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Makes a great solar charge regulator. 
This regulator can be used for solar powered battery charging. Just connect your solar panel to the input, then adjust the output voltage to 13.7 volts. Now you can charge a 12 volt Sealed lead-acid battery without fear of over charging.
These buck regulators have a neat feature - they put out more current than is drawn at the input!
DCC-3 and PM-233
With these 2 items, a wall wart, and a small utility box, you can easily build a variable voltage supply which can replace all those batteries in portable radios, etc. Also nice to be able to read both voltage and current without fumbling for test equipment.
The LM2596 is NOT the real thing! 
Bought two and discovered that the LM2596 device is not a LM2596 at all but some sort of a chinese counterfeit device. The switching freq at the catch diode is ~50Khz and not the 150KHz as specified in the National data sheet.
Yes, the board nominally works, but I have no confidence in the actual ratings of the regulator.
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