LED Lights for 120VAC mains

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LED current is derived directly from the mains via a diode-capacitor circuit.

Reverse engineered circuit diagram of an LED night light made by a north american manufacturer. Remarkably it only draws 100mW and has some surge voltage immunity. A clear plastic light pipe is used to diffuse the light from the LED into the room.

Circuit Diagram aka Schematic reverse engineered from circuit board

Reverse engineered circuit diagram of another commercial LED night light. This one has a photocell to turn the light off during the day. It also uses light pipe techniques to make the little LED look like a larger lamp. The photocell circuit has hysterisys so that for all intensive purposes the light is always either fully on or fully off.

Circuit Diagram aka Schematic reverse engineered from circuit board

Reverse engineered circuit diagram of a commercial LED christmas bulb for outdoor chains. The circuit board, which sits inside the plastic lamp just above the screw base, has a spot for a zener and capacitor which are not installed.

Circuit Diagram aka Schematic reverse engineered from circuit board

Reverse engineered circuit diagram of a commercial LED fiber optic night light. The circuit board and LED's are mounted inside a plastic case with ventilation holes. The light is particularly bright.

Circuit Diagram aka Schematic reverse engineered from circuit board

Safety, accuracy and completeness of information provided herein is not guaranteed,
so be inspired by it but do not use it as a basis for experimentation or other actions.

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