![Components](https://www.experimental-engineering.co.uk/wp-content/uploads/2016/08/2016-08-03_23-21-44_000203-scaled.jpg)
![Damaged Bulb](https://www.experimental-engineering.co.uk/wp-content/uploads/2016/08/2016-08-03_23-20-44_000199-300x225.jpg)
Here’s a modern LED bulb, that unfortunately decided to disassemble itself within a few minutes of being installed in a light fitting! The base plastic snapped off the main aluminium body at the screw posts!
![Input Rectifier](https://www.experimental-engineering.co.uk/wp-content/uploads/2016/08/2016-08-03_23-20-56_000200-300x225.jpg)
The PCB in the base holds nothing but the input components. Above is the bridge rectifier.
![Fusible Resistor](https://www.experimental-engineering.co.uk/wp-content/uploads/2016/08/2016-08-03_23-21-02_000201-300x225.jpg)
The other side of the PCB has a 10Ω fusible resistor, for protection.
![LED PCB](https://www.experimental-engineering.co.uk/wp-content/uploads/2016/08/2016-08-03_23-21-15_000202-300x225.jpg)
The LED PCB itself has the driver IC, which is a CYT3000A linear constant current IC, that runs direct from full-wave rectified mains. The single resistor sets the LED current, but there aren’t any smoothing capacitors on the DC rail, so this bulb would flicker a lot.