When we have blogged before about folks laser-cutting old records to make stuff, readers have been quick to point out that laser-cutting vinyl is dangerous because it releases chlorine gas which, in turn, presents two hazards: A) you donโt want to breathe it (and probably shouldnโt just vent it into the atmosphere), and B) it will corrode the metal parts of your equipment.
Like making circuit boards, but don’t like all of the toxic chemicals that you have to use to do it? You might want to take a look at Stephen Hobley’s directions, then. He’s claiming to be able to etch boards using only diluted hydrogen peroxide, vinegar, and a bit of table salt. He’s got an […]
Most of our readers will know that one of the most common types of residential smoke detectors actually contains radioactive materialโspecifically, an isotope of americiumโwhich is used to ionize air molecules in the detector itself. In this video, the always-engaging Bill Hammack, aka Engineer Guy, explains both the operation of the ionizing detector and, most interestingly for me, also the circuit in which it operates, and the MOSFET which is the other critical component in that circuit (and is, incidentally, the namesake of Phil Torroneโs cat). Characteristic Bill quote: โTo me, this is engineering at its best: Simple, reliable, and inexpensive. And saving countless lives.โ Thanks, Bill, as always!
Great looking results from the very accessible process of toner transfer galvanic etching, by Rab. [via Hacked Gadgets]
The hard way, of course, is to splice in the gene that codes for green fluorescent protein, as in the case of, say that GFP bunny that made the rounds a few years back. Thatโs a bit of a project, really.
This quickie version, from everybodyโs favorite anonymous, Jigsaw-voiced YouTube chemhacker NurdRage, amounts to extracting the fluorescent dye from highlighters into water and, you know, sticking the cut stems down in there for while. To use scientific terms.
Cool enough. And though Iโm a big NurdRage fan, I have to protest the use of โglow in the darkโ to describe whatโs happening here. In truth, these flowers are fluorescent, because they appear to glow in the dark under UV light. But whatโs really happening is near-instantaneous re-radiation, of absorbed UV photons, in the visible band. True GITD materialsโlike those stick-on stars on your bedroom ceilingโwork by the entirely different process of phosphorescence. And although it may never be possible to make a living flower truly phosphorescent, there was recently a very interesting advance in the field of phosphorescent materials. [via Neatorama]
Continuing his wonderful series of videos on the unappreciated wonders of engineering that surround us hereโs Engineer Guy on the truly amazing process required to produce a common incandescent light-bulb filament. As always, Bill displays a fantastic ability to produce short, engaging, entertaining video segments that will appeal to and educate both the totally uninitiated and those who, like myself, are foolish enough to think we know a thing or two. [Thanks, Bill!]
The metal gallium has a low melting point (29.78 ยฐC, according to the material safety data sheet), so a spoon made of it will melt when used to stir a hot beverage. [via Gizmodo]
