Tài liệu BIASING ppt

Diodes,Transistors,Fets Practical Perspective... DIODES TRANSISTORS FETS HOW practical perspective „ Specs of diodes, „ Determine ckt, apparatus for forward bias.. „ Reverse bias ckt and

Diodes,Transistors,Fets Practical Perspective

Prof K Appa rao

DIODES TRANSISTORS FETS

HOW practical perspective

„ Specs of diodes,

„ Determine ckt, apparatus for forward bias

„ Reverse bias ckt and apparatus

„ FUN WITH DIODES

„ ZENER DIODES, design supply,estimate

ripple

„ TRANSISTORS Biasing methods

„ FETS How to bias difficulties

„ FETS How to bias, difficulties

„ Apparatus: DC Power supply

„ Ammeter , Voltmeter, Diode,

„ Resistor ,Bread board, Wires

„ Apparatus: DC Power supply

„ Ammeter , Voltmeter, Diode,

„ Resistor ,Bread board, Wires

An Engineer specifies thus

„ Dual/Single Dc Regulated Power supply 0-30v /

1 A ……… 1 No.

„ Moving coil DC milli ammeter 10 ma FSD… 1

No.

„ 3 ½ digit Digital Multi-meter LCD type 1No.

„ Diode type 1N 4148…… 1 No.

„ Carbon Film resistor 2.7 k ½ w 5 % …1 No

„ Bread board….1 No

„ Single strand 1/20 insulated PVC wires

„ Single strand 1/20 insulated PVC wires…

Reverse Bias Characteristic….

„ A widely used circuit, Is it OK ?

„ I r= Vosc/1 M, say 15 mv/1M =15 nA !!

„ I r= Vdmm/1 M, say 15 mv/1M =15 nA !!

FUN WITH DIODES

EnjoyQUIZ

PROBLEM 1.

1 k

I

Si Ge

10 V

I

„ I (a) 10 ma (b) 9 7 ma ( c ) 9 3 ma

„ I = (a) 10 ma (b) 9.7 ma ( c ) 9.3 ma

PROBLEM No 2

1 k

I

Si Ge

10 V

I

I= (a) 9.3 ma (b) 0 ma ( C ) 9.7ma

PROBLEM No 4

1 K

Vo

5 V + 10 V

„ Vo = (a) 0.7 v (b) – 5 v ( c ) - 4.3 V

- 5 V

FUN WITH LEDS &

FUN WITH LEDS & RECTIFIERS

EnjoyQUIZ

Use LEDs ,Glow on conduction

Some interesting Applications

USING DIODES

Radio without power

Antenna

D1

Ear phone

Lamp life protector

Current direction indicators

Clip wave around zero

ZENER DIODES

Analysis, Design

Design of Zener diode supplies

FUN WITH ZENERS

EnjoyQUIZ

( c ) 0v

Ie Ib

Biasing (Beta dependant)

Fixed Bias with Emitter stabilised

Feed back Bias with Emitter stabilised

Voltage Divider Bias

R1

Vcc Vb = (Vccx R2)/(R1 + R2) T1

Rc R1

FUN WITH TRANSISORS

Enjoy QUIZ

OK

PROBLEM No 2

1k 100k

Vc1= ? T1

Vc2 = ?