Step 11Buy a power supply（买一个电源）
If you don't have the parts necessary to build a 5V PSU, you can buy one.
如果你没有一个搭建5V电源的必要元件，你可以买一个。
eBay is a great place to buy these things.
eBay是买这些东西的好地方。
Search for "5v power supply" and limit the search to "Business & Industrial", and you'll get a lot of suitable power supplies. About 15 bucks will get you a nice PSU.
搜索“5V电源”，并限制搜索范围“商业与工业”，然后就能搜到很多合适的电源。差不多15美元就能买到一个不错的电源。
Step 12Build a power supply（搭建一个电源）
A couple of years before we built the LED cube, we made our self a nice little lab power supply from an old external SCSI drive. This is what we have been using to power the LED cube.
在我们搭建这个光立方的几年前，我们从一个旧的小型计算机系统驱动外部做了一个属于我们的漂亮的小实验室电源。
PC power supplies are nice, because they have regulated 12V and 5V rails with high Ampere ratings.
PC电源很不错，因为它们有12V到5V的调节范围以及较高的输出电流。
You can use either a regular AT or ATX power supply or and old external hard drive enclosure.
你可以使用普通的AT或者ATX电源或旧的外接硬盘那里获得。
If you want to use an ATX power supply, you have to connect the green wire on the motherboard connector to ground (black). This will power it up.
如果你想使用ATX电源，你必须将主板连接器上的绿线接地（黑）。这将启动该电源。
External hard drive enclosures are especially nice to use as power supplies. They already have a convenient enclosure. The only thing you have to do is to add external power terminals.
外接硬盘用做电源时非常合适。它们已经有个方便的外壳。你唯一要做的就是增加外部电源端子。
Power supplies have a lot of wires, but the easiest place to get the power you need is through a molex connector. That is the kind of plug you find on hard drives (before the age of S-ATA).
电源线有很多，但是使用molex公司的接插件是获得所需电源的最简单的方法。你可以在硬盘上看到这种接插件（在S-ATA之前的年代）。
Black is GND Yellow is +12V Red is +5V
黑色线是接地，黄色是+12V，红色是+5V。
Here is an image of our lab PSU. We have 12V output, 5V output with an ampere meter and 5V output without an ampere meter. We use the second 5V output to power an 80mm PC fan to suck or blow fumes away when we solder.
这是我们实验室电源的图片。有12V的输出，5V输出带有一个安培表，5V输出没有带安培表。当焊接时，我们用了第二个5V输出为80mm电脑风扇或者驱散烟气提供电源。
We won't get into any more details of how to make a power supply here. I'm sure you can find another instructable on how to do that.
在这里我们就不再深度扩展如何搭建一个电源的细节。我们相信你可以在instructable上找到其他合适的方法来制作。
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