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INSTITUTO POL ITCNICO NACIONAL

ESCUELA SUPERIOR DE CMPUTO

ELECTRNICA ANALGICA

Practica No. 5

PUNTO DE OPERACIN DE BJT

Equipo:

Profesor:

Grupo:

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INDEX

Objetive ------------------------------------------------------------------- 3

Materials ------------------------------------------------------------------ 3

Theoretical Introduction: ---------------------------------------------- 3

Experimental Development ------------------------------------------ 4

Circuit Simulation ------------------------------------------------------ 6

Questionnaire ----------------------------------------------------------- 7

Conclusion --------------------------------------------------------------- 7

Sources ------------------------------------------------------------------- 7

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OBJETIVE

- Identify the terminals of a transistor with a multimeter.

- Analyze the main configurations of polarization of the BJT.

- Fix witch is the most stable configuration (taking care about temperature).

-Analyze the importance of the (beta) in the bias circuit.

- Interpret the results of the circuits used.

MATERIAL1 Breadboard1 Box of matches2 Transistors 2N22222 Transistors BC547C2 Transistors BC557C4 resistors (560 )3 resistors (470 k)3 resistors (220 )2 resistors (1.2 k)2 resistors (4.7 k)

TEAMA variable voltage source C.D.1 digital multimeter

THEORETICAL INTRODUCTION:

For the practice we need some various materials which are:

Protoboard.- Also known as breadboard, is a reusable plate used to build prototypes ofelectronic circuits with or without solder. Normally used for experimental testing.

Resistance.- An electronic component designed to introduce a specific electricalresistance between two points in a circuit.

Transistor.- The transistor is a semiconductor electronic device which acts as amplifier,oscillator, switch, or rectifier. The term "transistor" is a contraction in English resistortransfer ("transfer resistance").

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I. - EXPERIMENTAL DEVELOPMENT:

Beta value of the transistorMeasured by the meter in the choice of transistors (pnp npn hfe) the beta of eachtransistor.

2N2222 BC547C BC557C 75< 110