1. Outer Front Cover
2. Contents
3. Publisher's Letter: Software: too many bugs, too many updates
4. Mailbag
5. Feature: The 2020 mission to Mars by Dr David Maddison
6. Project: 20A DC Motor Speed Controller by John Clarke
7. Feature: How USB Power Delivery (USB-PD) works by Andrew Levido
8. Feature: El Cheapo Modules: USB-PD chargers by Jim Rowe
9. Project: Model Railway Level Crossing by Les Kerr
10. Circuit Notebook: Coded door buzzer by Benabadji Mohammed Salim
11. Circuit Notebook: Adding shuffle feature to low-cost MP3 player module by Les Kerr
12. Circuit Notebook: DIY pulse oximeter by Bera Somnath
13. Project: Silicon Labs-based FM/AM/SW Digital Radio by Charles Kosina
14. Review: Tecsun PL-990 radio receiver by Ross Tester
15. Project: Advanced GPS Computer – Part 2 by Tim Blythman
16. Serviceman's Log: I’ve repaired planes before, but never tanks by Dave Thompson
17. Vintage Radio: The Rowe AMI JAL-200 jukebox by Jim Greig
18. PartShop
19. Product Showcase
20. Ask Silicon Chip
21. Market Centre
22. Advertising Index
23. Notes & Errata: Advanced GPS Computer, June 2021; Mini Arcade Pong, June 2021; Refined Full-Wave Motor Speed Controller, April 2021; USB Flexitimer, June 2018
24. Outer Back Cover

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