Category: Switching and Controlling

DIY Digitally Controlled Variable DC Power Supply (1.25V to 15.19V) Using LM317 and 4029 Counter

Engineeering Projects
DIY Digitally Controlled Variable DC Power Supply

Imagine being able to control voltage like turning a volume knob, only instead of sound, you’re tuning up or down the power flowing to your electronics. Today, we’re going to create a variable DC power supply with digital controls, using a few nifty components that make this process not just adjustable, but satisfyingly precise. Building this digitally controlled variable DC power supply might sound complex, but I promise it’s like baking with a recipe—it just takes the right steps. So, let’s dive into it. Why Go Digital with Voltage Control?…

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How to Make Relay Switch Circuit

Engineeering Projects
relay switch circuit

In this tutorial, you will learn how to make your relay switch circuit for Arduino in a few easy steps. We often see many electronics hobbyists especially Arduino users buy expensive relay modules instead of building their own. The general price of the relay module found in the market is about $2 but you can make your own for less than $0.70. In the tutorial Relay Switch circuit for Arduino, you will learn Relay and Operating principle Pin Identification of Relay Component value calculation and choosing the best for your…

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Single Phase Preventer with Under/Over Voltage Cutout

Engineeering Projects
single phase preventer with under over voltage cutout

For a 3-phase induction motor, all three phases of the supply must be present. If any of the phases is missing, or a fuse is blown, the motor will continue to run with two phases only. But in that case, it will draw a very large current, and it may burn unless switched off immediately. To solve this problem the project “Single Phase Preventer with Under/Over Voltage Cutout” is posted here. For the protection of a three-phase induction motor, various types of starters are utilized. But the problem with Starters…

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Light Sensor Switch Circuit using LDR and 741 IC

Engineeering Projects
light switching circuit

There are some projects from which every electronics hobbyist starts their journey toward electronics. Same like another hobbyist I had also started my journey of electronics projects by making a very basic project called a light-operated switch using a single transistor. After six long years of the journey today, I had again come up with a basic project which will surely help beginners. The project posted here is of Light Sensor Switch Circuit using LDR and 741 IC. The project switches on the electrical bulb according to the intensity of…

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Touch Switch Circuit using Transistor

Engineeering Projects
touch switch circuit using bc547

Today, I have come up with another simple but very applicable project ‘Touch Switch Circuit using Transistor’. With this simple project, you can modify your existing electrical/ electronic appliance with a modern touch facility. A few days earlier I bought a reading lamp from one of the Chinese stores, the design of the Chinese product is quite impressive. The thing that motivates me to write this post is touch facilities i.e. you can on and off the lamp by simply touching the touch plate. The circuit posted here used two…

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Motor Controller Circuit for Washing Machine

Engineeering Projects
motor controller circuit for washing machine using 555

Washing machines have been an important part of our daily life. But, the issues we have to deal with in a few months of using them make it more difficult. Previously, we had already posted the Automatic Washing Machine control circuit. It is because most of the washing machines have a single-phase motor incorporated in the system and the timing and direction of the motor are controlled by an external mechanical switch which gets worn out so easily and is not economical on the other hand. And, the project “Motor…

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Offline UPS Circuit

Engineeering Projects
inverter section and changeover section

Introduction to Offline UPS Circuit We all know that most electrical and electronic appliances are solely powered by the AC supply and the problem arises when the power is cut off in the middle or there is no power at all. In such cases, uninterrupted supplies are what we look out for. This is one of those uninterrupted power supply circuits. The fact that it provides an instant power supply from the batteries than standby generators that take long to operate, makes it more practical. To make the use of…

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CCTV Switcher Circuit using Timer IC 555

Engineeering Projects
cctv switcher circuit using 555 ic

Here is a simple project CCTV Switcher circuit using timer IC 555 and decade counter IC 4017. The basic function of this project is to switch between different CCTV cameras sequentially i.e. one CCTV output is displayed on TV at a time. A CCTV (Closed Circuit Telephone) camera is used for video surveillance by using a video camera. Sometimes one CCTV camera is not sufficient for surveillance entire area thus we have to use multiple cameras to cover the entire area of surveillance. The circuit posted here control four CCTV…

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IC 555 Based Automatic evening lamp

Engineeering Projects
automatic evening lamp using 555

The project “IC 555 based Automatic Evening Lamp” is simple and built around timer IC 555 and LDR. The bulb used in the circuit is turned on automatically in low light (evening) and turned off in the morning. Various other automatic night lamp circuit is already posted on betsengineeringprojects.com. Some are listed here, Automatic Night Lamp Circuit using TRIAC and SCR, Automatic night lamp using 7486 IC, Light Sensor Switch Circuit using LDR, and 741 IC. The circuit posted here is a standalone automatic evening lamp; simply you have to connect…

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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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