Category Archives: Cool video

Cool video: A playable record made from a tortilla

An actual laser cut tortilla that will play the Mexican Hat Dance when played on a turntable. (Photo credit: Instructables user [UpgradeTech]

Did you know you could make a record from a tortilla and play it on a turntable?  Why would you want to do this, you may ask?  Because… laser cutter!

Last night while cruising Instructables I found “Make a Working Playable Tortilla Record with a Laser Cutter” by Instructables user [UpgradeTech].   The Instructible describes all of the steps, from choosing the perfect tortilla to converting the music files into the laser cutter files.  I’ll spare you all of this–you can read it if you want–but I will play the video.  Because it’s cool.

Published from DFW, Texas

Projects: Make your own Plasma-Arc Audio Speaker

Living in North Texas. I have been seeing plenty of electrical arcs lately, due to the unprecedented storms we have been having through the month of May.  A few of these arcs have been destructive — one of our sound system amps at our church started billowing out acrid smoke about the same time that we had a very close lightning strike, another local church took a direct hit a few weeks ago, and just the other day my friend Roger KE5YTA lost a radio power supply due to a very close strike.  Another friend, Don AE5DW in Louisiana took a direct strike two weeks ago and basically lost everything electronic in his house.

555 Timer IC (Wikimedia Commons photo)

Aside from the sights and smells that lightning and electrical arcs can create, they usually make a loud and obnoxious noise.  That’s why I was impressed when I saw the DIY Plasma Speaker on Instructables today.  Instructables member [tanner_tech] used a classic 555 Timer IC and a flyback transformer, high-voltage mosfet, and a fast diode from an old TV to make music.  Literally, you plug in any sound source and it creates (surprisingly) high quality audio from about a one inch high voltage electrical arc.  Visit the Instructable here and watch his YouTube video below — if you want to skip the technical stuff the music starts at about 3:10.  Then you just might want to go back and watch the technical stuff.

Published from DFW, Texas

Crosstown Traffic: Collin Cunningham at Adafruit demonstrates PC Board milling

Collin Cunningham at Adafruit put up another Collin’s Lab video yesterday on the Adafruit Blog, this time demonstrating an alternate method of making printed circuit boards using a small CNC mill instead of etching.  If you don’t want to go to that site I embedded the video below.

No, the mill ain’t cheap.  Adafruit sells it for just under $2200.  But it would look great next to a 3D Printer… and as much as I want a PolyPrinter ($2400), I can’t justify that either.

Collin used to publish these videos and other posts over on the Make: magazine website but defected to Adafruit a few years ago.


Published from DFW, Texas


Cool video: Worlds simplest “electric train” built with an AA battery, magnets, and copper wire

Saw this and thought it was cool.  The theory behind it is interesting too.

Basically you are using the voltage in the battery to create a magnetic field in the section of the coil of wire that the battery is in.  The magnets on either end serve two functions – they conduct the battery voltage to the coil, and they serve as the opposing magnetic force that the moving magnetic field pushes against.


(Published from Chicago, IL)