Active Devices Vacuum tubes. Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament.

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Presentation transcript:

Active Devices Vacuum tubes

Thomas Edison’s light bulb – Glass envelope – Vacuum – Filament

FILAMENT

Vacuum tubes Thermionic emission – Some metals will emit electrons when heated “Thermionic” = heat “Emission” = emit or shed

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

CATHODE PLATE FILAMENT

Vacuum tube diode When the charge on the plate is positive – current will flow When the charge is negative – no current flows

_

Vacuum tube triode Lee Deforrest added a third element to the diode Triode = three elements

CATHODE PLATE GRID

Vacuum tube triode Third element called a grid Triode amplifies Deforrest called his triode the Audion

Vacuum tube triode Small fluctuations in current on the grid are amplified or magnified on the plate

+ 10v 100v Bias voltage

10v 100 v Audio in Audio out