Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum –...
-
Upload
dylan-harvey -
Category
Documents
-
view
221 -
download
1
Transcript of Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum –...
![Page 1: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/1.jpg)
Active Devices
Vacuum tubes
![Page 2: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/2.jpg)
Vacuum tubes
• Thomas Edison’s light bulb– Glass envelope – Vacuum– Filament
![Page 3: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/3.jpg)
FILAMENT
![Page 4: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/4.jpg)
Vacuum tubes
• Thermionic emission– Some metals will emit electrons when heated• “Thermionic” = heat• “Emission” = emit or shed
![Page 5: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/5.jpg)
Fleming Valve
• Ambrose Fleming– Added a cathode and plate to Edison’s bulb– Created a two element device– Diode = two elements– Called it the valve
![Page 6: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/6.jpg)
CATHODE
PLATE
FILAMENT
![Page 7: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/7.jpg)
![Page 8: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/8.jpg)
Vacuum tube diode
• When the charge on the plate is positive – current will flow
• When the charge is negative – no current flows
![Page 9: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/9.jpg)
- -- - - - --- -
_
![Page 10: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/10.jpg)
- -- - - - --- -
+
![Page 11: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/11.jpg)
Vacuum tube triode
• Lee Deforrest added a third element to the diode
• Triode = three elements
![Page 12: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/12.jpg)
CATHODE
PLATE
GRID
![Page 13: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/13.jpg)
Vacuum tube triode
• Third element called a grid• Triode amplifies• Deforrest called his triode the Audion
![Page 14: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/14.jpg)
Vacuum tube triode
• Small fluctuations in current on the grid are amplified or magnified on the plate
![Page 15: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/15.jpg)
+
10v
100vBias voltage
![Page 16: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/16.jpg)
+
--- - -
-- --- -
+ + + +
![Page 17: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/17.jpg)
+
--- - -
-- --- -
+ + + +
![Page 18: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/18.jpg)
10v
100vAudio in
Audio out
![Page 19: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/19.jpg)
![Page 20: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/20.jpg)
![Page 21: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/21.jpg)
![Page 22: Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.](https://reader031.fdocuments.net/reader031/viewer/2022020208/56649f225503460f94c3a24d/html5/thumbnails/22.jpg)