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Basic Electronics(26811)

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Responsible Gulshan Ara Akhi
Last Update 03/18/2024
Completion Time 2 days 23 hours 31 minutes
Members 1
Daffodil Polytechnic institute Diploma Gulshan Ara Akhi
  • Course Overview
    • Course Overview_ devices have become an important part of our day-by-day
  • Mark Distribution
    • Mark Distribution
  • Suggestion Of basic electronics
    • https://docs.google.com/document/d/1PrDsWYwWh4ntyvdmimWqls56SUR5Kt3P/edit
    • Basic Electronics final suggetions ২০২৩
  • Lesson Plan
    • Basic Electronics
  • Define resistor, inductor and capacitor and mention the function of those in electronic circuits.
    • Lecture 1.pptx
  • কালার কোড এর সাহায্যে মান নির্ণয়
    • রেজিস্টর এর কথকতা
  • Resistor Color Code Calculation in Hindi - 4 Band Resistor
    • Resistor Color Code in HINDI | 4 Band Resistor Calculate and Explained
  • Semiconductor
    • Semiconductor
  • P -type N-type Semiconductor
    • Semiconductor: What is Intrinsic and Extrinsic Semiconductor ? P-Type and n-Type Semiconductor
  • Recorded Live Class
    • Energy band diagram(Conductors, Insulators, Semiconductors)
  • Semiconductor Diode
    • একটি p-টাইপ ও একটি n-টাইপ অর্ধপরিবাহীকে বিশেষ ব্যবস্থাধীনে সংযুক্ত করলে সংযোগ পৃষ্ঠকে p-n জাংশন বলে। একটি বিশুদ্ধ অর্ধপরিবাহী কেলাসের এক অর্ধাংশ p-টাইপ অর্ধপরিবাহী এবং অপর অর্ধাংশকে n-টাইপ অর্ধপরিবাহী উচ্চতাপে সুনিয়ন্ত্রিত পদ্ধতিতে মিশিয়ে p-n জাংশন তৈরি করা হয়। p-n সংযোগের দুই পাশে যে সরু তর ধনাত্মক ও ঋণাত্মক আধানকে পৃথক করে রাখে, যেখানে গতিশীল আধান নিঃশেষ হয়ে যায় এবং কোনো গতিশীল আধান বাহকের অস্তিত্ব থাকে না, ওই স্তর বা অঞ্চলকে বলা হয় নিঃশেষিত স্তর বা অঞ্চল (Depletion layer or region)।
  • Recorded Live Class
    • 🔴 p-n Junction | Forward and Reverse Bias | video in HINDI
  • PN junction diode V-I Curve Diagram
    • VI characteristics curve of diode
  • Recorded Live Class
    • V-I Characteristics of PN Junction Diode
  • Special Diode
    • aractor Diode A junction diode has two potentials on both sides where the depletion region can act as a dielectric. Hence there exists a capacitance. The Varactor diode is a special case diode that is operated in reverse bias, where the junction capacitance is varied. The Varactor diode is also called as Vari Cap or Volt Cap. The following figure shows a Varactor diode connected in reverse bias. Varactor Diode If the reverse voltage applied is increased, the width of the dielectric region increases, which reduces the junction capacitance. When the reverse voltage decreases, the width of the dielectric decreases, which increases the capacitance. If this reverse voltage is completely null, then the capacitance will be at its maximum. Capacitance Voltage The following figure shows various symbols used for Varactor diode which represents its function. Varactor Diode Symbol Though all diodes have this junction capacitance, the Varactor diode is mainly manufactured to make use of this effect and increase the variations in this junction capacitance. Practical Varactor Diode Applications of Varactor diode This diode has many applications such as − It is used as a Voltage variable capacitor. It is used in variable LC tank circuit. Used as Automatic frequency control. Used as Frequency Modulator. Used as RF Phase shifter. Used as frequency multiplier in local oscillator circuits. Tunnel diode If the impurity concentration of a normal PN junction is highly increased, this Tunnel diode is formed. It is also known as Esaki diode, after its inventor. When the impurity concentration in a diode increases, the width of depletion region decreases, extending some extra force to the charge carriers to cross the junction. When this concentration is further increased, due to less width of the depletion region and the increased energy of the charge carriers, they penetrate through the potential barrier, instead of climbing over it. This penetration can be understood as Tunneling and hence the name, Tunnel diode. Tunnel Diode The