The $5 Cracker Box Amp
Build this workable little practice amp in about an hour.
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Hook-up wire
Popsicle Stick Switch
A momentary contact Single Pole Single Throw (S.P.S.T.)
switch that is based on a Popsicle Stick. It is easy to build and the builder learns how a switch works.
Dodecahedron Speaker for Desktop 3D Printers
At normal listening distances, an array of twelve speakers arranged on the faces of a dodecahedron is a very good approximation of a point sound source, and the sound waves it produces are very close to perfectly spherical. A dodecahedron speaker can be a useful tool in acoustics research, and is definitely a fun toy […]
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Star Trails
Star trails are the paths left by stars as seen from the earth. As the earth spins, the stars appear to move and circle in the sky. To capture the star trails you need a camera, a tripod and an automated trigger for your camera. The Arduino, a relay and the camera’s remote control will […]
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BEAM Solar Chariots
BEAM robot building techniques allow you to build fun and simple little robots with lots of room for stylizing. BEAM robots can move anywhere from a fraction of an inch to a couple of feet, depending on how big their capacitors are. You can also use batteries. For these two projects, we’ll use what’s known […]
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Solar Buzzing Beetle
In these instructions, I teach you how to make a vibrating little cute buzzing humming beetle robot. This is great for beginners because of the simple circuit and low parts cost.
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Pin-Hole Planetarium
Using a few electronic components and some common household materials you can create a simple planetarium for your home.
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