Features
Build a Miniature Color Organ
by Ron Newton
Create your own light show with colored LEDs that flash to the beat of your favorite music. Page 38

Build the 3D LED Matrix Cube
by John Iovine
Construct this eye-catching 4 x 4 x 4 monochromatic LED matrix that will give you hours of enjoyment and entertainment. Page 44

Open Communication
by Louis E. Frenzel
Bluetooth: Forgotten Wireless Technology or Just Taken for Granted? Page 62

Projects
Build an LED Analog Clock
Electronic Gadgets
by David Welburn
This unique clock project is a great mix of analog and digital electronics all in one. Page 28

Build the Infinity Portal
Electronic Gadgets
Construct this updated version of an infinity mirror using LEDs controlled by an Arduino. Page 34

Columns
Techknowledgey
by Jeff Eckert
TechKnowledgey 2011
Read about fractals that could cure blindness, the first quantum computer that has been sold, the other lighting alternative, plus some other interesting stuff. Page 10

PICAXE Primer
by Ron Hackett
PICAXE Primer
Using EEPROMs to Store and Retrieve Data. Page 14

Q&A
by Russell Kincaid
Q & A
Zeners at high frequency, an LED flasher circuit, and a refrigerator door alarm are covered this month. Page 22

The Design Cycle
by Fred Eady
The Design Cycle
Give Your Bits Some AIR. Page 54

Smiley’s Workshop
by Joe Pardue
Smileys Workshop: An AVR C Programming Series (Part 37)
avrtoolbox USART. Page 67

Fundamentals For Beginners
Build a DC to DC Power Supply
Just getting started in electronics? Try these simple demos to illustrate electronics principles and how components function in actual circuits! Page 76