Robotics AcademyElectronics

Introduction to electronics

• Resistors• Capacitors• Semiconductors (Diodes, LED,

Transistors, IC’s )• LDR• Photo(cell, transistor, diode)• Regulators• Measuring instrument (AVO)

Resistors

• A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor.

• How to know value of resistor ?!• From the known table of colours.

Variable resistors (pot)

Capacitors

• A capacitor is an electronic component that stores energy in the form of an electrostatic field.

Used for:• Smoothing and filtering• Storing energy

Symbols

• Unpolarized

• polarized

• variable

Semiconductors

•Diodes

Transistors

• Use as amplifier and switch.

Some forms of it

Integrated circuits (IC’s)

LED’S

LDR• LDRs or Light Dependent Resistors are very useful especially

in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are illuminated with light resistance drops dramatically.

Solar cell

Phototransistor & IR

Photodiode & IR

Schematic of them

IR Receiver & IR

Regulators

• A dc power supply is an essential component in any electronic system .

• Constant voltage regulator 780x , 790x.

• Variable voltage regulator (lm317,lm117,lm318,lm150,lm138).

Schematics

• For constant voltage regulators:

Examples of variable regulators (lm317,lm117)

MultiMeter (AVO)

Thank you

Introduced by

• Eng. Mustafa Ahmed Hemdan.• Chairman of Robotics &Automation Chapter• Communications & Electronics department.• E-mail: hemdan@ieee.org

• Our blog : • http://rastsc.wordpress.com• Our group on facebook :• Robotics & Automation Chapter