Practical
Electronics
Volume 53. No. 9
September 2024
ISSN 2632 573X
Contents
Projects and Circuits
Build Your Own Calibrated Microphones by Phil Prosser
14
This phantom-powered, balanced and calibrated microphone is ideal for measurement
applications but is also great for recording work. You can choose from multiple different
microphone capsules that can be calibrated to produce an almost flat response.
30
Modern PIC Programming Adaptor by Nicholas Vinen
Program most newer PIC microcontrollers out-of-circuit with this PIC Programming
Adaptor. It works using a PICkit or SNAP programmer and suits 8- to 40-pin micros.
With external adaptors, you program SMD chips in SOIC, SSOP or TSSOP packages.
60
Salad Bowl Speakers by Phil Prosser
These stylish speakers are surprisingly good performers considering they’re made
using salad bowls from IKEA. They are simple to build but they can handle 50W RMS
per channel.
Series, Features and Columns
Techno Talk by Max The Magnificent
Artificial intelligences (AIs) are appearing everywhere.
4
The Fox Report by Barry Fox
Cautionary food for thought
6
Net Work by Alan Winstanley
The impacts of Artificial Intelligence on society, practical tips for online security and
protecting data, plus more news on the Space Race and the faltering EV market.
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26
Using Electronic Modules – 1.3-inch monochrome OLED by Jim Rowe
This 128x64 pixel, 1.3in (33mm) OLED display module is perfect for driving with an
Arduino or Micromite due to its wide availability, I2C interface and low cost.
Circuit Surgery by Ian Bell
Digital Signal Processing – Filter Requirements
41
Audio Out by Jake Rothman
Audio switching Part 4 – real electronic switching
46
Max’s Cool Beans by Max The Magnificent
Connecting batteries in series/parallel and BCD to 7-segment decoders
52
Teach-In 2024 – Learn electronics with the ESP32 by Mike Tooley
Part 7 – Telling the Time
70
Regulars and Services
Made in Australia & the UK.
Written in Britain, Australia,
the USA and Ireland.
Read everywhere.
© Silicon Chip Publications Pty Ltd 2024
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 October 2024 issue of Practical Electronics will be
published on Thursday, 5 September 2024 – see page 80.
Practical Electronics | September | 2024
Editorial
Hello from the other side of the planet
Reader services – Editorial and Advertising Departments
Teach-In bundle – what a bargain!
Subscribe to Practical Electronics and save money
Practical Electronics back issue downloads
Wireless for the Warrior
Direct Book Service
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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