Electronic symbols _Ký hiệu điện tử

Fixed-value resistor Variable resistor Voltage-sensitive resistor varistor Resistors Sources Constant-voltage source Constant-current source + − AC oscillator source Batteries Sing

Fixed-value

resistor

Variable

resistor

Voltage-sensitive

resistor

(varistor)

Resistors Sources

Constant-voltage source

Constant-current source

+

−

AC oscillator source

Batteries

Single-cell battery

+ −

Multiple-cell battery

− +

Circuit protectors

Fus e

Circuit breaker

Capacitors

Fixed-value capacitor

Electrolytic capacitor

Variable capacitor

Ground

Crystals Piezoelectric crystal

Earth ground

Chassis or frame connection

Isolated

Incandescent

lamp

Signal lamp

Flashing signal lamp

Neon lamp, DC

type

Neon lamp, AC

type

Fluorescent

lamp

Two-terminal

Inductors

Fixed-value inductors

Fixed-value inductors With magnetic core

variable inductors

Audio devices

Loudspeak er

Microphone

Amplifiers

Single-ended amplifier

Differential amplifier (or comparator)

Norton (current) amplifier

− +

Waveguide

Circular waveguide

Rectangular waveguide

Flexible waveguide

Twisted waveguide

Transformers

Transformer (air core)

Transformer (iron core)

Transformer (ferrite core)

Shielded transformer

+

−

Two-conductor

cable with

grounded shield

Coaxial cable

with grounded

shield

Twisted

pair

Stripline

Unbalanced

stripline

Unbalanced

stripline

Contacts

Fixed relay contact

Fixed switch contact

Moving contact, locking

Moving contact, nonlocking

Closed contact

Open contact

Make-before-break contact assembly

Break-before-make contact assembly

Monostable multivibrat or

Monostable(single-shot,one-shot)

1

Phase shifters

Matched phase shifter

φ

Schmitt trigger

General

Switche s

Single-pole single-throw (spst)

Single-pole double-throw (spdt)

Double-pole double-throw (dpdt)

Push-button switch, normally open

Push-button switch, normally closed

Multiposition switch

P

SS

From A, spst

normally open

(make)

From B, spst

normally closed

(make)

From C, spst

(break,

make)

From D, spst

(break,

make)

Filters

Mode

filter

Bandpass filter

Low-pass filter

High-pass filter

Band-reject filter

Microwav

e circuits

Waveguide hybrid junction

Stripline hybrid junction

Coupling by loop to space

Coupling by loop to guided transmission path

Coupling by loop from coaxial to circular waveguide, with DC grounds connected

Dual directional coupler

Fixed-direction circulator

Reversible-direction circulator

Mode suppressor for both coaxial and waveguide

transmission

H E

4

λ

4

λ λ 4 λ 4

3 λ 4

Rectifier (junction)

diode

Zener

(undirectional

breakdown)

diode

Bidirectional

breakdown

diode

Constant-current

(field-effect) diode

Tunnel diode

Tunnelrectifier (backward) diode

Schottky (hot-carrier) diode

P-i-n diode

Gunn diode, also impatt diode

Step-recovery(snap, charge-storage) diode

Varactor (variable-capacitance) diode

Transistors

NPN transistor

Multiple-emitter npn transistor

PNP transistor

E E E E C

B

npn Darlington transistor

C E B

C E B

C E B

C E B

C

E B

npn Schottky transistor C

E

B

Unijunction transistor (UJT) with n-type base

B2 E

B1

E B2

B1

Unijunction

transistor (UJT)

with p-type base

Programable unijunction

transistor (PUT), also SCR

with n-type base

Thyristors

Four-layer (pnpn, Shockley)

diode

A

K

Silicon-controlled rectifier(SCR)

Silicon-controlled switch(SCS)

Diac(bidirectional switch)

Triac(grated bidirectional switch)

G

Field-effect Transistors(FETs )

N-channel Junction-gate P- channel (JFET)

D S

S G

D S G

Three-terminal depletion-type insulated-gate (IGFET)

D S G

D S G

D S G

Three-terminal depletion-type IGFET, substrate tied to source

S G

D S

G

D

Four-terminal depletion-type IGFET

S G

D B

S G

D B

Four-terminal enhancement-type IGFET

G

G

G 1

G 2

S G

D B

S G

D B

Five-terminal

dual-gate depletion-type

IGFET

S G1

D B G2

S G1

D B G2

Five-terminal

dual-gate

enhancement-type IGFET

Optoelectronic

diodes

Light-emitting

diode(LED)

Photodiode

Npn bidirectional photodiode(photo-duo-diode)

Pnp bidirectional photodiode(photo-duo-diode)

Pnp two-segment photodiode, with common cathode

Pnp four-quadrant photodiode, with common cathode

A

A

A A K

Phototransistor s

Npn phototransistor,

no base connection C

E

Npn phototransistor, with base connection

C E B

Optically coupled isolators

With photodiode output

With phototransistor output, no base

connection

With phototransistor output, and base connection

B S G1

D

S

G2

With

photo-Darlington output,

no base

With

photo-Darlington output,

and base

With

photo-Darlington output,

and base

With

NAND-gate-photo detector

output

Gate

Dual-input multiple-inputAND

gate

NAND gate, negated output

NAND gate, negated input

OR gate

1

≥

NOR gate, negated output

NOR gate, negated input

Exclusive-OR gate

1

=

Inverter

FLIP-FLOPS

R-S (set-reset) flip-flop

Toggle-flip-flop

J-K flip-flop

D-type flip-flop

Voltage amplifier

Transcomductan

ce amplifier

Transresistance amplifier

VCV S

Current amplifier

+

− Kvi

CCC S

KI i

+

−Ag

+

− Ar

+

− Ai

KV IN

& &

&

&

& &

1

≥

1

≥

1

≥

1

R

S FF

R

SFF

Q Q

K J

R

SFF

Q Q

C FFQ Q

J

K

D

CFF

D

CLFF Q Q