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Contents Vol.39, No.04 April 2026 20 The History of Intel, Part 3 The final part in our series concentrates on Intel’s present and future. That includes their most recent desktop processors (Meteor Lake) and their current attempt at making dedicated GPUs with Intel Arc. By Dr David Maddison, VK3DSM Electronics feature 44 Power Electronics, Part 6 The History of Intel Part 3: page 20 Image source: Konstantin Lanzet https://w.wiki/GVqx In this series of articles, we explore the principles of power electronics. This month, we cover DC-AC converters and, for a practical example, we calculate the thermal losses in the switching elements of an IGBT bridge. By Andrew Levido Electronic design 56 Whole-house Thermal Logging Designing a home with many energy-efficient aspects was a big goal for me when building my own house. One way I did this was by incorporating multiple sensors (temperature, humidity etc) in various locations. By Julian Edgar Home temperature logging 92 Tektronix 2465B Oscilloscope The vintage 2465B is an analog oscilloscope with some problems that come with old age. It actually has a lot of the features that you would expect from a digital ‘scope, but without the sampling or aliasing concerns. By Dr Hugo Holden Vintage Electronics 35 PicoSDR Shortwave Receiver Supporting AM, AM-Sync, LSB, USB, FM & CW, this software-defined shortwave radio receiver has a tuning range from 3-30MHz. It does all this using a Raspberry Pi Pico or Pico 2. By Charles Kosina Radio project 50 DCC/DC Stepper Motor Driver This compact design drives stepper motors and can take its speed signal from either a DC voltage, or a Digital Command Control (DCC) system in a model railway. It supports bipolar stepper motors with adjustable speed. Part 6 by Tim Blythman Model train / motor control project 66 Calliope Amplifier The Calliope is an updated version of our old Hummingbird amplifier from 2021. We have used newer parts that are readily available (along with alternative parts) and made minor improvements to the design. By Phil Prosser Audio project 78 Micromite-based Music Player Using little more than a Micromite LCD BackPack and a DFPlayer Mini module, this project can play MP3 files from a microSD card. It is capable of driving a 4Ω loudspeaker. By Gianni Pallotti Audio project Page 56 Whole-House Environmental Logging Page 78 Micromite-based MUSIC PLAYER 2 Editorial Viewpoint 4 Mailbag 16 Circuit Notebook 65 Subscriptions 77 Kits 84 Serviceman’s Log 90 Online Shop 101 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata 1. Digital vehicle compass 2. 44-pin Micromite adaptor