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The 1.25V Trick That Gives You Any Voltage You Want

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About The 1.25V Trick That Gives You Any Voltage You Want

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Learn how voltage regulators actually work and how to design and build one. Check out PCBWAY➡️ https://www.pcbway.com/ for PCB's, 3D printing and CNC at expectational value and design PCB's with Altium ➡️ http://altium.com/yt/engineeringmindset Learn how an LM317 adjustable voltage regulator turns unregulated DC into a smooth, stable output for electronics projects. In this video, we build a DIY adjustable power supply, explain how resistors and a potentiometer set the output voltage, explore dropout voltage, heat dissipation, protection diodes, filter capacitors, and even look inside the regulator using a laser teardown to understand how it really works. Perfect for beginners learning electronics, PCB design, and power supply circuits. 🛠️ Build the kit yourself 🛠️ Want to build the kit at home, click here:👉 https://tinyurl.com/Voltage-Regulator-Kit Want to order just the PCB, click here:👉 https://tinyurl.com/Order-PCB Coupon Code: PCBWay-TEM10 🎁 Design, review, and manage PCBs in one connected environment with Altium Designer. Get a 30-day free trial here ➡️ http://altium.com/yt/engineeringmindset **PCBWAY Promotional Code T&C** Coupon Code: PCBWay-TEM10 Offer: $10 off orders over $30 Applicable Services: PCB (Assembly), CNC, 3D Printing, and other PCBWay services (excluding shipping) Validity: The code is available for 3 months and expires 6 months after each individual redemption Redemption Limit: One-time use per person Quantity: 200 codes available ✨ With special thanks to these amazing people ✨ A. Cabello, R Charlery, T Champion, R. Elskamp, Wiggie, P Bramble, R. Liu, M Bellis, C. Eastman, W. Schnur, davekroil, U Pehlivanoğlu. ⚡🛠️ TOOLS YOU NEED 🛠️⚡ ******************************* Get this electronics book ➡️ https://amzn.to/41cCJPk Professional Multimeter -➡️ https://amzn.to/3xu2Vaw Good multimeter -➡️ https://amzn.to/3xrbuTd Professional clamp meter ➡️ https://amzn.to/4140FnK Good Clamp meter ➡️ https://amzn.to/3xqt2is Outlet tester ➡️- https://amzn.to/3kavg2l Energy monitoring plug ➡️ https://amzn.to/3SkfPl7 Battery tester -➡️ https://amzn.to/3S3fHWI Basic electronics ➡️ kit https://amzn.to/3xuLiqS MY FAVOURITE GEAR 🎥 My camera - https://amzn.to/3YCZ7Q9 🎤 My Microphone - https://amzn.to/3YYXsUC ⌨️ My Keyboard - https://amzn.to/3lBsl33 🖥️ My monitor - https://amzn.to/415BGjW 🎧 My headphones - https://amzn.to/3lN7R7u 👋 SOCIALISE WITH US 👋 ******************************* 👉FACEBOOK: https://facebook.com/theengineeringmindset/ 👉TWITTER: https://twitter.com/TheEngMindset 👉INSTAGRAM: https://instagram.com/engineeringmindset/ 👉WEBSITE: Http://TheEngineeringMindset.com 00:00 Introduction: How Adjustable Voltage Regulators Work 00:23 Why We Need Voltage Regulators in Electronics 01:11 Fixed vs Adjustable Voltage Regulators Explained 01:44 LM317 Voltage Regulator Pinout & Circuit Overview 02:32 The Hidden 1.25V Reference Inside the LM317 02:47 How Resistors Set the Output Voltage 03:04 Voltage Regulators in Real Electronic Devices 04:26 Voltage Divider Theory for LM317 Circuits 05:06 The LM317 Constant Current Trick Explained 06:02 How the LM317 Calculates Output Voltage 06:55 How a Potentiometer Controls Voltage 07:30 Common Potentiometer Failure Modes & Protection 09:03 Why Linking Potentiometer Pins Improves Reliability 09:41 Preventing Unstable Low-Voltage Operation 10:24 LM317 Output Voltage Formula Explained 10:48 Choosing the Correct Potentiometer Value 12:00 LM317 Dropout Voltage & Input Voltage Requirements 12:46 Reverse Polarity Protection with Diodes 13:45 Why Linear Regulators Get Hot 14:26 Heat Sinks, Insulation & Thermal Management 15:11 Input Filtering Capacitors Explained 16:04 Output Capacitors & Load Transient Response 16:37 Reducing Noise with the Adjust Pin Capacitor 17:05 Protection Diodes for LM317 Stability 17:52 Power Indicator LED Design Considerations 18:50 Inside the LM317: Laser Teardown & Internal Circuit 19:24 LM317 Internal Components Explained 20:43 How the Voltage Reference Works 21:27 Op-Amp Feedback Control Explained 23:28 LM317 Regulation Example Step-by-Step 25:24 Building the Adjustable Power Supply Yourself 26:37 Breadboard Testing & PCB Assembly Guide

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