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Contents Vol.34, No.9 September 2021 SILICON CHIP www.siliconchip.com.au Features & Reviews 14 Advanced Imaging – Part 2 Imaging technologies aren’t just used for medical purposes; they can also be used in airports for X-ray inspections, reconstructing ancient or damaged objects via a CT scan and more – by Dr David Maddison 27 The Cromemco Dazzler The Dazzler board by Cromemco could be considered one of the first ‘reasonable’ computer graphics devices capable of producing a colour image. It generates an NTSC signal which can be fed to a TV – by Dr Hugo Holden 48 Review: IOT Cricket WiFi Module The IOT Cricket is a small, low-power WiFi module by Things On Edge. It incorporates an ESP8266 and could potentially be powered for years(!) from a pair of AA cells – by Tim Blythman 86 Review: the tinySA Spectrum Analyser For just $80, this spectrum analyser works over 0.1MHz-350MHz and 240960MHz ranges with selectable resolution bandwidth. It has a colour display and separate signal generator mode – by Allan Linton-Smith The Cromemco Dazzler was the first colour graphics card for the S-100 bus computer. It was released in 1976, and came as two separate S-100 boards which had a total of 72 ICs – Page 27 Constructional Projects 38 Touchscreen Digital Preamp with Tone Control – Part 1 This preamp has four external stereo inputs plus two stereo outputs. It uses a colour touchscreen and has IR remote control functionality. Bass, mid and treble presets are provided, plus volume control – by Nicholas Vinen & Tim Blythman 61 Second Generation Colour Maximite 2 – Part 2 Finishing off our shiny new 2nd Gen Colour Maximite 2, we cover construction details and running your first program – by Geoff Graham & Peter Mather 66 Tapped Horn Subwoofer Using just a single 8-inch driver, this subwoofer’s response extends below 30Hz and can deliver over 100dB SPL (sound pressure level) – by Phil Prosser 82 Micromite to a Smartphone via Bluetooth Even a Micromite can be used as the heart of an Internet of Things (IoT) project! Building this simple project on a breadboard provides you with an easy way to control a Micromite using your Android smartphone – by Tom Hartley Your Favourite Columns Our new Digital Preamp uses a classical Baxandall style volume and tone control circuitry to achieve the low noise and distortion expected of an analog design. It can be controlled via a colour touchscreen or an infrared remote – Page 38 The IOT Cricket is a tiny, ultra low-power ESP8266-based WiFi module – Page 48 75 Serviceman’s Log ‘Playing’ with fire – by Dave Thompson 90 Circuit Notebook (1) Multiple RAM banks for the IR Remote Control Assistant (2) Solar garden light using a supercap (3) 1-2-5 switching arrangments (4) Simple tripwire alarm (5) Letterbox counter 96 Vintage Radio Sanyo 8-P2 TV (1962) – by Dr Hugo Holden Everything Else 2 4 94 106 Editorial Viewpoint Mailbag – Your Feedback Silicon Chip Online Shop Product Showcase 107 111 112 112 Ask Silicon Chip Market Centre Notes and Errata Advertising Index This Tapped Horn Subwoofer is built into a modestly-sized cabinet which measures 50 x 90cm with a width of 28.2cm. You don’t need much more than a hand-held circular saw, drill and clamps to assemble it – Page 66