 This is an interesting look into old school rectifiers. Mercury Arc Rectifier have now been replaced with solid state bridge rectifiers which are inexpensive and reliable. I wonder how many of these Mercury Arc Rectifiers are still in operation, it seems that lots of this old stuff will be kept in use until it fails. “Operation of the rectifier relies on an electrical arc discharge between electrodes in
Hobby King had a great plan to get people building big lifting copters. They call it the Beer Lift but water is used as a substitute although I am sure an equal weight of beer is weighting behind the scenes for enjoying after the competition. The last video isn’t a heavy lift but make sure you watch what happens at 2:20, that is some good flying!
 Who would have thought that we would see a $200 printer this early! Looks like the MakiBOX by Jonathan Buford is currently the cheapest 3D printer around (please correct me in the comments if there is something cheaper). Now that Makerbot has gone through some drastic changes and is no longer open source are we going to see lots of low cost entry level machines fill the void?
If you look at a modern construction site these days you don’t generally see very many craftsmen carving intricate details into the buildings, what you see are pre-manufactured sections being assembled. With the revolution that is happening with 3D printing I think it is just a matter of time when many custom details are once again built onsite. Not by skilled craftsmen but by precision universal machines. I can
Ever want to see what is inside a huge High Voltage Transformer? The Geek Group got one donated and took it apart for everyone to have a peek. The transformer is an old medical XRAY transformer, there is a huge safety disconnect contactor under the top cover and the entire case is filled with mineral oil for high voltage isolation. They spread it out over 3 videos and some
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Stamps.com seems to be promoting their service in all corners of the web these days. Their scales are a big part of how their service works to allow you to print your own stamps at home. Only thing is the fully functional scale they provide is only good if it is connected to a computer since there is no display on it (looks like the new scales do have
