Inspired by a design he saw on the EEVblog, [George Graves] put together this constant current dummy load. You might need on of these if you’re testing power supplies or batteries. They pull a constant current regardless of the voltage of the supply. [George's] version extends the range of the original a little bit by running the op-amp … Read the rest
Constant current dummy load
May 15, 2012 By 13 Comments
Universal 20 channel project controller from a Ps2 controller
May 15, 2012 By 15 Comments
So you’ve got a really cool project that requires a wireless controller and a ton of different channels. What are you going to do? Are you going to go pick up an expensive RC controller? Nah, you’re going to build your own. This project makes a generic 20 channel controller for your projects by stuffing an SMDuino and an XBee … Read the rest
Controlling robots with a TRS-80
May 15, 2012 By 12 Comments
[DJ Sures], mastermind behind the EZ-B Bluetooth Robot controller, sent in a really interesting build where he controls a robot with a 1983 TRS-80 computer.
The robot in question is [DJ Sures]‘ adorable WALL-E we’ve seen before. WALL-E is controlled through a Bluetooth connection to a desktop PC with the EZ-Builder hardware and software package.
To get the Trash-80 … Read the rest
Floating sensor networks
May 15, 2012 By 10 Comments
These cool looking little bots are part of a fleet of floating water sensors built by The Lagrangian Sensor Systems Laboratory (LSSL) at UC Berkeley, the Lawrence Berkeley National Laboratories (LBNL) and the California Department of Water Resources.
In an emergency such as a levee break, flood, or spill, they can be deployed to gather information in a way that … Read the rest
Building a 4-bit TTL computer
May 15, 2012 By 5 Comments
When [GG] was 12 years old, he was introduced to BugBooks, the wonderful ‘introduction to digital design’ books from the early 1970s. It has always been a dream of [GG] to build the TTL computer featured in the BugBooks, and now that he has the necessary time and money available to him, the Apollo181 has become a reality.
[GG]‘s … Read the rest
Building a sound reactive EL panel and learning something in the process
May 15, 2012 By 7 Comments
We’ve seen a lot of builds using electroluminescent wire, usually in the realm of costumes and props. Unfortunately, most electrical engineers don’t deal with blinking and dimming EL wire and panels and any tinkerer trying to control electroluminescence doesn’t have a lot of resources on how to control EL stuff. [ch00f] wanted to fill this knowledge gap, so he build … Read the rest
[Engineerguy] explains how a CCD works
May 15, 2012 By 11 Comments
[Bill] is back with another fantastic video explaining a piece of intriguing hardware. This time, he’s explaining how a CCD works. For many of us, these things are part of our daily life, but aside from the fact that they capture an image, we don’t put much thought into them. [Bill] breaks things down in a way that we really … Read the rest
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