Projects & Features
28 Build a Stereo
Tired of being blasted off your seat by
excessive audio volume when you switch
television channels or when the
commercials come on? To mitigate such
unnerving changes in program audio,
a popular automatic volume controller
from the vacuum tube era was updated
to today's technology. This circuit is also
useful in home recording.
■ By Dev Gualtieri
34 Build the Garage Door Closer
Leave your garage door open?
No problem! This handy device will close it
automatically for you. (Plus, you don’t even
have to remember to replace batteries in
■ By Brian Beard
38 Build a USB Volume and
Mute Controller for Your PC
Now you can do things like listen to music
on your laptop with the lid closed because
volume control is now accessible externally.
■ By Richard Dzioba
44 The Radio Whisperer
Learn about the methodology behind WSPR
(weak signal propagation reporter) software.
■ By George Steber
10 TechKnowledgey 2012
Events, Advances, and News
Find out how to upgrade your
iPad 2 with a keyboard case,
take 4-D photos, and if Bing is
losing big (it is), along with
other pretty interesting stuff.
14 Near Space
Global Positioning System Simulator, Ver 2.0.
22 Q & A
Reader Questions Answered Here
Questions on flickering lamp circuits, water softeners,
and USB testers are just some of the things talked
about this time.
52 Smiley’s Workshop
Programming • Hardware • Projects
Breadboard LCD Navigator Part 1: the LCD.
58 The Spin Zone
Adventures in Propeller Programming
68 The Design Cycle
Advanced Techniques for Design Engineers
MPLAB’s X Factor.
26 NEW PRODUCTS
64 NV WEBSTORE
78 TECH FORUM
81 AD INDEX
FUNdamentals For Beginners
50 Build a Variable Timer
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