Detecting Sounds With The Sonic Sensor
This amp can be driven by a CD or MP3 player, and can drive a good high fidelity headset of about 32 ohms, and as high as 600 ohms and beyond. Plus, it’s a forgiving circuit for beginners.
Put your appliances under sonic control with this super souped-up version of a “clapper.”
Constructing an alarm system complete with a keypad interface is cheap and simple with Texas Instruments’ MPSP430 microprocessor and their easy-to-use Flash programmer and debugging tool.
TechKnowledgey
by Jeff Eckert
Events, Advances, and News (9.2013)
Harpooning your brain, free secure browsing, virtual money, and high-end ear buds are some of the titillating topics covered.
Near Space
by L. Paul Verhage
The 2013 Great Plains Super Launch
This year’s conference included topics such as near space STEM, designing and flying photometers, long-duration balloon flights and telemetry modes, and vacuum cannons.
Q&A
by Russell Kincaid
Reader Questions Answered Here
ESD instrument circuits, more about making sparks, VFO design, and MailBag round out this month’s topics.
The Spin Zone
by Jon McPhalen
Full Color With One Wire
LED manufacturers are creating some pretty cool products these days, and with just a little bit of programming, you can have a lot of fun with them.
The Design Cycle
by Fred Eady
Home Automation Telegesis Style
Absolutely zero ZigBee technical knowledge (or a third mortgage) is needed to put the Telegesis home automation radios to work.
Smiley’s Workshop
by Joe Pardue
Smiley’s Workshop 62: Arduino Handheld Prototyper — Part 3
Use the Arduino handheld prototyper to design a fresh air controller for your castle, or wherever you call home. Part 62-3
