Category: Electronics Projects

High Current Regulator Circuit

Engineeering Projects
linear high current regulator circuit

The high current regulator circuit can be delivering up to 3-amp load current continuously. The output voltage can be set in the range of 4V to 22V. Fine variation in the output voltage can also be done using a potentiometer VR3. The output current, ranging from 350mA to 3000mA can be varied by potentiometer VR1. Circuit Description of High Current Regulator Circuit The high current regulator circuit given here utilizes all the advantages of the operational amplifier LM3140 (IC1). It has very high input impedance, high gain, high CMRR, low…

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Speech Filter Circuit

Engineeering Projects
circuit diagram of speech bandpass filter using LM387

A speech filter circuit is a broadband filter and is also called a wide bandpass filter circuit because its bandwidth is restricted to the speech frequency. It can be formed by simple cascading high pass and low pass section and is generally the choice for simplicity of design and performance through such a circuit can be realized by a number of the possible circuits. The butter-worth filter is generally used in audio systems which are characterized by a maximally flat-flat filter. Description of Speech Filter Circuit: A speech filter using…

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24 Hour Digital Clock and Timer Circuit

Engineeering Projects
digital timer cum clock circuit

Electronic circuits are usually designed for a specific purpose, which means one circuit performs only one task, in general cases. This circuit here, “24-Hour Digital Clock and  Timer Circuit” is a simple circuit with two different applications as reflected through the name 24-hour clock and a timer. The Circuit of a versatile 24-Hour Digital Clock and Timer Circuit is described below in detail. First, let’s go with some of its unique features. Various Other timer and clock circuits are posted in bestengineeringprojects.com Industrial Timer Circuit Countdown Timer using Arduino Programmable…

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DTMF Based Remote Control System

Engineeering Projects
dtmf based remote controller transmitter unit

Different gadgets have been introduced to meet our requirements ranging from basic needs to classy needs of humans. With this development in recent years, day by day people has grown more sophisticated. Putting human comfort as a main concern, hereby we have presented a circuit to remotely control several electrical or electronic gadgets connected to it. The unique feature of the circuit DTMF-based remote control system in comparison to other remote control systems like IR remote control is that this circuit employs FM transmission and reception, for this reason, it…

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Pest Repeller Circuit

Engineeering Projects
circuit diagram of pest repeller

No matter how far we try to escape from pest’s trap or we attempt to clean the surrounding around us, we get eventually bothered being followed everywhere from kitchen to every corners of our house. Different pest repeller circuits have been developed claiming to escort people through this problem. However, pest repeller circuits thus built are found to have low power output resulting poor effectiveness. And, this error gives no solution to our trouble. With this point as our main concern, we have presented a powerful pest repeller circuit that…

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Proximity Detector Circuit Using 555 timer IC

Engineeering Projects
circuit diagram of proximity detector transmitter

Entire project of proximity detector circuit is built with infrared transmitter, infrared receiver and 555 timer IC (such as using Seimens SFH50638 in TV sets). Proximity detector circuit, anyone can guess the operation performed by this circuit just with the name it is provided with. Infrared diode is the main soul of proximity detector circuit which is used in different equipment’s like burglar alarms, touch-free proximity switches for turning a light on, and solenoid controlled valves for operating a water tap. Description of Proximity Detector Circuit Using 555 timer IC Transmitter…

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RF Probe Circuit

Engineeering Projects
circuit diagram of RF probe

In order to measure the RMS voltage between two specific points, employing heavy and bulky electronic devices sounds unusual. And, therefore a small handy instrument can be used to avoid such situations where the voltage (i.e. RMS) between two points at any distance; large or small can be determined. For this reason, the instrument RF probe circuit has been proven of great help for home users as well as for communication equipment service/design labs. Description and Working of RF Probe Circuit RF probe circuit is just an instrument to measure, in…

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Simple Drummer Project Using Timer 555

Engineeering Projects
circuit diagram of drummer using 555

Timer IC 555 is a low-cost high performance and very popular IC and is used in most circuits. On this website, we have posted various electronic projects using ic 555. Now here, is a simple project called Simple Drummer Project Using Timer 555 which gives an hour of entertainment. Circuit Description of Simple Drummer Project Using Timer 555 The circuit of a simple drummer project is built around NE555 followed by a few passive components. The circuit posted here is simply a triggering circuit whose time is adjusted by variable resistor…

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Simple Siren Circuit using CD7400

Engineeering Projects
circuit diagram of electronic siren

Various types of siren circuit like electronic siren, toy siren, warning siren etc. are already posted in bestengineeringrpojects.com . Now here in one another simple siren circuit using popular and low-cost NAND gate IC (CD4700), which gives hour of entertainment and also can be used in toy. Description of Simple Siren Circuit using CD7400 Siren circuit is build around NAND gate IC (CD7400), a PNP transistor (SK100B) and few passive components. In this circuit we use only half part of IC1. NAND gates N1 and N2 are wired as low…

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Digital Voltmeter (DVM) Circuit Using ICL-7107

Engineeering Projects
circuit diagram of digital voltmeter

A digital voltmeter (DVM) Circuit displays measurements of AC or DC voltage as discrete numerals instead of a pointer deflection on a continuous scale as in analog instruments. Digital Voltmeter Circuit is a versatile and accurate instrument that is employed in many laboratory measurement applications. Because of the development and perfection of the IC modules, the size, power requirement, and cost of the digital voltmeter as been drastically reduced, and therefore, digital voltmeter circuits can actively compete with the conventional analog instruments in price, portability, and accuracy. Here, in this…

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