The other day a friend asked me if I could mod one of those cheap chinese LED lamps they sell at the dollar store to use an AC adapter. So I did.
Taking it apart, as you'd expect the inside was horrible. Wires hanging onto each other with gobs of solder, switches in mid air with no support, stuff like that. Well, for $2 what can you expect.
What I found interesting was that the circuit itself is 3 LEDs in parallel, with resistors before and after:
(Can't remember the resistor values, and I don't have any desire to take the screws off again and look :) )
Why the resistors before and after, and not simply in one place? Is there any special reason, or did they just have two types of resistors stocked up they needed to get rid of?