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Contents Vol.37, No.02 February 2024 14 Computer Storage Systems, Pt1 From punched cards to flash memory, we cover in depth many of the various permanent storage data systems. The first part of our series will focus on the early storage technologies, while the next part will move towards more modern (and future) inventions. By Dr David Maddison Computer technology 60 ESP32-CAM WiFi Camera Module The Altronics Z6387 is a WiFi and Bluetooth-enabled 2MP (two-megapixel) digital camera utilising the ESP32-S3 microcontroller. It can be interfaced with another microcontroller or used as a standalone device. By Tim Blythman Microcontroller review 68 Electronic Markets in Singapore Sim Lim Tower and Sim Lim Square, in Singapore, are two centres full of shops containing all manner of electronic items. By Tim Blythman Electronic components 104 STC Radiotym model 5160 STC’s model 5160 stands out from other clock radios in the 1950s. While the radio was US-designed, it was assembled in Sydney due to high tariffs on importing completed radios at the time. By Associate Professor Graham Parslow Vintage Radio 28 Microphone Preamplifier This compact microphone preamplifier runs from a 9-15V DC plugpack, offers a flat frequency response, low distortion, low noise and adjustable gain (-15dB to +50dB). It also includes switchable 48V phantom power. By Phil Prosser Audio project 48 Mains Power-Up Sequencer, Pt1 The Mains Power-Up Sequencer offers four independently-controlled 10A mains outputs, making it easy to power up several devices together. This helps with circuit breakers tripping, audio equipment thumps and more. By John Clarke Power control project 72 Raspberry Pi Clock Radio, Pt2 In the final part of this series, we show you how to build and use our Clock Radio and combined media player. Because it’s designed with a Raspberry Pi, you can remotely configure the Clock via the internet. By Stefan Keller-Tuberg Clock radio project 83 Model Railway Points Controller Monitor and switch up to eight sets of points (“railroad switches”) from a single Controller. We also show you how to make LED-based signals to go with each set of points. By Les Kerr Model railway project Microphone Preamp Page 28 Part 1: Page 48 Mains Power-Up Sequencer Page 60 Altronics’ Z6387 ESP32 WiFi Camera Module 2 Editorial Viewpoint 5 Mailbag 43 Circuit Notebook 94 Serviceman’s Log 100 Product Showcase 102 Online Shop 108 Ask Silicon Chip 111 Market Centre 112 Advertising Index 1. Latching relay toggle circuit 2. DHT22 temperature/humidity chart 3. Isolated mains V/I monitor 4. ESP32-based ChatGPT terminal 5. WiFi night light 6. LED-based motion sensor