Intelligent 220v Tester. #electronic #electric #diyprojects #Altium

Build a 2-in-1 Continuity & AC Line Tester! | Circuit Explained ⚡ Accelerate Your Career in Electronics Design Altium Student Lab: www.altium.com/in/yt/electricdhamaka #Altium #AltiumStudentLab Description: Welcome back to Electric Dhamaka! ⚡ Today, we are looking at a super useful, multi-purpose electronics project: the Continuity Cum Line Tester. Whether you need to troubleshoot a broken wire or safely detect live AC voltage, this single, compact circuit has you covered. It is a fantastic project for school, college, or your own DIY electronics workbench. Notice the handy color-coding in the circuit diagram to make building it even easier: 🟢 Green Symbols: NPN Transistors (BC548, BC547) 🔴 Red Symbols: PNP Transistors (BC557) 🛠️ How It Works: 1. The Line Tester (Green LED Side) This section detects live AC voltage safely. The BC548 transistor on the far left has its base deliberately left open ("base not used"). This allows it to act like a highly sensitive antenna that picks up the electromagnetic field radiating from live AC mains wires. When it detects an AC field through the Testing Pin, that tiny signal is amplified by the BC557 and BC547 transistors in a high-gain cascade, causing the Green LED to glow! 2. The Continuity Tester (Red LED Side) This side checks if a wire or component has a continuous, unbroken path. When you connect an object between the "Testing Pin" and the bottom "Touch Point," it allows a tiny amount of current to flow to the base of the right-side BC547 (NPN) transistor. That transistor turns on, which pulls the base of the final BC557 (PNP) transistor low, turning it on and lighting up the Red LED to confirm a good connection. 🔌 Components Required: Transistors: 3x BC547 (NPN) 2x BC557 (PNP) Resistors: 2x 10MΩ (Megaohm) 1x 220KΩ (Kiloohm) LEDs: 1x Green LED (for Line Testing) 1x Red LED (for Continuity Testing) Power Supply: 3V to 4.5V DC Battery Miscellaneous: * Testing Pin (Probe) Touch Point (Metal contact) Connecting wires & breadboard/PCB If you found this circuit helpful, please hit that LIKE button and SUBSCRIBE to Electric Dhamaka for more awesome DIY electronics projects and circuit explanations. Have you built this yet? Drop a comment below and let me know how it works for you! 👇 #Electronics #DIYProject #ElectricDhamaka #CircuitDiagram #TransistorCircuit #STEM #ContinuityTester #LineTester #ElectronicsHobbyist