Category: Switching and Controlling

DIY Light Detector Circuit using LED

Engineeering Projects
circuit diagram of light detector using LED

Today we come with a unique idea i.e. Photodiode using LED. This project utilized an LED to detect and respond to the presence and absence of light. Before starting the description and working of circuit DIY Light Detector Circuit using LED, we would like to describe a few electronics components. LED: Light-emitting diode is a photoelectric device that converts electrical energy into light energy. It is a heavily doped P-N junction diode that under forwarding bias emits spontaneous radiation. Photodiode: Photodiode is an optoelectronic device in which current carriers are…

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Solder Fumes Extractor Circuit

Engineeering Projects
solder fume extractor circuit

Solder Fumes Extractor Circuit: Soldering in electronics is analogous to fixing a component using glue. It is a general phenomenon in the field of electronics that involves fixing electronic components into a special board called PCB with the help of instruments like soldering iron and electrical solder commonly called ‘Solder wire’. While soldering we all face the problem of toxic fumes. These fumes are of lead solder wire and flux. Combinedly, these fumes are highly toxic if an excess amount is inhaled. To solve this problem, here we designed a…

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Digital AC/DC Voltage cum Continuity Tester

Engineeering Projects
Digital AC DC Voltage Cum Continuity Tester

The project “Digital AC/DC Voltage cum Continuity tester” can be used to test 25 Volts to 500 volts AC/DC voltage continuity and open-circuit condition by displaying on the 7-segment display. There is the various advantage of “Digital AC/DC Voltage cum Continuity tester” over multimeter are Small Size, low cost, easy operation and requires no troublesome selector switch to select testing mode. To make a selector switch free circuit, we had used 82K impedance for DC and 220K impedance for AC. The testing procedure is very simple all you have to…

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Phase Sequence Change Indicator

Engineeering Projects
3-phase sequence change indicator

The project phase sequence change indicator using 555 IC is used to indicate whether there is a change in phase sequence occurring or not by a beeper or a LED. We all know that in three-phase motor phase sequence is important because the change in phase sequence may cause trouble in machines. Circuit Description of Phase Sequence Change Indicator The circuit of phase sequence change indicator is divided into two main sections i.e. controlling section and the beeper section. The circuit of the phase sequence change indicator is shown in…

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Simple Battery Changeover Relay

Engineeering Projects
circuit diagram of battery changeover relay

It is economical to use a battery eliminator but with frequent power failure in most developing countries, it becomes annoying to change over from battery eliminator to battery operation every time the electric supply fails. Thus, we had designed a simple battery changeover relay. A simple way to avoid the nuisance is by connecting the battery and power pack in parallel. But the advantage with such a system is that when the eliminator voltage falls, even slightly (say from 6V to 5V), though the performance of the set remains unaffected,…

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Rotation Sensor using 555 IC

Engineeering Projects
circuit diagram of rotation sensor using 555IC

In this section, we discuss another application of the most popular IC, the 555 timers. Introduced in 1972 by the Signetics Corporation as a bipolar integrated circuit, the 555 is also available in CMOS technology and from several manufacturers. There are various projects we had already posted in the timer IC 555-based projects section. Now, we have come up with another interesting project called rotation sensor using the most popular IC of all time 555 Timer IC. When more conveyors or equipment are used in the processing system and anyone…

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Single Phasing Preventer Circuit

Engineeering Projects
installation of the preventer

If we have been familiar with machinery, we all know how important it is to follow safety measures to mitigate injuries and accidents. A single phasing preventer circuit is one of the solutions we can look forward to. The phrase ‘preventer circuit’ itself portrays it. The single-phase preventer circuit is also a high low and unbalanced-supply voltage cut-off relay. To ensure complete safety for 3-phase machinery, the preventer circuit has been known to be handy. Generally, an induction motor burns out due to excessive voltage during an off-hour, a very…

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AC Motor Speed Controller Circuit Using AT89C51

Engineeering Projects
author prototype of ac motor speed controller

Here is a simple circuit “AC Motor Speed Controller Circuit Using Microcontroller” which is used to control the speed of AC motor using microcontroller At89c51. The circuit uses the principle of changing the firing angle of TRIAC to control the speed of the motor. Here, in this project, we had to use various switches to control the speed whereas an LED bar graph is used to indicate the speed of the motor. Circuit Description of AC Motor Speed Controller Circuit Using AT89C51 The circuit diagram of the signal phase AC…

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Op-Amp 741 Based Sound Operated Light

Engineeering Projects
circuit diagram of sound operated light

Op-Amp 741 Based Sound Operated Light Circuit Diagram, Circuit Description with Working Principle and Parts List Introduction to Op-Amp 741 Based Sound Operated Light In contrast to where so far the technological development has brought us, this project might seem so plain, but it is a basic project that supports advanced projects, helps newcomers in the electronics field to understand the fundamentals, and being much economical provides extra credits to the users. This mini-project op-amp 741 Based Sound Operate Light builds up a small gadget/device which can be employed to turn…

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Load Protector Circuit and Remote Switching

Engineeering Projects
circuit diagram of load protector with remote switching facility

Introduction | Load Protector Circuit and Remote Switching Have you ever noticed the number of devices used at your house to serve your purpose? There are many. These devices require a specified rate of power to operate. Maximum variations in voltage/ power and load can destroy most of the devices like inverters and UPS systems since it can cause excessive heating of the output transformer windings and the active driving device and thereby damage them. And, some domestic appliances also need to be protected against under/over-voltage. This particular circuit serves the…

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