Re:The Magnetic Amplifier – A Lost Technology of the 1950s
by moron4hire on Thursday June 18, 2020 @10:20AM
(#23563344)
You can use a flame as a triode to build an amp
https://www.youtube.com/watch?v=-aAwyUoawkc
Tangentially, you can use a flame to emit sound directly http://onetuberadio.com/2018/07/02/flame-speaker-science-fai...
Re:The Magnetic Amplifier – A Lost Technology of the 1950s
by raverbashing on Thursday June 18, 2020 @04:06AM
(#23560874)
Amazing, and a bit quaint.
Of course, there's a reason why most of these aren't used anymore and even valves are used in very specific applications (or let's say, not all of them exactly for pure engineering reasons)
Semiconductors blow all of these out of the water. And as technology for higher power/higher frequency gets better they will be replaced more and more by semiconductors.
Old welding transformers are controlled by a magnetic shunt- field lines are directed through a movable shunt instead of the secondary.
https://www.youtube.com/watch?v=k5684mQJQRU
There are magnetic core logic circuits, see:
https://www.youtube.com/watch?v=p7SkE5pERtA
You can make very loud record players using compressed air:
http://www.douglas-self.com/MUSEUM/COMMS/auxetophone/auxetop...
You can make audio amplifiers using friction:
http://www.douglas-self.com/MUSEUM/COMMS/trumechamp/trumecha...
Friction can be electrically controlled:
https://www.gettyimages.com/detail/news-photo/this-wall-tele...
You know that magnetic tape hiss? That makes a great radio detector:
https://www.youtube.com/watch?v=4CAxWoKD-fw