Tunnel diodes are low power devices and should be handled with care as they easily get affected by heat and static electricity. The Tunnel diode has specific V-I characteristics which explain their working. Let us have a look at the graph below. VI Tunnel Diode Consider the diode is in forward-biased condition. As forward voltage increases, the current increases rapidly and it increases until a peak point, called as Peak Current, denoted by IP. The voltage at this point is called as Peak Voltage, denoted by VP. This point is indicated by A in the above graph. If the voltage is further increased beyond VP, then the current starts decreasing. It decreases until a point, called as Valley Current, denoted by IV. The voltage at this point is called as Valley Voltage, denoted by VV. This point is indicated by B in the above graph. If the voltage is increased further, the current increases as in a normal diode. For larger values of forward voltage, the current increases further beyond. If we consider the diode is in reverse-biased condition, then the diode acts as an excellent conductor as the reverse voltage increases. The diode here acts as in a negative resistance region. Applications of Tunnel diode There are many applications for tunnel diode such as − Used as a high-Speed Switching device Used as a memory storage device Used in Microwave oscillators Used in relaxation oscillators Schottky Diode This is a special type of diode in which a PN junction is replaced by a metal semiconductor junction. The P-type semiconductor in a normal PN junction diode is replaced by a metal and N-type material is joined to the metal. This combination has no depletion region between them. The following figure shows the Schottky diode and its symbol. Schottky Diode The metal used in this Schottky diode may be gold, silver, platinum or tungsten etc. As well, for the semiconductor material other than silicon, gallium arsenide is mostly used. Image Schottky Diode Operation When no voltage is applied or when the circuit is unbiased, the electrons in the N-type material has lower energy level than the ones in the metal. If the diode is then forward biased, these electrons in the N-type gain some energy and move with some higher energy. Hence these electrons are called as Hot Carriers. The following figure shows a Schottky diode connected in a circuit. Operation Advantages There are many advantages of Schottky diode such as − It is a unipolar device and hence no reverse currents are formed. Its forward resistance is low. Voltage drops are very low. Rectification is fast and easy with the Schottky diode. There is no depletion region present and hence, no junction capacitance. So, the diode gets to OFF position quickly.
  • Recorded Live Class
    • Introduction to Diode: What is Diode ? V-I characteristics of the Diode Explained
  • Recorded Live Class
    • Introduction to Zener Diodes
  • Dc Power Supply and describe
    • DC Power Supply Introduction This article will take an in-depth look at DC/DC power supplies: What is a DC/DC Power Supply? Types of DC/DC Power Supplies Basics of DC/DC Power Supplies Mounting and Package Choices Applications of DC/DC Power Supplies
  • Full Wave bridge Rectifier
    • ridge Rectifier - It has four diodes that allow conversion of both positive and negative half cycles of AC input into DC. The output voltage from this rectifier could be almost twice that of a full-wave center-tapped transformer rectifier. Center-Tap Rectifier - This full-wave rectifier circuit utilizes a center-tapped transformer to which two diodes are connected. Each of the diodes uses the half-cycle of the AC input. Since the AC input provides power to both the halves, this circuit is expected to have high output and efficiency.
  • DC Power
    • dc-power-supplies
  • Full Wave bridge Rectifier
    • full-wave-rectifier-circuit
  • Lecture6: Bipolar Junction Transistor
    • Bipolar Junction Transistor
  • PNP & NPN Transistor
    • PNP & NPN Taansistor
  • Common Basic Collection
    • CB, CE, CC Connection