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Vol.9, No.9; September 1996 Contents FEATURES 10 Technology At Work: Making Prototypes By Laser This revolutionary new process uses lasers to produce functional plastic prototypes. Here’s a look at how it works – by Julian Edgar 53 Neville Thiele Awarded IREE Medal Of Honour IREE recognises achievements in TV, audio and loudspeaker design 68 Cathode Ray Oscilloscopes, Pt.5 Digital storage oscilloscopes are rapidly supplanting analog designs. We take a look at how they work – by Bryan Maher EASY TO BUILD HF AMATEUR RADIO RECEIVER – PAGE 28 PROJECTS TO BUILD 16 Build A VGA Digital Oscilloscope; Pt.3 Final article has the construction details – by John Clarke 28 A 3-Band HF Amateur Receiver Build this simple SSB receiver and tune into the 20, 40 & 80-metre amateur radio bands – by Leon Williams 54 Infrared Stereo Headphone Link; Pt.1 Break that annoying wire link between your headphones and your hifi or TV set with this project. This month, we describe the transmitter – by Rick Walters 60 High Quality Loudspeaker For Public Address INFRARED STEREO HEADPHONE LINK – PAGE 54 This high power design features a wide frequency response and is ideal for music and voice in a large listening area – by John Clarke 80 Feedback On The Programmable Ignition System Upgraded software plus hardware tweaks and improvements to enhance engine operation – by Anthony Nixon SPECIAL COLUMNS 40 Serviceman’s Log A bounce with a twist (and a 3-year delay) – by the TV Serviceman 84 Vintage Radio Vintage radio collectors and collecting – by John Hill DEPARTMENTS 2 Publisher’s Letter 3 Mailbag 8 Circuit Notebook 83 Order Form 90 93 95 96 Product Showcase Ask Silicon Chip Market Centre Advertising Index HIGH QUALITY PA LOUDSPEAKER SYSTEM – PAGE 60 September 1996  1