Category: power supply

Battery Charger Circuit Design with LM317 and Relay Control

Engineeering Projects
Battery Charger Circuit Design with LM317 and Relay Control

Imagine that you are in the middle of an important project, and suddenly your batteries run out. That’s frustrating, right? Well, here’s the good news-you can build your very own battery charger circuitry that’s intelligent, efficient, and automatic. Using an LM317 voltage regulator and a relay, this circuit not only charges your batteries but also stops charging once they’re full. Think of it as a responsible babysitter for your batteries! This guide walks you through a simple battery charger design that can safely charge four series-connected AA cells (1.5V each).…

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DIY Variable Power Supply with Auto Shut-Off Using LM7805

Engineeering Projects
Variable Power Supply with Auto Shut-Off Using LM7805

Ever needed a power supply that just, well, works on your terms? Imagine this: you’re in your workshop, deep into an electronics project, and you wish your power supply could give you just the right voltage, no questions asked. And better yet, what if it turned itself off when you’re done? That’s where this DIY Variable Power Supply with Auto Shut-Off, with the trusty LM7805 at its heart, comes in. It’s your reliable “set-it-and-forget-it” friend for every hobbyist in electronics. So, what’s all this about? Think of this that way:…

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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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Efficient Low Dropout MOSFET Regulator with 555 Timer Charge Pump

Engineeering Projects
Efficient Low Dropout MOSFET Regulator with 555 Timer Charge Pump

Efficient power regulation with a minimum drop in voltage has become quite necessary in modern electronics, especially when one works with low-voltage DC supplies. It is in meeting such requirements that a Low Dropout MOSFET Regulator becomes handy-assuring stable output with reduced dissipation of power. The following article elaborates on the design for an Efficient Low Dropout MOSFET Regulator, employing a 555 Timer Charge Pump to develop a higher gate voltage for the MOSFET, thereby realizing ultra-low dropout performance. Why Use a Low Dropout MOSFET Regulator? In conventional linear regulators,…

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Ultra-Low Dropout MOSFET Linear Regulator Circuit with Short-Circuit Protection

Engineeering Projects
MOSFET Linear Regulator Circuit with Short-Circuit Protection

Ever tried building a stable power supply only to find it wastes a ton of power in the form of heat? That’s where this MOSFET-based ultra-low dropout linear voltage regulator comes in handy. This design keeps power losses to a minimum, making it a great choice when you need an efficient, stable 12V output. Plus, it has built-in short-circuit protection, so it’s safe to use in demanding environments. Let’s dive into the details! Why Choose a MOSFET for Ultra-Low Dropout? Traditional regulators can drop quite a bit of voltage, which…

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Building a Programmable Touch Power Supply Circuit

Engineeering Projects
Building a Programmable Touch Power Supply Circuit

Today, many gadgets use touch control – a simple touch makes things happen and adds a modern touch. People who enjoy electronics are creating their power supplies with LM317 variable IC regulators and special switches for power adjustments. There’s a cool project here called the “Programmable Touch Power Supply Circuit” It’s not just a regular power supply – it has touch magic. You can change settings by touching it, mixing tech with simplicity. Imagine devices without buttons – this project uses touch sensors. No searching for buttons – just touch…

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How to Design Power Supply for Electronics Systems

Engineeering Projects
DIY power supply circuit for project

Introduction to Power Supply for Electronics Systems A power supply plays a crucial role in the functioning of electronic systems. Most digital integrated circuits (ICs) require a ±5V supply, while linear ICs such as op-amps and special-purpose ICs need ±15V supplies. In this article, we will discuss a power supply that provides ±5V and ±15V outputs. The Power Supply Circuit: The block diagram of a typical power supply is illustrated in Figure 1. Figure 2 presents the schematic diagram of the power supply, designed to deliver an output voltage of…

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Ripple-Free Short Circuit Protected Variable Power Supply Circuit Design

Engineeering Projects
ripple free short circuit protected variable power supply circuit

Power supply circuits are an essential component of any electronic device, providing the necessary voltage and current required for the smooth operation of the device. A well-designed power supply circuit ensures that the device receives a stable and regulated power supply, preventing damage due to voltage spikes or current surges. In this article, we will discuss a ripple-free short circuit-protected variable power supply circuit design which is a highly efficient and reliable circuit that can provide precise and stable voltage and current outputs. The circuit is designed to maintain a…

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AC Mains Voltage Indicator Circuit

Engineeering Projects
ac mains voltage indicator

An AC mains voltage indicator circuit is a very useful device that indicates the different levels of the mains voltage. This circuit utilizes three different LEDs to indicate the different ranges of voltage i.e. Low, Nominal, and High. It is important to know this information when you are working with electrical equipment because it can help you ensure that everything is working properly and that you are not overloading the circuit. Fortunately, you don’t need to be an electrical expert to build an AC mains voltage indicator. In fact, even…

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10A Laboratory Power Supply Circuit

Engineeering Projects
10A laboratory power supply circuit

A good high-power laboratory power supply must-have device for electronic enthusiasm. As being electronic enthusiastic we all love to design our own bench power supply. So here in this article, you will learn to design your own variable current and voltage 10A laboratory power supply circuit. Features of 10A Laboratory Power Supply Circuit: Users can select voltage and current as per the requirement Constant current mode Short circuit indication and protection Voltmeter and ammeter Fuse for extra protection Applications It can be used as a general variable power supply. It…

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