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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.
Capacitors
• A capacitor is an electronic component that stores energy in the form of an electrostatic field.
Used for:• Smoothing and filtering• Storing energy
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.
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).
Introduced by
• Eng. Mustafa Ahmed Hemdan.• Chairman of Robotics &Automation Chapter• Communications & Electronics department.• E-mail: [email protected]
• Our blog : • http://rastsc.wordpress.com• Our group on facebook :• Robotics & Automation Chapter