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Contents Vol.37, No.01 January 2024 14 Smart Home Automation Home automation can be very convenient, but it does come with major security and privacy concerns. We detail many of the home automation systems that are currently available and whether they will work without third-party ‘cloud’ services over the internet. By Dr David Maddison Internet of Things (‘IoT’) Raspberry Pi Clock Radio 44 WiFi Relay Modules We take a look at two relay modules based on the ESP-01, one from Jaycar (XC3804) and the other from Altronics (Z6427). Both can be remotely controlled over WiFi. By Tim Blythman Using electronic modules 64 4-digit, 14-segment LED Module Instead of the common seven segments per character, this LED module has 14 segments per character, letting it display a greater range of letters, numbers and symbols. By Jim Rowe Using electronic modules Page 28 USB to PS/2 Keyboard Adaptor 92 Restoring the Vintage QUAD 303 The Quad 303 amplifier and Quad 33 preamplifier from 1967 were a ‘treat’ to refurbish and compare well to other valve amplifiers from the same period. The design is similar to a modern ‘blameless’ amplifier. By Jim Greig Vintage hifi system 28 Raspberry Pi Clock Radio, Pt1 A modern alarm clock can take the trouble out of alarm setting and time keeping. This clock runs off most of the common models of Raspberry Pi (3, 4, Zero 2W etc) and can act as a Bluetooth media player. By Stefan Keller-Tuberg Clock/media player project 52 USB to PS/2 Keyboard Adaptors Although USB keyboards are plentiful, there are still devices that only have a PS/2 connector. This project makes it simple to connect a USB keyboard (and mouse!) to devices with a PS/2 connector, like the VGA PicoMite. By Tim Blythman Computer add-on project 68 Secure Remote Switch, Pt2 The Secure Remote Switch is designed to control low-voltage appliances such as a garage door controller. In this second and final part, we show you how to build and use it. By John Clarke Remote control/security project 74 Multi-Channel Volume Control, Pt2 Control the volume of up to 20 channels using this Volume Control. All that’s left to cover is construction and getting it running. By Tim Blythman Audio project Page 52 2 Editorial Viewpoint 4 Mailbag 41 Circuit Notebook 84 Serviceman’s Log 90 Online Shop 99 Subscriptions 1. ePaper clock and calendar 2. Semiconductor curve tracer 100 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata