. Ровно через 3 дня Соединенные Штаты отправят первую в истории человечества экспедицию на Луну. Ракета уже стоит на стартовой площадке, но Москва отказывается сообщить траекторию полета своего аппарата. Это означает, что корабль "Аполлон-11" может столкнуться с ракетой русских.

Никсон отдает приказ: "Старт американского экипажа не отменять!" Этот полет должен был поставить точку в "космическом" споре, начавшемся 8 лет назад... https://www.youtube.com/watch?v=UtNMCySQvn4

Listen Through Walls Spy Device
 

Endoscope 5.5mm Borescope Camera Inspection For Android PC Laptop Waterproof LED
 

Listen Through CONCRETE WALLS & FLOORS With a diagram
 

The Audio Listening Circuit A15 below was based on a ton of research that I did into STC ( Sound Transmission Class ) and STL ( Sound Transmission Loss ) thru different building materials, doors, windows, concrete, stud walls and how those materials affected frequency loss, suppression and the normal DB levels within a home, an office, a retail store and the audio being intercepted on the backside of the materials above. http://www.bugplan.com/a15.htm https://www.youtube.com/watch?v=YfYlYJYIzXQ

Spy and Surveillance Circuits
 

How To Use Your Smartphone to See Through Walls!
 

The Action Lab
Published on Apr 16, 2018
Want to become a spy? In this video I show you how to use your smartphone to see through walls using RF 3D imaging technology. You can even combine some tech and get wall penetrating motion sensing! Checkout how to see-through walls an other materials even concrete. This is so cool. I might just use this setup to see through walls or doors or floors in the future of the need arises! https://www.youtube.com/watch?v=7-83Ou9QciA

How to Make a Night Vision Camera From a Regular Digital Camera (Infrared IR)
 

Rickvanman - Variety Channel
Published on Jan 28, 2017
How to convert a digital camera into an infrared night vision camera. I needed a camera that could film in the darkness of night whilst doing astronomy, so I converted this old snappy to be able to see infrared light. It works a treat! https://www.youtube.com/watch?v=qRCz6n_cqHM

Giant 13kJ RUBY LASER CANNON! Test Shots and Overview!!
 

styropyro
Published on Dec 14, 2017
The massive pulsed ruby laser is complete! In this video I'm feeding the flashlamp about 13kJ, which is a ton of electrical energy. In fact, this is probably the strongest ruby laser on YouTube. More destruction to come soon!

BIG thank you to Esco Optics for making me the mirrors for the laser. It turns out that finding mirrors that don't vaporize in a massive laser cavity like this is difficult, but coming up with the right coating was no problem for the Esco engineers.
escooptics.com https://www.youtube.com/watch?v=DwYuHqCwXFI

Ruby Laser Construction, DIY Electroplating
 

styropyro
Published on Sep 26, 2016
It's been a while since my last video, so I decided to give you an update on what's going on! Since my last vid I've moved from IL to NY and I have started grad school classes. I do like the program, but it has kept me very busy!

I finished the power supply for the ruby laser, and in this vid I fire up the lamp trigger. I'm a big fan of electrophoresis power supplies, because they provide a cheap and programmable source of high voltage DC! They can be had on eBay for as low as $50 (but DON"T buy one if you aren't experienced with electricity. One wrong move and you're dead on the floor.) What's left for me is to mount the lamp/ruby and then build the optical resonator.

The electroplating setup did not work as well as I'd have liked, but once I get some polishing tools I'll see if I can make it bright. https://www.youtube.com/watch?v=DYd0G_HZy_E

How to Make TEA Laser
 

RimstarOrg
Published on Oct 16, 2013
How to make a TEA laser, an easy to make laser, with step-by-step instructions. A TEA laser is an easy to make homemade/DIY nitrogen laser. TEA stands for Transverse Electrical discharge at atmospheric pressure meaning you use nitrogen in the surrounding air with no control over pressure. https://www.youtube.com/watch?v=v9sKqGC3t-0

Физик рассказал правду о беспроводной передаче энергии
 

QWERTY
Published on Oct 4, 2017
Российский радиофизик из МГУ Владислав Фагурел рассказал о том, что такое электричество будущего, какой в действительности может быть беспроводная передача энергии и почему фантастика относительно физики - реальна. https://www.youtube.com/watch?v=aC0mpUZz_RI

PHYSICISTS do not know what the ELECTRIC CURRENT
 

Крамола
Published on Nov 19, 2018 https://www.youtube.com/watch?v=kmvhCYeRPV4