This is LM317 Small Power Supply. The input voltage to the LM317 must be at least 1.5v greater than the output voltage. The output is adjustable between 1.25 and 13.5 Volts with a maximum current limit of 1.5 Amps A heat sink will be required for most applications however. On my picture you can see the heat sink. Here is a schematic of LM317 supply.