22 Build a Customizable Musical
When my wife and I moved into our current home a few
years back, it didn’t have a doorbell. We live on a quiet
cul-de-sac, so it really wasn’t a problem as we had few
callers. After a while, I installed a wireless doorbell that
lasted about three years. Recently, after writing the series
of articles on “A Digital Analog – When a PIC Can Replace a
555,” I decided to make one using a PIC.
■ by Larry Cicchinelli
26 Build the MIDI Replay Stomp
The MIDI Replay Stomp Box is both a MIDI configuration
tool for applying a song’s keyboard settings, plus a four-track recorder providing accompaniment for songs. Other
features include foot-switch control, looping, transpose,
keyboard splits and layers, a metronome, plus syncing
data with its own PC desktop app and writing to standard
■ by Jeremy Leach
40 Super Simple Projects for
Learning Soldering and More
I’ve had a couple fun circuit ideas in the back of my head
for years and started playing with them, changing things
and finally formalizing them. They’re simple and are a good
exercise in soldering and circuit basics.
■ by Phillip Karras
46 Ready Player 2: CC3200 Wi-Fi &
IoT MCU — Part 1
The February 2018 issue article “Build the Io T Sump Pump
(or Pretty Much Anything Io T)” generated curiosity about
some of the tools utilized to create the device. It’s time to
“ready Player 2” and penetrate deeper into the utilization
of some of the software and hardware features that come
with CC3200 Launchpad and Code Composer Studio (CCS).
■ by Patricia & Mirza Kolakovic
54 Can You Trust Your Voltmeter?
Sometimes I wonder which of my portable digital
voltmeters I can trust — the B&K, Fluke, or Amprobe.
Usually, they’re pretty close but it bugs me not knowing
whether they are right on the nose.
■ by David Goodsell
60 Pawlicki’s Posers
This is the first in a series of questions to encourage
readers to think about electricity and electronics in ways
that, perhaps, they had not before. My intent is to improve
understanding how electricity behaves and how it can be
made to do what we want.
POSER #1: How does electricity know to light the bulb
while leaving everything else dark?
■ by John Pawlicki K8AG
62 Meet the Microbitx: A Simple
to Build, Yet Challenging All-Band
Rarely has there been as much interest in a high frequency
radio as that shown to the Microbitx created by Ashhar
Farhan. Low-power enthusiasts have rushed to place
their order for this exciting (and a bit challenging) new
■ by Steve Jackson
69 FPGAs for the Hobbyist: NTSC
If you have read my previous Nuts & Volts articles in the
FPGAs for the Hobbyist series, you already know that I’m a
big fan of Embedded Micro’s Mojo V3 FPGA Development
Board. Embedded Micro offers a handful of expansion
shields for the Mojo V3. However, at the time I wrote this
article, there was no video shield available. Well, I don’t
know about you, but that sounded like a great project to
me! So, let’s go on a journey to design a video shield for
the Mojo V3.
■ by Ryan Clarke KJ6MSG
76 Mass Confusion: The End of the
Kilogram as We Know It
This November, in Versailles, France, representatives from
57 countries are expected to make history. They will vote
to dramatically transform the international system that
underpins global science and trade. This single action will
finally realize scientists’ 150 year dream of a measurement
system based entirely on fundamental properties of nature.
The International System of Units — informally known
as the metric system — will change in a way that is more
profound than anything since its establishment following
the French Revolution.
■ by C. A. Hamilton
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Projects & Features
September/October 2018 5