Here’s a 2 liter plastic soda bottle leyden jar, can be shocking, even dangerous, don’t do this unless you know what you’re doing (here’s what they’re all about, Wikipedia)… The Leyden jar is an early device for storing electric charge invented in 1745 by Pieter van Musschenbroek (1700-1748). It was the first capacitor. Leyden jars […]
Jdege writes – The problem? A dog that gets way too excited when the doorbell rings. The solution? Ring the doorbell at random times when no one is there, and nobody answers it, so as to counter-condition the dog – to break the association that a ringing doorbell equals excitement. The technology? A Parallax 418 […]
Here are some useful tips on salvaging components from old electronics. I especially like the idea of using the bottoms of water bottles to create clear, stackable parts bins. Tool Tip: How to Salvage PCB Parts – Link
An analog bell with a simple hardware interface controlled via the Processing language. Build a real bell-striking clock for your PC and a fire extinguisher-striking clock – Link
Here’s a how-to on using an inkjet printer to assist in the creation of flexible conductive circuits. The printer is only used to transfer the circuit image onto the conductive fabric. You still have to paint the resist on by hand. Conductive Fabric: Make Flexible Circuits Using An Inkjet Printer. – Link
This one made me smile. Back in the late ’70s, a friend of mine, a machinist, gave me a sheet metal version of a back issue box template as a gift, the same basic one used here. I went nuts, cutting and folding dozens (and dozens) of boxes for my large magazine, small press, and […]
All out of TO-220’s? Thinking maybe you can eke enough performance out of a smaller transistor? Want to squeeze a bit more current through those inexpensive TO-92 package transistors? Then add a small metal heatsink. I made this for a PWM DC motor driver, as some 2N2222 bi-polar transistors were handy. Of course, we should […]
