Power bank from old phone batteries
Power bank from old phone batteries
Posts
🔴 Red LED on 220V AC – How It Works and How to Do It Safely
🔴 Red LED on 220V AC – How It Works and How to Do It Safely Red LEDs (Light Emitting Diodes) are common, cheap, and bright—but directly connecting them to 220V AC can burn them instantly . However, with a simple protective circuit, you can safely light a red LED on 220V AC mains . Let’s explore how! ⚠️ Safety First! Never connect an LED directly to 220V AC without a proper current-limiting and voltage-dropping circuit. LEDs work on 2V–3V DC , while 220V AC is lethal. Use isolation while testing. 🔍 Components Required Component Value Purpose Red LED 5mm / 3mm Emits red light Capacitor (non-polar) 0.22µF / 400V Drops voltage (X-rated) Resistor 470Ω – 1kΩ Limits inrush current Diode (1N4007) 1 Rectifies AC cycle Bleeder Resistor 470kΩ – 1MΩ Discharges capacitor safely ⚙️ Circuit Diagram Overview less Copy Edit AC 220 V │ [C1] --- [R1] --- |>| --- + --- [LED] 0.22 uF 470 Ω 1 N4007 | | [BLE...