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Given eBay's shocking reputation for facilitating the import and sale of extremely dangerous goods, it's a pleasant surprise to find an import that seems to be compliant with safety standards.
Note that due to the unregulated nature of eBay there is no guarantee that an identical looking listing would supply the same product.
The fact this unit has memory for the last setting means it might be a useful replacement for existing favourite strings of lights that also use the two wire 31V system.
Quite a tricky one to reverse engineer due to the use of an unusual switcher chip configuration on the primary side. The secondary side is very minimalist due to the use of an ASIC (Application Specific Integrated Circuit) that deals with all the lighting sequences, driving the LEDs with an integrated H-bridge and also storing the current selection to non volatile memory.
This unit puts out around 30V of alternating polarity. The LED string is wired as ten parallel circuits of thirty LEDs , all wired in a series string to give a combined voltage of about 30V.
Alternate LEDs in each parallel section are wired with opposite polarity to allow simple 2-channel flashing sequences. Static mode is actually rapid switching between the two channels.
I swapped out the sense resistor to see how it affected the power.
2.67 ohms (original) total unit power 4.5W (113mA LED current)
3.3 ohms total unit power 3.8W (100mA LED current)
3.9 ohms total unit power 3.6W (96mA LED current)
4.7 ohms total unit power 3.1W (73mA LED current)
5.1 ohms total unit power 2.2W but unstable with notable intermittent shimmer.
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