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Contents Vol.32, No.7; July 2019 Features & Reviews 14 Radiation and Electronics don’t make good bedmates! Natural and artificial radiation sources can have adverse effects in aircraft, spacecraft and even life support systems – by Dr David Maddison 32 Modern PCBs – how they’re made Modern production techniques can mean it’s very economic to have even a small number made for you – as long as you can spare two weeks – by Tim Blythman 61 El Cheapo Modules: AD584 Precision Voltage References Three variations on a theme, all using the AD584 IC from Analog Devices. Obtain highly accurate 2.5V, 5V, 7.5V or 10V references – by Jim Rowe Constructional Projects SILICON CHIP www.siliconchip.com.au Making radiationproof devices is the holy grail – and they’re making some real advances – Page 14 You can still make PCBs at home but for the price, speed and service of commercial PCB houses, it’s hardly worth the bother! – Page 32 Got a second or “house” battery in your van or 4WD? Here’s how to charge it safely! – Page 24 24 Dual Battery Isolator for 4WD, RVs, Caravans, etc If you run a second 12V battery in your vehicle, van, etc you know you cannot simply connect them in parallel. This cheap, solid-state isolator will allow the second battery to charge while the engine is running – by Bruce Boardman 44 Speech Synthesis using a Raspberry Pi Zero With a low-cost Raspberry Pi and our simple hardware and software, you can make your projects talk – in just about any language. If you want, they can even play music! – by Tim Blythman 74 Building the RF Signal Generator (Part 2) If you’re into HF or VHF radio, you really need an RF SigGen. This one is low cost and quite simple to build. And this month, we get into doing just that: building it! – by Andrew Woodfield 86 DSP Active Crossover and 8-channel Parametric Equaliser The third (and final) part of this incredibly versatile project shows you how it all goes together, testing/troubleshooting and finally connect it to your system. Plus we show and explain all 32 control screens – by Phil Prosser and Nicholas Vinen Your Favourite Columns 68 Serviceman’s Log Repairs for a “key” client – by Dave Thompson 94 Vintage Radio Built a project but you’d like it to “talk” or play music? It’s easy with this simple hardware and software– Page 44 With a usable range up to 150MHz, this RF Signal Generator is a great addition to any workbench – Page 74 The National Panasonic AKQ Walkabout portable – by Ian Batty 99 Circuit Notebook (1) Guitar practice preamplifier based on inverters (2) 74LS-series and 74HC-series logic tester (3) Electrocardiogram based on Micromite Plus Explore 100 (4) Horse racing game using an alphanumeric LCD Everything Else! 2 Editorial Viewpoint 4 Mailbag – Your Feedback siliconchip.com.au 43 Product Showcase 104 SILICON CHIP ONLINE SHOP   Ask SILICON CHIP 106 111 Market Centre Australia’s electronics Index magazine 112 Advertising Finishing off the DSP Active Crossover and 8-channel Parametric Equaliser – Page 86 July 2019  1 www.facebook.com/siliconchipmagazine