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Why Does My Old Phone Charge Slowly But Heat Up More?

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The Truth About Aging Batteries Welcome back to Hobitronics — where we decode the daily mysteries inside your gadgets. Today we’re getting into something everyone with a 3-year-old smartphone has asked themselves: "Why is my phone charging so slow? And why does it feel like it’s cooking itself while doing it?" You’re not imagining it. Aging phones really do charge slower and heat up more — and the reason lies deep inside the battery chemistry , internal resistance , and the invisible wear and tear of thousands of charging cycles. 1. Your Battery Ages — Even If It Looks Fine Smartphones use Li-ion or Li-Po batteries . These are fantastic when new, but over time: Electrochemical reactions degrade the anode/cathode SEI (Solid Electrolyte Interface) layer thickens Lithium plating reduces active ions Capacity drops with every charge-discharge cycle This degradation results in something very important: higher internal resistance . 2. Internal Resistance: Th...
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Pulse Code Modulation (PCM): The Digital Backbone of Modern Communication

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Introduction: Why PCM Matters In the era of smartphones, digital streaming, and cloud-based communication, it's easy to forget that all digital information starts out analog. Whether it’s your voice, your favorite song, or a movie’s soundtrack, sound begins as a continuously varying signal. But to store, transmit, or process it digitally, we need to convert it into a digital form—and that's where Pulse Code Modulation (PCM) comes in. PCM is the foundation of digital audio , and it plays a crucial role in telecommunications, media storage, and even space communication. Let’s dive deep into how it works, why it’s important, and where it’s used. What is PCM? Pulse Code Modulation (PCM) is a method used to digitally represent analog signals. It involves sampling , quantizing , and encoding an analog input into a binary form suitable for transmission or storage. Think of PCM as translating a wave of sound into a digital language that machines can understand. The Three Core P...
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Why Do Phone Chargers Get Hot While Charging?

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Controlling RGB LEDs with PWM Using Arduino

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Science Behind the Taste Change Welcome to the Hobitronics blog — a space where everyday curiosities about electronics and appliances get the deep respect they deserve. You're not just asking "Why does tea taste off when I use an induction stove?" You're asking one of the most nuanced, beautifully human questions: "What really happens under the hood of our everyday devices?" And that is exactly what Hobitronics is here for — to make the complex beautiful, relatable, and fun. This is part of our series where we decode the science of consumer electronics that people use every day but rarely understand. So let’s talk about tea☕. Me? Personally? My day doesn't start without a hot cup of tea. No offense to the coffee gang, but my favorite will always be the simple, soul-healing cup of tea. But if you’ve ever made tea on an induction stove ... you might’ve noticed something strange: It overboils too quickly The tea turns slightly bitter The milk...
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If PWM is the brain signal, the MOSFET is the muscle that makes it move. From your Arduino's motor shield to your laptop charger and even your electric vehicle's inverter — MOSFETs silently power modern electronics with unmatched speed and precision. In this blog, we’ll break down how MOSFETs work, where they’re used, and how they bring digital control to life — especially when combined with PWM. In this blog, we’ll break down: What a MOSFET is How it works with PWM Real-world uses (motors, LEDs, inverters, etc.) Pro design tips for safe and effective usage 1. What is a MOSFET? MOSFET stands for Metal-Oxide-Semiconductor Field-Effect Transistor .   It’s a type of transistor widely used for switching and amplification , especially in high-speed, high-efficiency applications . Key Roles: Acts like a gate-controlled switch — voltage on the Gate decides whether current flows. Used to control large loads using small digital signals (e.g., from microcontr...
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