I have an old multi-coloured LED lighting system, but sadly I have lost the power adapter to it and there are absolutely no markings (exterior or interior) whatsoever, so I am trying to figure out the power requirements so I can breath some life back into it.
The internals of the control box is a 78L05 regulator, connected to an ATMEGA88 microcontroller which, through a series of small SMT components I cannot make out the markings of but have assumed to be a transistor and resistor, link 3 outputs to the connectors that go to the lights via 3 J189 FETs.
The output from the FETs link to the 6 connectors to the lights, all wired up in parallel. Each light is a stick of 54 LEDs, 18 on each channel (linked to each FET). I cannot make out the internal wiring of the sticks, but I can see that they are subdivided into 6 sets, denoted by resistors every 9 LEDs.
I have tried to determine the resistor values, but they appear to be consistent on their channel, one channel is 470 Ohms, another is 200 Ohms, and the third is 240 Ohms.
So, in a nutshell, 108 LEDs with 36 470 Ohm Resistors, 108 LEDs with 36 240 Ohm Resistors, and 108 LEDs with 36 200 Ohm Resistors. I think that each smaller set (3 LEDs) are connected in series, then those are grouped together in parallel, totaling 36 groups, but each stick might be entirely in series.