WEBVTT NOTE This file was exported by MacCaption version 7.0.06 to comply with the WebVTT specification dated March 27, 2017. 00:00:00.083 --> 00:00:03.170 align:center line:-1 position:50% size:54% Next, we're going to look at how you can connect multiple outputs 00:00:03.170 --> 00:00:05.714 align:center line:-1 position:50% size:48% to get more current or more voltage. 00:00:08.884 --> 00:00:10.802 align:center line:-1 position:50% size:67% One of the things you can do with power supplies, 00:00:10.802 --> 00:00:15.474 align:center line:-1 position:50% size:52% especially if you have multiple supplies or multiple channels on one supply, 00:00:15.474 --> 00:00:18.435 align:center line:-1 position:50% size:66% is you can actually stack those channels together. 00:00:18.435 --> 00:00:25.108 align:center line:-1 position:50% size:63% If I have two 10 V max outputs, I can combine them into a 20 V output. 00:00:25.108 --> 00:00:29.571 align:center line:-1 position:50% size:63% The most important thing, Daniel, is to have two power supplies that are identical 00:00:29.571 --> 00:00:33.659 align:center line:-1 position:50% size:36% when you're stacking them or putting them in series. 00:00:33.659 --> 00:00:37.579 align:center line:-1 position:50% size:53% That is a good example when you have a power supply with multiple outputs. 00:00:37.579 --> 00:00:40.582 align:center line:-1 position:50% size:42% It makes it a lot easier that the outputs are very similar 00:00:40.582 --> 00:00:48.548 align:center line:-1 position:50% size:62% and can be combined to make a larger voltage in your case of putting them in series. 00:00:48.548 --> 00:00:52.844 align:center line:-1 position:50% size:55% The other thing you need to watch out for is that power supplies do have a limit 00:00:52.844 --> 00:00:57.683 align:center line:-1 position:50% size:39% how far the negative terminal can be lifted above ground. 00:00:57.683 --> 00:01:02.062 align:center line:-1 position:50% size:60% The first power supply is pushing the voltage up on the second one, 00:01:02.062 --> 00:01:06.733 align:center line:-1 position:50% size:59% so they are away from ground, and we do need to be careful about limit. 00:01:06.733 --> 00:01:10.153 align:center line:-1 position:50% size:49% As long as those two things are met, similar power supplies, 00:01:10.153 --> 00:01:13.156 align:center line:-1 position:50% size:46% you're within the safety tolerances of the power supply, 00:01:13.156 --> 00:01:17.202 align:center line:-1 position:50% size:59% it's a great thing to do to get higher voltages. 00:01:17.202 --> 00:01:19.746 align:center line:-1 position:50% size:58% Some of our newer modern power supplies have it built in, 00:01:19.746 --> 00:01:22.749 align:center line:-1 position:50% size:49% so you just push a button, and it makes the connection for you. 00:01:22.749 --> 00:01:25.294 align:center line:-1 position:50% size:42% It'll automatically do that inside. 00:01:25.294 --> 00:01:28.463 align:center line:-1 position:50% size:59% To get more voltage, you put them in series. 00:01:28.463 --> 00:01:31.091 align:center line:-1 position:50% size:49% To get more current, you can actually put them in parallel. 00:01:31.091 --> 00:01:36.388 align:center line:-1 position:50% size:52% You keep the same max voltage output but then double drive the current. 00:01:36.388 --> 00:01:42.769 align:center line:-1 position:50% size:57% A little bit different when we're putting them into the parallel mode for higher current. 00:01:42.769 --> 00:01:46.398 align:center line:-1 position:50% size:69% What you want to do is you want to have one of the power supplies being the constant voltage source. 00:01:46.398 --> 00:01:48.650 align:center line:-1 position:50% size:56% It will be the only constant voltage source. 00:01:48.650 --> 00:01:52.779 align:center line:-1 position:50% size:60% What you'll do is you'll drop that limit on the second one, the current limit, 00:01:52.779 --> 00:01:56.074 align:center line:-1 position:50% size:38% to ensure that it stays in its constant current mode. 00:01:56.074 --> 00:01:59.953 align:center line:-1 position:50% size:45% That way, the two power supplies aren't fighting against each other, 00:01:59.953 --> 00:02:04.708 align:center line:-1 position:50% size:48% a little trick when you're putting them in parallel. 00:02:04.708 --> 00:02:08.795 align:center line:-1 position:50% size:51% Again, on modern power supplies, we have that capability built in, 00:02:08.795 --> 00:02:11.381 align:center line:-1 position:50% size:41% and it'll take care of that for you. 00:02:11.381 --> 00:02:14.760 align:center line:-1 position:50% size:62% If you have a new one, you don't have to worry about setting the settings just right, 00:02:14.760 --> 00:02:16.470 align:center line:-1 position:50% size:38% you just hit the right buttons. 00:02:16.470 --> 00:02:20.349 align:center line:-1 position:50% size:56% On the old ones, you had to be careful about being better about matching ratings 00:02:20.349 --> 00:02:23.060 align:center line:-1 position:50% size:38% and setting constant current versus constant voltage 00:02:23.060 --> 00:02:25.187 align:center line:-1 position:50% size:37% and a couple caveats there. 00:02:25.187 --> 00:02:28.273 align:center line:-1 position:50% size:44% There's also, in the course notes or in the description, 00:02:28.273 --> 00:02:32.319 align:center line:-1 position:50% size:51% there's going to be a download that talks to specifically how to do this 00:02:32.319 --> 00:02:34.821 align:center line:-1 position:50% size:68% and has some nice diagrams for making that work.