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4 May 2015
A question on op-amp accuracy, getting certified,
and some tips on batteries.
10 PICAXE Primer
Sharpening Your Tools of Creativity
PICAXE-PC Serial Communication — Part 1.
We’ll continue our experiments with the Prolific
cable, but this time focus on sending data back and
forth between a PICAXE processor and a PC.
19 The Ham’s Wireless Workbench
Practical Technology from
the Ham World
Move up in frequency to the oscillators which make
the signals that drive the ham’s wireless world.
62 Open Communication
The Latest in Networking and
Serial I/O Data Interfaces: Part 2.
Get familiar with the high speed gigabit serial
interfaces that dominate I/O today since we all use at
least one of these regularly.
68 The Design Cycle
Advanced Techniques for
Wi-Fi on the Big Wire.
Classic embedded Wi-Fi web servers based on
microcontrollers have met their match. The ACKme
Numbat stuffs an ARM microprocessor, Wi-Fi radio,
TCP/IP stack, UART, real time clock, multiple GPIO
pins, analog-to-digital converters, PWM generators,
SPI portals, 1 MB of serial Flash, and an I2C interface
into a 0.8” x 0.6” x 0.11” SMT package. All you need
is a PC serial port and a terminal emulator to gain
access to the Numbat’s rich set of resources.
26 Build the Retro Regen Radio
This back-to-the future one-tube radio is made
with readily available parts, operates on 12 volts,
and offers amazing performance.
■ By Dick Whipple
36 Beyond the Arduino — Part 3
This time, we’ll focus on interacting with the
bare-metal microcontroller by handling both
digital and analog inputs.
■ By Andrew Retallack
45 How to Use a Transistor as a Switch
Whether you need to flash an LED, energize a relay,
turn a buzzer or alarm on or off, or invert a voltage
level, the NPN transistor switch can easily solve
your problem. This article shows you how to use a
transistor as a simple SPST switch.
■ By Roger D. Secura
50 Fix Up that Old Radio!
It’s fun and easy to bring vintage radios back to life!
Follow along as a 1937 De Wald radio is restored.
■ By J. W. Koebel
57 Receiving Data with a Low Cost
A computer, some powerful software, and a
shortwave receiver combine to make decoding
many types of radio transmissions possible.
■ By George R. Steber Columns
The eBay Treasure Hunt
07 READER FEEDBACK
24 NEW PRODUCTS
74 NV WEBSTORE
78 TECH FORUM
81 AD INDEX