Connect 3V LED Directly With 220V AC Supply - Using Resistor

L1: Turning on an LED - Physical Computing

LDR and LED Circuit Design - The Engineering Mindset

How to select Resistor Value for LED with simple calculation, 5v,12v,220v, Glow LED, Electronics pro

Some 230V questions - General Electronics - Arduino Forum

How to Run DC 12V LED Bulb or MCPCB LED lights on 220Vac

How to Connect 3v LED Light to 220v AC, 3v LED Directly with 220v AC

Led lights If you attach a 3v LED to a 9v battery, it will explode and/or burn. I'm assuming that I can just put 3 or more of these lights in sequence

Which Resistor Should I Use with my LED? – Kitronik Ltd

PRT-00114: Here is a very simple breadboard power supply kit that takes power from a DC wall wart and outputs a selectable 5V or 3.3V regulated voltage. The .1 headers are mounted on the bottom of the PCB for simple insertion into a breadboard. Pins labeled VCC and GND plug directly into the power lines. The lone pair of pins have no electrical connection but help support the PCB. There are two pins available within the barrel jack footprint.

SparkFun PRT00114 Breadboard Power Supply 5V/3.3V

How to Run DC 12V LED Bulb or MCPCB LED lights on 220Vac

What is the best way to supply a circuit with 3.3v and 5v simultaneously? I've found a couple of power modules that will take mains 240v and convert it to 5v but