Junction Field Effect Transistor (JFET) | Working

Engineeering Projects
single ended junction fet

Introduction to Field Effect Transistor (FET) A Field Effect Transistor (FET) is a transistor in which current is controlled by an electric field. A conventional transistor is a bipolar device i.e. current is carried by two types of charge carriers namely electrons and holes. Hence a conventional transistor is referred to as a Bipolar Junction Transistor (BJT). An FET, on the other hand, is a unipolar device i.e. current is carried by only one types of charge carrier namely the majority carriers. What are the Advantage of Field Effect Transistor (FETs)…

Read More

High Low Voltage Cutout Circuit

Engineeering Projects
high low voltage cutout circuit

The protection of electrical and electronic appliances is the main concern these days. Some electronics appliance is very sensitive to voltage i.e. it only functions when adequate voltage is provided. Some appliances were even destroyed due to high and low voltage supply. To solve this type of issue we are posting a very simpler and more useful project called “High Low Voltage Cutout Circuit”. Previously we had already posted various types of appliance protecting circuits on bestengineeringprojects.com like: Auto Cut Circuit for Over and Under Voltage High Current Regulator Circuit…

Read More

Class B Push Pull Amplifier

Engineeering Projects
class b push pull amplifier waveform

In class B push pull amplifier, output current (collector current) flows for only half the cycle of the input signal. Hence distortion is excessive. Single ended operation is, therefore, not possible in class B audio amplifier. Class B audio (un-tuned) amplifier must necessarily use push pull operation to reduce distortion. In effect, in class B push pull amplifier, one transistor say Q1 conduct during one half cycle while the other transistor namely Q2 conducts during the other half cycle. Class A power amplifiers may use either single ended or push…

Read More

Blown Fuse Indicator circuit

Engineeering Projects
blown fuse indicator circuit

Blown fuse indicator circuit of the kind described here provides an ideal solution in such case. It indicates whether fuse is good or blown by generating audio alarm and glowing LED. Circuit Description and Working of Blown Fuse Indicator This circuit is based on 555 timer wired as an astable multivibrator. When the fuse is not blown, positive voltage is applied at junction P (IC’s pins 2 and 6) through R2 and D1. This holds the voltage at the junction above 2/3 Vcc and prevents the IC from oscillating. When…

Read More

Pushpull Amplifier | Merits of Pushpull Operation

Engineeering Projects
pushpull amplifier using two transistors

In a power amplifier using only one transistor, referred to as single ended amplifier, in spite of all care in design and operation, appreciable distortion results due to non-linearity of transfer characteristics. Such a distortion may be greatly reduced by using pushpull operation employing two transistors in a single stage as shown in figure 1. In the pushpull amplifier, the input signal is applied to the input of the two transistors through a centre tapped transformer TR1. Then the voltages V1 and V2 across the two halves of the center…

Read More

Arduino GPS Digital Clock

Engineeering Projects
gps clock

GPS (Global Positioning System) is getting more popular these days because of its application and uses in electronic project. Today, we are going to build a digital cock solely based on GPS module. The project “Arduino GPS Digital Clock” collects information from the satellite in the form of 70-character long string and show only date and time. In this article we will show you how to extract exact date and time from the string ($GPRMC) that received by GPS Module. Components used in Arduino GPS Digital Clock Arduino UNO Board…

Read More

Negative Feedback Amplifier Circuit | Merits

Engineeering Projects
two stage rc coupled amplifier with voltage series negative feedback

Negative feedback, no doubt, reduces the gain of an amplifier. Despite this drawback, negative feedback is popularly used in amplifiers because of its various merits discussed below. Stability of Gain Negative feedback results in increased stability of gain of the amplifier despite variations in the values of circuit components and device (BJT and FET) parameters caused due to such factors as temperature change, aging, replacement of circuit components, and supply voltage variation. Consider the feedback equation: Usually we keep . Then the feedback equation reduces to the following form:          …

Read More

Self Resetting LDR Alarm using Timer IC 555

Engineeering Projects
self resetting ldr alarm using timer ic 555

One of the most common projects made in electronics is burglar alarm or security alarm. If your search over the internet there are dozen of burglar or security alarms but the problem with this circuit is, it does not have a self-resetting option i.e. continuously sounds till someone switches off the system. Thus, in order to solve this type of problem (self-resetting) we have come with the project Self Resetting LDR Alarm using Timer IC 555. This circuit detects the interruption of light and produces sound for a definite interval…

Read More

Feedback in Amplifiers | Feedback Techniques

Engineeering Projects
block diagram of feedback amplifier

What is Feedback? What is Feedback in Amplifier? Feedback: Feedback is a phenomenon of universal importance and has, therefore, entered the general vocabulary. Thus, consider the following situation: you are an officer. You have instructed a subordinate to do a certain job. After some time, the person informs you about the state of job, whether satisfactorily completed or there are some difficulties. Thus, information constitutes the feedback. You definitely want this feedback to ensure that the job was been done; if not then what corrective measures are to be adopted.…

Read More

Delay Starter using 556 Dual Timer IC

Engineeering Projects
delay starter using 556 dual timer IC

Delay Starter using 556 Dual Timer IC: The systems using compressors such as air conditioners, refrigerators, freezers etc. are to be cared for properly to avoid damage to the compressor due to fluctuations in the line voltage. After switch off, if is switched on immediately, the compressor may fail. This is avoided by connecting it through DOL (direct on line) starter. The DOL starter trips the supply as the power fails. When the power resumes, the starter has to be started manually. But the presence of an operator round the…

Read More
  1. Pages:
  3. 1
  4. ...
  5. 23
  6. 24
  7. 25
  8. 26
  9. 27
  10. 28
  11. 29
  12. ...
  13. 84