A: The #AS-2 accepts AC or DC power (5V- 12V), 100mA Max. This circuit is designed to operate under any straight DC or AC current provided the voltage doesn’t exceed 12v, 100mA. If you are using a DC power pack transformer we strongly recommend using the fixed AC output terminals.
A: Obstruction features can be put to work by soldering the wire leads to the round pads labeled "V+" and "GND". Make sure to use a 1k resistor when activating this feature.