Dave explains the three main methods of Uninterruptible Power Supply design - Offline, Online, and Line Interactive. And then opens an APC 2200XL rack mount UPS to see how well it matches the classic block diagram theory. Will there be any surprises?

staff
staff:


Since we launched our first sponsored post on Tumblr Radar one year ago, we’ve been proud to see our partners bring their most creative work to Tumblr. Their posts have already earned more than 10 million likes and reblogs.

Today, we’ll start to bring sponsored posts to your Dashboard on the web. Just like in our mobile apps, these posts will simply blend in with the posts from the blogs you follow.
Now back to your regularly scheduled Dashboard!

staff:

Since we launched our first sponsored post on Tumblr Radar one year ago, we’ve been proud to see our partners bring their most creative work to Tumblr. Their posts have already earned more than 10 million likes and reblogs.

Today, we’ll start to bring sponsored posts to your Dashboard on the web. Just like in our mobile apps, these posts will simply blend in with the posts from the blogs you follow.

Now back to your regularly scheduled Dashboard!