Memory hack for new 2-wire LED Christmas fairy light controller.

The newer LED controllers for LED Christmas lights use alternating polarity to drive two channels of LED lights. This means it's not possible to bypass the controller internally to stop the lights flashing. When you realise why these controllers don't store their last setting it is quite annoying. It's merely the omission of a single cheap memory chip from the controller, which does have a space for it. On many sets the memory function is in place, so this is clearly an optional "value added feature". Putting the chip in does require quite destructive opening of the case and the soldering in of a tiny surface mount memory chip. This makes it a project best suited to the electronically inclined. The chip required is a 24C02B although I used a 24C02N. It's a very common low level EEPROM memory chip.