I needed a 0-10V variable power supply capable of driving 100mA and there are very few other options besides expensive and hard to get lab equipment or rolling your own. These boards fit the bill and saved me a lot of time and expense.
I needed a total of 8 outputs, so ended up adding bodge wires for the extra chip select pins on the top 3 boards.
I also hacked one up for single ended operation. This gives me full 12-bits resolution across a 0-12V range. Instructions are here if anyone else needs this...
I was a bit confused at the operation until they clarified. You provide the desired voltage to switch on Vcc (e.g., 5 volt, 12 volt, ...) and the ground. These wires should be sufficient to carry the desired load current.
You provide a switch signal (e.g., 5 volt or 3.3 volt) to the sw signal to close the switch and gnd to open the switch. The LED turns on when switch is closed.
When 5 volt or 3.3 volt are provided, the neg output connection is shorted to ground thereby completing the output circuit.
I wondered what would happen if I applied 110 volt ac. I found that a 150 watt bulb dimmed. No damage though so this product is robust.