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Contents Vol.35, No.12 December 2022 14 James Webb Space Telescope The James Webb Space Telescope (JWST) is the newest and most advanced telescope yet. It was launched on December 25th, 2021 with the goal of gathering information on the universe. By Dr David Maddison Space exploration feature 48 Jaycar QC1938 Oscilloscope Jaycar’s QC1938 two-channel, 100MHz digital oscilloscope was released just a few months ago, with many handy features at a low cost. By Tim Blythman Test equipment review 76 nRF5340 DK Development Board Pages 31 & 40 Dual-channel Power Supply for BREADBOARDS dual- channel oscilloscope Jaycar QC1938 Nordic Semiconductor’s nRF5340 DK is a development board with a dualcore ARM chip. It’s Arduino-compatible and is a good starting point for designing products with Bluetooth, NFC or other wireless communications. By Tim Blythman Microcontroller module review 31 Dual-channel Breadboard PSU This power supply is designed to help you take the mess out when prototyping new designs on a breadboard. It plugs straight into a breadboard’s power rails and has two adjustable current-limited outputs. By Tim Blythman Power supply project Page 48 Page 62 40 Breadboard PSU Display Adaptor Combine the Breadboard PSU from above with this Display Adaptor to show lots of handy data, such as the set and actual voltages and currents. It even includes extra voltmeter and ammeter channels for analysis. By Tim Blythman Power supply project 62 Active Monitor Speakers, Part 2 This month, we cover how to build the power supply, prepare the chassis and arrange the wiring for the Active Crossover Amplifier. Plus, there’s a section to help troubleshoot most problems that could occur. By Phil Prosser Audio project 81 Digital Boost Regulator The multi-tasking Digital Boost Regulator can generate an adjustable voltage from 5V to 20V without a dedicated boost chip. This is possible due to its use of a PIC16F1846 microcontroller. By Tim Blythman Microcontroller project Active Monitor Speakers with optional subwoofer Digital Boost Regulator Page 81 2 Editorial Viewpoint 88 Online Shop 107 Ask Silicon Chip 4 Mailbag 90 Circuit Notebook 111 Market Centre 112 Advertising Index 112 Notes & Errata 47 Subscriptions 54 Serviceman’s Log 94 1. mmPi add-on for Raspberry Pi 2. Two different positive DC outputs from a centre-tapped transformer 3. Traverser for model railway Vintage Television RCA 621TS TV by Dr. Hugo Holden