electronics ppt
DESCRIPTION
presentation for basic electronics for robotics beginnersTRANSCRIPT
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Basic electronics
By:-Anirudha Kumar
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Name some electronic components???
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Circuit components used in robotics
Active
Voltage source Current source
Passive
Resistors
Capacitors
Inductors
Semiconductor
devices
Diodes
Transistor
s
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Coding Types of values written
• 47R• 5R6• 6k8• 1M2
Uses
Resistors
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Variable resistors
Used in two configurations• As variable resistor• As potentiometer
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Other types of resistors
PTC• Resistance increases with
temperature
NTC• Resistance decreases with
temperature
Equation of operation
Thermistors LDR•Light Dependent resistor•Made of CdS,CdSe,PbS•Uses
• On off light relay• As a light meter to
measure intensity of light
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◦ Types Ceramic Electrolytic
◦ Measuring◦ Uses
Capacitors
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Secondary cells• Can be reused by charging• Lead acid • Lithium ion • Lithium polymer
Cells
Primary cells can be use only once Zinc–carbon battery Alkaline battery
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Switches
• The number of poles defines the number of separate contacts for a switch position (inputs)
• The number of throws is the number of switch positions available(output)
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DPDT
• Construction of DPDT switches• Uses of DPDT switches
• For reversal of polarity• Single switch to control 3
different outputs
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Working of DPDT switches
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junction diode as a switch
At the junction, free electrons from the N-type material fill holes from the P-type material.
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1. Half wave rectifier2. Full wave rectifier a. Centre tapped b. Bridge type
Rectifiers
Input
Output
Half wave rectifier
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Full wave rectifier
Centre - tapped
Bridge type
Input
Input
Output
Output
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An LED is a semiconductor light source.
Uses ◦ General lighting◦ Displays◦ Traffic and street lights◦ Decorative purposes
Light emitting diode-LED
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A photodiode is a type of photo detector capable of converting light into either current or voltage,
A photodiode is designed to operate in reverse bias.
Used in solar cells
Photodiode
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Passive devices◦ Resistors◦ Capacitors
Active devices◦ Batteries
Semiconductor devices◦ Diodes◦ LED◦ Photodiode
Have a quick recap
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◦ Mechanically controlled electrically activated switch
◦ Uses To switch from low
current to high current
Relay
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Working of relay with a simple circuit
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H-bridge Used for reversal of direction of motor Working
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H-bridge using 4 relay
Clockwise movement Anti-Clockwise movement
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H bridge using 2 relays
Assignment
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Transfer resistor Types:-BJT, FET Uses
◦ Amplifiers◦ Switches◦ Regulators
Transistors
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Principle- Because a transistor's collector current is proportionally limited by its base current, it can be used as a sort of current-controlled switch.
Transistor as a switch
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A small switch may be used to control a relatively high-current load
Very quick and efficient
Advantages of transistor switch over normal switch
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H bridge using transistor
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A simple and less power consuming display
Two configurations ◦ Common anode ◦ Common cathode
For displaying numeric digits
Used in condition of small spaces
Seven segment display
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Write the terminals which will display the following digits?◦ 6◦ 9◦ 2◦ 5
Assignments
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Breadboard
Internal connections in a breadboard
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How to use is it? Measuring
resistance Measuring current Measuring voltage Checking
continuity Measuring the type
of transistor
Multimeter
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Thank you!!
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