Contents
Vol.38, No.04
April 2025
11 3D-MID and IMSE
3D-MID (mechatronic integrated devices) and IMSE (in-mould structural
electronics) are two similar processes used to create three-dimensional
parts with integrated mechanical and electronic functions.
By Dr David Maddison, VK3DSM
Manufacturing technology
34 The Power Grid’s Future, Part 2
Continuing from last month, we look at how solar and wind generators are
connected to the grid to match demand and improve stability. This is done
via various types of inverters, with voltage & inertia control for grid stability.
By Brandon Speedie
Electricity generation
48 Antenna Analysis, Part 3
In the final part of this series, we explain how to calculate the bandwidth of
an antenna matching network. Bandwidth is important for antennas, as it
determines the range of frequencies at which they are effective.
By Roderick Wall, VK3YC
Radio antennas
64 Precision Electronics, Part 6
So far we have covered analog circuitry, but nowadays a lot of circuits are
designed with digital components too, such as a microcontroller. And these
digital/analog signal conversions introduce their own errors.
By Andrew Levido
Electronic design
24 The Pico /2/ Computer
Not to be confused with our previously published Pico Computer from
December 2024, the Pico/2/Computer has an HDMI-compatible video
output, four USB host ports and is optimised for use with MMBasic.
By Peter Mather & Geoff Graham
Computer project
58 Rotating Light for Models
This simple circuit acts as a rotating LED light display, with adjustable
brightness, speed and direction. It’s a flexible project that uses SMD or
through-hole LEDs of any colour, and works great with model kits and more.
By Nicholas Vinen
Model/toy project
72 433MHz Transmitter Module
The 433MHz band is good for short-distance communications and does
not require a licence. You can build this 433MHz transmitter module that is
a drop-in replacement for commercial versions.
By Tim Blythman
Radio control project
82 Power LCR Meter, Part 2
This isn’t just any old LC Meter; it can deliver currents up to 30A for
measuring core saturation of inductors rated up to 1H. And it measures
capacitors to 1F and resistors down to small fractions of an ohm.
By Phil Prosser
Test equipment project
Page 11
3D-MID & IMSE
Manufacturing
Antenna Analysis
and Optimisation
Part 3: Page 48
Page 58
Rotating
Light
for Models
2
Editorial Viewpoint
5
Mailbag
20
45
57
Mini Projects
63
Silicon Chip Kits
71
Online Shop
80
Circuit Notebook
90
Serviceman’s Log
96
Vintage Radio
101
Ask Silicon Chip
103
Market Centre
104
Advertising Index
104
Notes & Errata
1. Discrete 555 timer
2. Weather monitor
Subscriptions
1. 8x8 RGB LED matrix display with WiFi
2. Interchangeable dual triode valves
Astor APK superhet by Jim Greig