LED Stop Watch Circuit

Engineeering Projects
led stop watch circuit

ICs 555 and 4017 are well-known to electronics hobbyists. Presented here is a very interesting project of an LED stopwatch Circuit using timer 555 and decade counter 4017 ICs. This stopwatch is able to monitor time from one second to 60 minutes. It can be used in sports, laboratories, etc. IC 555 (IC1) is the heart of the circuit. It is used in astable multivibrator mode. The special feature of this mode is that if this pin 4 of IC1  is kept at a high logic, it produces a clock…

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3D Ball, graphics based project on C++

Engineeering Projects

Introduction to 3D Ball, graphics based project Here is a C++ based project called 3D Ball, graphics based project which shows objects in three dimensional view. To make object look much more realistic, here different features of graphics based on C++ is used. Initially the vertex table of the object is formed and then proceeding by rotation and translation. This program has facilities of rotation, transformation of 3D structure object etc. Check out other interesting C++ projects posted in bestengineeringprojects.com  Telephone Diary using C++ Employee Management System Using C++ Base Conversion based…

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How to Build a Reliable Ni-Cd Battery Charging Circuit: Step-by-Step Guide

Engineeering Projects
Ni-Cd battery charger circuit

Introduction to Ni-Cd Battery Charger Circuits Nickel-cadmium (Ni-Cd) batteries are commonly found in all sorts of household electronics and gadgets. Because these batteries go through frequent use and constant charging and discharging, having a dependable and efficient charger is essential. In this guide, we’ll walk you through a tried-and-true Ni-Cd battery charging circuit designed to safely recharge your batteries while including important protection features to keep everything running smoothly. Features of the Ni-Cd Battery Charger Circuit This Ni-Cd battery charger is designed to charge seven Ni-Cd pencil cells in series…

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Steam Whistle Circuit using 741 IC

Engineeering Projects
steam whistle circuit

The project “Steam Whistle Circuit using 741 IC” produces a sound similar to that of a steam locomotive whistle. Here, in the circuit Transistor T1 and T2 from a multivibrator, the frequency of which is set by preset VR3. This is the ‘toot’ part of the whistle. Transistor T4 amplifies white noise generated across the reverse-biased transistor T3. White noise and toot mixed by IC1. The ratio of these is set by preset VR2. IC1 is the most popular and low-cost IC 741 and is used as a low-frequency multivibrator,…

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Temperature controlled oscillator Circuit

Engineeering Projects
temperature controlled oscillator circuit

Output frequency or tone of the project temperature controlled oscillator circuit varies with the temperature at which the input germanium diode is held. Reverse resistance of D1 varies from 500-Ω to 10 KΩ, when temperature varies between 200C and 800C. (At higher temperature germanium devices show very low resistance.) This variation of resistance changes the tone of the output sound of the oscillator which is built around the AF amplifier IC (IC1). Instead of germanium diode, base-emitter junction of an ordinary medium-power transistor such as AC128, AC188, 2N360 or 2N610…

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LED Volume Indicator Circuit

Engineeering Projects
Stereo balance indicator

The Project LED volume indicator circuit can be used in stereo amplifiers to indicate the balance level of volume. As the human ear is not much sensitive to differences in sound level, the LED volume indicator circuit indicates the difference in the sound level in any channel by means of LED. Input to the circuit is taken from the output terminals of each channel. The output signals are rectified by diodes D1 and D2, which are further filtered by capacitors C1 and C2. A DC voltage is developed across the…

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Temperature controlled soldering iron station

Engineeering Projects
temperature controlled soldering iron station

Temperature-controlled soldering stations are now readily available in the market. Such instruments use thermocouples or thermistors as temperature sensors. But even if it’s available in markets it’s fun and experience to build this device yourself.  An electronics hobbyist would surely like to build this unit to enhance the working life of his soldering iron bit and to save power. With a basic knowledge of comparators, this circuit “Temperature controlled soldering iron station” is very easy to understand. Transistor T1 BC107 is used here as a temperature sensor. The fact that…

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Simple Lie Detector Circuit

Engineeering Projects
lie detector circuit

What is Lie Detector Circuit? The instrument used to find whether a person is speaking the truth or not is called a lie detector or polygraph. It records the heartbeats, blood pressure, and body temperature, and tension level of the person undergoing the detector test. General questions along with other relevant questions are asked to the subject. When the person tries to speak lies, his body physiology changes. These changes are recorded and compared with the results that are obtained for normal questions. Such sophisticated instruments can however give wrong…

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Three Bit flash Analog to Digital Converter Circuit

Engineeering Projects
flash analog to digital converter circuit

The flash type converter is the simplest and the fastest type of analog to digital converter. The entire digital output word is present just after the propagation delay time of comparators and the encoding logic gates. A typical conversion time of a three-bit flash analog to a digital converter is 33 ns. The circuit of a three-bit flash analog to digital converter shown in figure 1, needs just three comparators and no combinational logic circuitry. Circuit Description of Three Bit Flash Analog to Digital Converter In this circuit, the reference…

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Advance Math Table using C Programming

Engineeering Projects

The object of the project is to create an application that can calculate math tables. The Math Table using the ‘C’ application is created to make students’ maths skills better. The application or program created from this project includes the option like to enter the user name, the option to practice table, the option to choose a table for practice, the option to check whether the answer is right or wrong and correct it, show the number of wrongs and right answer, and final option to practice again. The project…

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