电热毯是如何工作的？
电热毯是如何工作的？
电热毯内部有加热丝，通电后产生热量。温度可调节，让床铺在冬天保持温暖。
🔊💡 DIY Sound-Activated LED Bulb on 220V – Clap to Turn On!
🔊💡 DIY Sound-Activated LED Bulb on 220V – Clap to Turn On! Want your bulb to turn ON automatically with sound , like a clap or a snap? A sound sensor-based LED bulb on 220V can do exactly that! This project combines sound detection and AC lighting —great for automation, fun, and convenience. 🎯 What Is It? A sound-activated LED bulb lights up when it detects sound above a certain level (like a clap). It uses a microphone , amplifier, and a trigger circuit to switch a relay or triac , allowing 220V to flow to the LED bulb. 🔧 Required Components Component Description Electret Microphone Detects sound Transistor (BC547/548) Amplifies sound signal LM393 / Op-Amp / 555 Sound trigger stage Relay (5V or 12V) Controls 220V AC 220V LED Bulb Output load Power supply (5V/12V) To run the control circuit Diode 1N4007 x 4 Bridge rectifier Capacitors & Resistors Biasing and filtering Triac BT136 (optional) If not using relay Opto-isolator (optional) For safer AC switching ⚙️ H...
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