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Q&A Is it possible for one transistor to switch between two loads?

The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this transistor switch can control o...

3 answers  ·  posted 4y ago by Circuit fantasist‭  ·  last activity 4y ago by Circuit fantasist‭

#4: Post edited by user avatar Circuit fantasist‭ · 2020-12-14T13:13:49Z (almost 4 years ago)
Clarifying
  • The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this _transistor switch_ can control only a single collector load.
  • Is it possible to make the transistor act as a 3-terminal SPDT switch? If so, one transistor will be able to control two loads.
  • In general, can a SPST switch act as a SPDT switch?
  • The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this _transistor switch_ can control only a single collector load.
  • Is it possible to make the transistor act as a 3-terminal SPDT switch? If so, one transistor will be able to control (switch between) two loads.
  • In general, can a SPST switch act as a SPDT switch?
#3: Post edited by user avatar Circuit fantasist‭ · 2020-10-16T19:21:50Z (about 4 years ago)
Making the question more clear
  • Is it possible for one transistor to switch two loads?
  • Is it possible for one transistor to switch between two loads?
#2: Post edited by user avatar Circuit fantasist‭ · 2020-10-16T09:34:21Z (about 4 years ago)
Generalizing the question
  • The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this _transistor switch_ can control only a single collector load.
  • Is it possible to make the transistor act as a 3-terminal SPDT switch? If so, one transistor will be able to control two loads.
  • The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this _transistor switch_ can control only a single collector load.
  • Is it possible to make the transistor act as a 3-terminal SPDT switch? If so, one transistor will be able to control two loads.
  • In general, can a SPST switch act as a SPDT switch?
#1: Initial revision by user avatar Circuit fantasist‭ · 2020-10-16T09:21:23Z (about 4 years ago)
Is it possible for one transistor to switch two loads?
The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this _transistor switch_ can control only a single collector load.

Is it possible to make the transistor act as a 3-terminal SPDT switch? If so, one transistor will be able to control two loads.