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Contents Vol.33, No.7 July 2020 SILICON CHIP www.siliconchip.com.au Features & Reviews Subtractive Manufacturing is an intriguing subject! There are some incredible machines out there . . . or it could be as simple as a sculptor with a block of stone!     – Page 10 10 Subtractive Manufacturing Long before we started “building stuff” with 3D printing, Subtractive Manufacturing was producing incredibly complex equipment – and it continues today. You start with a block of material and chip away . . . by Dr David Maddison 27 Review: A 100kHz - 500MHz digital RF Power Meter This tiny (59 x 57mm) prebuilt module from Banggood in China costs less than $50 posted to Australia/NZ but gives a very good account of itself – by Jim Rowe 42 Review: low-cost pocket DAB+ receiver. Is it any good? DAB+ Radio is now in all capitals and still expanding. We check out an imported lowcost DAB+ receiver with inbuilt SD card reader. We were impressed! – by Jim Rowe Constructional Projects 30 The all-new Colour Maximite 2 Australia’s world-wide phenomenon continues! The new Colour Maximite 2 is low in cost, easy to build – but is seriously useful. It offers a 480MHz, 32-bit processor, 9MB of RAM and 2MB of flash memory – by Geoff Graham and Peter Mather Banggood’s <$50 RF Power Meter represents really good value for money, as our tests found. It covers from 100kHz to 500MHz – Page 27 44 Ol’ Timer II It’s a clock with a difference: no hands, no digital numbers to read. This one actually spells out the time in words. It’s more than different – it’s unique! – by Tim Blythman 76 Infrared Remote Control Assistant Chances are all those remote controls are starting to get out of control! Here’s a great way to combine functions and save frustration – by John Clarke 90 Digital/Touchscreen RCL Substitution Box, Part II Based on a Micromite BackPack, our new digital RCL box will be a great addition to your test gear. Here’s how to put it together and use it – by Tim Blythman Your Favourite Columns 61 Serviceman’s Log Well-designed thoughtlessness – by Dave Thompson 68 Vintage Workbench Tektronix T130 LC Meter, Part 2 – by Alan Hampel 84 Circuit Notebook (1) (2) (3) (4) (5) Novel method of GPS-locking an oscillator USB privacy dongle emulates keyboard Running Micropython on an ESP32/ESP8266 Multi-output –5 to 12V supply Digital soldering iron timer with relay 100 Vintage Radio Loewe’s1927 OE333: simplicity itself – by Ian Batty Everything Else 2 Editorial Viewpoint    106 4 Mailbag – Your Feedback 111 98 SILICON CHIP ONLINE SHOP   112 siliconchip.com.au 105 Product Showcase    112 Ask SILICON CHIP Market Centre Note and Errata Advertising Index Wow! A new colour Maximite: it’s the ideal way to get into single board computing. It won’t break the bank and is easy to build! – Page 30 Are those cheap imported DAB+ receivers any good? We were pleasantly surprised with this one – which also plays SD cards! – Page 42 It’s a clock quite unlike anything you’ve seen before! Ol’ Timer II very cleverly spells out the time – Page 44 Take charge of all your infrared remote controllers with the IR Control Assistant. You decide what you want to control – Page 76 www.facebook.com/siliconchipmagazine