Identifying Electronic Component and Symbol

Identifying Electronic Component and Symbol is very important rule when fixing mobile phones problems..
Be familiar of its circuit symbols below for easy troubleshooting guide.
Every Electronics Component has its own symbols visualizing it;s function in every circuit diagram...
This is a very big help especially when working on hardware problems. This Components Symbol is a standard guides when reading or writing service schematic diagram  with various mobile phone products..
Electronic Components: Symbols & Functions  

 

Zener Diode

 

A special diode, which is used to maintain a fixed voltage in a power supply.Photodiode

 

A light-sensitive diode. Which react when light is shine direct on itmay increase or decrease it resistance

TransistorsComponent Circuit Symbol Function of Component

Transistor NPN A transistor amplifies current. It can be used with other components to make anamplifier or switching circuit.Transistor PNP A transistor amplifies current. It can be used with other components to make anamplifier or switching circuit.Phototransistor  A light-sensitive transistor.

Audio and Radio DevicesComponent Circuit Symbol Function of Component

Microphone A transducer, which converts sound to electrical energy.Earphone A transducer, which converts electrical energy to sound.Loudspeaker  A transducer, which converts electrical energy to sound.Piezo Transducer  A transducer, which converts electrical energy to sound.Amplifier (general symbol)

 

An amplifier circuit with one input. Really it is a block diagram symbol becauseit represents a circuit rather than just one component.

 

Aerial(Antenna) A device, which is designed to receive or transmit radio signals. It is alsoknown as an antenna.

Meters and OscilloscopeComponent Circuit Symbol Function of Component

Voltmeter 

 

A voltmeter is used to measure voltage.The proper name for voltage is 'potential difference', but most people prefer to say voltage!Amp-meter 

 

An amp-meter is used to measure current. As known as ampsGalvanometer A galvanometer is a very sensitive meter which is used to measure tinycurrents, usually 1mA or less.Ohmmeter 

 

An ohmmeter is used to measure resistance. Most Multimeter have anohmmeter setting.OscilloscopeAn oscilloscope is used to display the shape of electrical signals and it canbe used to measure their voltage and time period.

Sensors (input devices)Component Circuit Symbol Function of Component

LDRA transducer which converts brightness (light) to resistance (an electricalproperty).LDR = Light Dependent Resistor Thermistor 

 

A transducer which converts temperature (heat) to resistance (an electricalproperty).

Logic Gates

Logic gates process signals, which represent

true

(1, high, +Vs, on) or 

false

(0, low, 0V, off).There are two sets of symbols: traditional and IEC (International Electrotechnical Commission).

GateTypeTraditional SymbolIEC SymbolFunction of Gate

NOT

 

A NOT gate can only have one input. The 'o' on the output means'not'. The output of a NOT gate is the inverse (opposite) of itsinput, so the output is true when the input is false. A NOT gate isalso called an inverter.

 

AND

 

An AND gate can have two or more inputs. The output of an ANDgate is true when all its inputs are true.NAND

 

A NAND gate can have two or more inputs. The 'o' on the outputmeans 'not' showing that it is a Not AND gate. The output of aNAND gate is true unless all its inputs are true.OR

 

An OR gate can have two or more inputs. The output of an ORgate is true when at least one of its inputs is true.NOR

 

A NOR gate can have two or more inputs. The 'o' on the outputmeans 'not' showing that it is a Not OR gate. The output of a NORgate is true when none of its inputs are true.EX-OR

 

An EX-OR gate can only have two inputs. The output of an EX-ORgate is true when its inputs are different (one true, one false).EX-NOR

 

An EX-NOR gate can only have two inputs. The 'o' on the outputmeans 'not' showing that it is a Not EX-OR gate. The output of anEX-NOR gate is true when its inputs are the same (both true or both false).