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Contents Vol.37, No.07 July 2024 14 Repairable Electronics Modern electronics tend to be hard to repair, either because parts are difficult to source or due to the design. Bucking this trend are devices made to be easy to fix, including modular parts and open-source hardware. By Dr David Maddison, VK3DSM Repairs & open-sourcing 39 The Raspberry Pi 5 Released last September, the Raspberry Pi 5 is their newest single-board computer. Nearly every aspect of the Pi 5 is a dramatic improvement, running at least twice as fast as the Raspberry Pi 4B. By Tim Blythman SBC review 58 Adding solar charging to a van We added solar panels (plus an inverter) to the roof of a Renault Kangoo ZE electric van. With the panels we have as much as an extra 50km of driving a day just from solar energy! By Roderick Boswell Electric vehicles 26 Automatic LQ Meter Page 26 Automatic LQ Meter Raspberry Pi 5 Review: Page 39 Adding solar charging to an electric van This all-in-one design combines two instruments into one, measuring inductance from 0.1μH to 999μH and Q (quality factor) from 10 to 300 with a test frequency from 100kHz to 90MHz. By Charles Kosina Test instrument project 44 180-230V DC Motor Speed Controller This Speed Controller is intended for high-voltage DC motors like those in lathes, treadmills, conveyor belts and more. It is rated for motors from 1A to 10A and has zero to full speed control plus speed regulation. By John Clarke Motor speed control project 54 New use for Mains Sequencer With some wiring adjustments and software updates, our Mains Power-Up Sequencer from February & March 2024 can be repurposed to cycle power to multiple devices for use with inverters & generators. By John Clarke Mains power control project 64 Jaycar-sponsored Mini Projects Mimick a lava lamp with this month’s first Mini Project. Or instead build a digital compass powered via a battery bank. Each project is designed so that anyone can build it. By Tim Blythman Mini projects 72 Workman 1kW Loudspeaker These genuine 1000W speakers deliver a tremendous amount of sound using a tool chest you can buy from Bunnings as the enclosure. The durable enclosure keeps it safe and makes it easy to transport. By Allan Linton-Smith Loudspeaker project Page 58 2 Editorial Viewpoint 5 Mailbag 80 Vintage Radio 86 Serviceman’s Log 94 Circuit Notebook 97 Subscriptions 98 Online Shop 100 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata One-valve superhet radio by Fred Lever 1. JFET-based guitar preamp 2. Push-pull PWM Mosfet driver