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Module 2 Bipolar Junction Transistor

Module 2 Bipolar Junction Transistor. Learning Outcomes. The 3 terminals or regions of a BJT. Construction and symbol of NPN and PNP types Low power and high power packages 4. CE. CB. CC configuration The relation between the emitter, collector and base current Regions of operation

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Module 2 Bipolar Junction Transistor

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  1. Module 2 Bipolar Junction Transistor

  2. Learning Outcomes • The 3 terminals or regions of a BJT. • Construction and symbol of NPN and PNP types • Low power and high power packages 4. CE. CB. CC configuration • The relation between the emitter, collector and base current • Regions of operation • Transistor as a switch 8. The applications of a transistor.

  3. Regions of a Transistor

  4. A Bipolar Junction Transistor is a three terminal device containing 3 regions: Emitter , Base and Collector.

  5. THE TRANSISTOR There are two types of (bipolar junction) transistors, npn and pnp Bipolar transistor symbols

  6. NPN vs PNP • NPN and PNP function the same way • Power supply polarities are reversed • For NPN, positive supply is used • NPN has higher frequency response as electrons are the charge carriers. • NPN is more widely used

  7. A transistor consists of two PN junctions. Thus a transistor is like two PN – junction diodes connected back to back.

  8. 2.2Packages Examples of transistor packages

  9. Transistor Packages (low power & high power)

  10. 2.4 Transistor Configurations • common emitter (CE) • common base (CB) • common collector (CC).

  11. Currents in CE Circuit

  12. 2.5 Emitter, collector and base currents

  13. In the CE configuration:

  14. Transistor Operation Regions

  15. Transistor Applications: Transistor can act as a Switch

  16. Transistor Applications • Switch • Amplifier • Oscillator

  17. Transistor as a Switch • Light operated switch • Darkness operated switch • Digital Logic Gates • Switching power supply

  18. Transistor as a Variable Resistor • Amplifier • Oscillator • Modulator • Detector

  19. Light Failure Warning System using Transistor as a Switch

  20. Light Failure Warning System • In this, the transistor is used as a switch • LDR is a light dependant resistor. It is a light sensor. • When it is dark, LDR resistance increases; base current flows; the transistor becomes ON and relay switches. So the bell rings.

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