Practical
Electronics
Volume 49. No. 3
March 2020
ISSN 2632 573X
Contents
Projects and Circuits
Diode Curve Plotter by Tim Blythman
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This superb piece of test gear is both practical and educational. It tests zener diodes,
LEDs, schottky diodes, regular diodes, transient voltage suppressors and more.
Audio DSP – Part 3 by Phil Prosser (design) and Nicholas Vinen (words)
In this third and final article, we test the DSP Crossover modules, then connect
them together and power the whole unit up so that it can process sound.
22
Steam Train Whistle / Diesel Horn Sound Generator by John Clarke
Relive the exciting days of steam-train travel with this sound generator, which
can be customised in a number of ways to suit your project’s preferences.
30
Using Cheap Asian Electronic Modules – Part 22 by Jim Rowe
Learn to use the Seeed/Grove-designed galvanic skin response sensor.
36
The Fox Report by Barry Fox
Easy when you know how, or have a decent user manual!
8
Techno Talk by Mark Nelson
Boom time for battery traction
10
Net Work by Alan Winstanley
The latest on Internet-based fraud, ID theft and advice on using 2FA (two-factor
authentication) in your online dealings. Plus, SSDs – can you really entrust them?
12
PIC n’ Mix by Mike Hibbett
Audio Spectrum Analyser – design update
40
Circuit Surgery by Ian Bell
Strain gauge circuit revisited
44
Audio Out by Jake Rothman
PE Mini-monitor crossover for Wavecor drivers – Part 2
48
Make it with Micromite by Phil Boyce
Part 14: Using Bluetooth to set your Micromite free
53
Visual programming with XOD by Julian Edgar
Introducing XOD visual programming for Arduino
60
Max’s Cool Beans by Max The Magnificent
Flashing LEDs and drooling engineers
65
Electronic Building Blocks by Julian Edgar
High-powered voice alarm
76
Teach-In bundle – what a bargain!
Subscribe to Practical Electronics and save money
Wireless for the Warrior
Reader services – Editorial and Advertising Departments
Editorial
Not-so-smart speakers
Exclusive Microchip reader offer
Win a Microchip SAM D20 Xplained Pro Evaluation Kit
Practical Electronics back issues CD-ROM – great 15-year deal!
Practical Electronics – get your back issues here!
PE Teach-In 8
Practical Electronics CD-ROMS for electronics
A superb range of CD-ROMs for hobbyists, students and engineers
Direct Book Service
Build your library of carefully chosen technical books
Practical Electronics PCB Service
PCBs for Practical Electronics projects
Classified ads and Advertiser index
Next month! – highlights of our next issue of Practical Electronics
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Series, Features and Columns
Regulars and Services
Made in the UK.
Written in Britain, Australia,
the US and Ireland.
Read everywhere.
© Electron Publishing Limited 2020
Copyright in all drawings, photographs, articles,
technical designs, software and intellectual property
published in Practical Electronics is fully protected,
and reproduction or imitation in whole or in part are
expressly forbidden.
The April 2020 issue of Practical Electronics will be
published on Thursday, 5 March 2020 – see page 80.
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