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January 2013

Nuts and Volts Magazine

Build Your Own Gravimeter And Measure Differences In the Earths Gravitational Field

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Projects

The Sirius Metronome for the Serious Musician

Build a metronome that sports a number of impressive features lacking on even more expensive commercial units.


Build an Inverting DC-DC Converter

Electronic Gadgets

Ever need negative voltage when all you can get is positive? This voltage mirror device will give you -V out when you put +V in, and works over a range of voltages without adjustment.


King Tut’s Pyramid Gravimeter

Nuts & Volts Special

Use this novel assembly to determine the gravity of most any situation.



Columns

TechKnowledgey
by Jeff Eckert
Events, Advances, and News (1.2013)
Some of this month’s tidbits include a supercomputer that hits 20 petaflops/s, the next-gen of the iMac family, and how to record your entire life effortlessly.

Smiley’s Workshop
by Joe Pardue
Smiley’s Workshop 54: The Arduino Proto Shield Alarm Clock — Part 1
Transferring the alarm clock components from the mini breadboard to the prototyping area on the proto shield, then writing some useful software. Part 54

Q&A
by Russell Kincaid
Reader Questions Answered Here
Questions about a voltage converter, a trigger LED from a distributor, and a bench top power supply are answered, plus a digital pressure gauge is revisited this time around.

The Design Cycle
by Fred Eady
LMX-ISM-242 State of Mind
While you were gone, I managed to get my hands on the official Lemos hardware.

The Spin Zone
by Jon McPhalen
New Life for an Old LCD
The displays we’re looking for specifically use the Philips PCD8544 matrix LCD driver/controller.

Near Space
by L. Paul Verhage
Using the Nearspace Simple Flight Computer
Last time, we covered building the NearSpace Simple-18 flight computer. Now, it's time to test and learn how to use it prior to its first near space launch.