If all you want to do is provide power for a laptop or phone then the DP832 or DP832A is way over spec; it's a triple output supply and costs $450 or more (street price).
You might consider something simpler like a 30V, 5A single linear supply (you need at least 5A as many laptop PSUs these days are over 100W (power is volts x amps so 20V x 5A is 100W).
You can set up a lead that plugs into your laptop with bare wires at the other end that you connect to the PSU but it would be better to make up a cable that has banana plugs on it to plug into the PSU; don't plug it in backwards or you will likely mess up the laptop! Some laptops have special power supplies that 'talk' over the DC supply line so you won't just be able to connect to a bench PSU and have that work. And no, even fancy bench PSUs like the DP832A don't do that stuff.
Something as simple as
this $44 from eBay would be a sensible, basic, linear supply and for $100 you would have many to choose from. Don't buy a switched mode one, they are horribly noisy (electrically) on their outputs.