Most of us toss away our car and boat batteries when they no longer start our vehicle in the winter. Most of these batteries are now advertised as maintenance free lead acid, even though the electrolyte often still dries out. Youtube user Redicety12 shows us how you can bring them back to life by cracking the tops off the battery, dumping out all of the old electrolyte out, rinsing
 Dimitri, Frank, Kevin and Robin from Eectronique have sent in some details of a project that they have been working on. They had an old early 90’s LED matrix sign and wanted to make it work with a Raspberry Pi. The circuit layout is what you would expect from that era. Read More: Old Display Reverse Engineered to work with a Raspberry Pi Google Translated version. “I was
Rich Olson shows us how he was able to laser etch the trace pattern onto some copper clad PCB using his laser cutter so that he could later chemical etch the unwanted copper away. I have tried something similar and was not successful since I was not able to line up the front and back of the PCB well enough for pads and vias to work. Rich uses a
You can purchase some macro lenses for your phone camera but with a bit of work and a spare LED lens you can make your own. Only thing to make sure is that the LED lens is high quality so that there aren’t any bubbles or other imperfections in it which would cause image distortion. ASCAS shows us how it is done in his LED Lens converted to Macro
With this hack you will be able to Hack a Sigma Lens to operate with Canon Cameras. The lens being demonstrated is an older lens and the camera that it is being adapted for is a DSLR. The issue is that the signals from the DSLR for adjusting the aperture of the lens are not recognized by the lens. By adding a small microcontroller in the mix, the camera
 Check out this cool 3D Printed Stepper Motor that Christopher Hawkins made. You can see in the video that it can move quite quickly and not loose any steps. This design would be idea to teach how stepper motors work. Via: Hack a Day “This is a programmable stepper motor and driver that I made out of some nails, magnet wire, neodymium magnets, a digispark microcontroller, and a 3D
You may have seen these bubble lamps on some old ornamental items such as jukeboxes. It uses methylene chloride which boils at a low temperature. The effect shows a bubble that forms at the bottom next to the heat source and as it rises the bubble gets smaller and smaller until it simply disappears.
