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Contents Vol.35, No.9 September 2022 14 Display Technologies, Part 1 This two-part series ventures through the history and technology used in video displays, from the Nipkow disc and the earliest CRT screens to the latest in quantum dot and laser displays. The first part of this series covers the earliest technologies up to the advent of LCD screens. By Dr David Maddison Tech feature 44 Creality CR-X Pro 3D Printer We review the Creality CR-X Pro, a dual-filament 3D printer available from Jaycar (Cat TL4411). It takes standard 1.75mm filament and has a print area of 300 x 300 x 400mm. By Tim Blythman 3D printer review 66 History of Silicon Chip, Part 2 Leo Simpson picks up the history of Silicon Chip magazine from 1993, including a failed attempt to enter the US market, the start of an offshoot magazine (Zoom), and a series of exceptional audio amplifiers. By Leo Simpson 30 WiFi Programmable DC Load, Pt1 This Electronic Load can handle up to 150V and sink 30A at up to 300W, providing it with enough power to test a variety of devices! Along with multiple different safety features, it is controllable from the front panel or via WiFi, and offers automated testing and data-logging capabilities. By Richard Palmer Test equipment project 56 New GPS-Synchronised Analog Clock Convert an ordinary wall clock into a highly-accurate timekeeper using our New Analog Clock Driver. It automatically adjusts for daylight saving, and will run for up to eight years with a pair of C cells, or two years with AAs. By Geoff Graham Timekeeping project 76 Mini LED Driver This small, low-cost module can drive relatively large 12V LEDs or panels from a USB or 5V DC power source. It can handle inputs up to 20V <at> 4A and has adjustable output current and voltage up to 20V <at> 1A. By Tim Blythman LED/lighting project 82 Wide-Range Ohmmeter, Part 2 To finish off our new Ohmmeter, we cover the construction details, go over the testing procedures and list a bunch of troubleshooting tips. After finishing it we show you how to put it to use. By Phil Prosser Test equipment project Cover background: a TV test pattern, typically used to calibrate screens Page 14 The History and Technology of VIDEO DISPLAYS Page 56 GPS-Synchronised Analog Clock mini Page 76 LE river 2 Editorial Viewpoint 4 Mailbag 29 Product Showcase 90 Serviceman’s Log 98 Circuit Notebook 1. Using a PICAXE as an Arduino co-processor 2. Simple USB power delay timer 100 Vintage Radio 106 Online Shop 108 Ask Silicon Chip 111 Market Centre 112 Advertising Index 112 Notes & Errata AVO valve testers, part 2 by Ian Batty