Category: Electronics Projects

Constant-Current Battery Charger Circuit with Protection

Engineeering Projects
constant current battery charger circuit with protection

Ever wished your battery charger could do more than, well, charge? What if it could be smart enough to know when your battery’s full or even warn you when it’s about to run out of juice? That’s the magic of the Constant-Current Battery Charger Circuit with Protection. It’s like the caring friend who not only lends you a hand but also ensures you’re on the right track. Let’s explore this innovative circuit that charges your battery efficiently and keeps it safe from overcharging and deep discharge. Why Constant-Current Charging? Think…

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Dual-Timer NE556 Circuit for Generating Adjustable 5-Second and 1-Second Pulses

Engineeering Projects
ne556 circuit for generating pulse

There’s something undeniably magical about creating a circuit that pulses like a heartbeat, ticking away with precision. That’s what this Dual-Timer NE556 Circuit is all about—it’s a simple yet powerful design that spits out two different pulse durations, one after the other, like clockwork. If you love tinkering or need a timing solution, this little gadget is your new best friend. What Does It Do? Imagine standing in a room, flipping a light switch on and off every five seconds. Now, imagine that after every “off,” someone else presses another…

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Arduino Fastest Finger First Game with LEDs and Reset Button

Engineeering Projects
Arduino Fastest Finger First Game with LEDs and Reset Button Prototype

Have you ever had one of those moments where you’re competing with friends and wish there was a fun way to see who got the fastest reflexes? Here’s your answer: an Arduino-based Fastest Finger First game with LEDs! There are no complex displays, no 7-segment numbers to deal with—just good ol’ LEDs lighting up for the winner and a dedicated reset button to start fresh. If you’re a fan of simple yet engaging DIY projects, this one will light up your world—literally and figuratively. So, let’s dive in! What’s This…

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Fastest Finger First Circuit with 7-Segment Display and Alarm

Engineeering Projects
Fastest Finger First Circuit with 7-Segment Display and Alarm

Imagine you’re on stage, heart pounding, eyes locked on the big screen in front of you. The host asks the final question—this is it. Your reflexes are sharp, your hand hovers over the buzzer, and then BAM! You slam that button down faster than a cheetah chasing its dinner. But how does the system know you were the first? That’s where the Fastest Finger First Circuit steps in. This little piece of engineering magic can make or break a game show, quiz night, or classroom competition. Today, we’re diving into…

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Arduino Light Meter: Measure Ambient Light with OLED Display

Engineeering Projects
arduino light meter prototype

Ever found yourself squinting at a bright day, thinking, “How much light is actually hitting my face?” Well, using an Arduino light meter that guesswork is gone. You’re practically giving your Arduino a pair of shades, but this one isn’t there to block the light-it’s there to measure it. Sounds cool, right? Let’s dive in. Why Build a Light Meter? Imagine having a gadget that tells you how bright your workspace is, or whether your plants are getting enough sunlight. That’s the power of this little project. Using an ambient…

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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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Dual-Priority Encoder Circuit with 74148 and 74266 ICs

Engineeering Projects
Dual-Priority Encoder Circuit with 74148 and 74266 ICs

Imagine this: you’re a traffic cop in the middle of a very busy intersection. Cars from every direction are honking, each one demanding to go first. You’ve gotta make a decision, right? Now, picture that some of these cars have more “urgency” than others—maybe an ambulance is in the mix, but there’s also a VIP car behind it. Wouldn’t it be useful to know not only who needs to go first but also who should go second? Well, in the world of digital electronics, that’s what we’re doing with this…

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Programmable Attenuator Circuit Using OP07 and CD4052

Engineeering Projects
Programmable Attenuator Circuit Using OP07 and CD4052

Accuracy and control are especially in great demand in the domain of test and measurement systems in today’s digital world. For that reason, there is much room for improvement in the design of the digitally controlled programmable attenuator circuit in terms of accuracy and flexibility of signal processing. The following article guides on how to design a programmable attenuator circuit with the OP07 operational amplifier and CD4052 analog multiplexer. Combining them yields a high degree of signal attenuation in a digitally controlled manner, quite essential in instrumentation and test or…

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