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Contents Vol.10, No.3; March 1997 FEATURES 7 Driving A Computer By Remote Control The latest-generation remote access software makes it possible to control a computer at a distant location via the telephone line. We look at two popular packages – by Ross Tester 30 Video Conferencing: The Coming Boom Video conferencing is set to revolutionise face-to-face communications. Here’s a rundown on how it works – by Sammy Isreb 76 Cathode Ray Oscilloscopes; Pt.7 DRIVING A COMPUTER BY REMOTE CONTROL – PAGE 7 Learn how the display tubes used in modern digital scopes work and how the image is built up on the screen – by Bryan Maher PROJECTS TO BUILD 18 Plastic Power PA Amplifier Rugged design includes a 100V line transformer, thermal cutout and DC offset adjustment and puts out 175W – by Ross Tester 34 Signalling & Lighting For Model Railways We describe two separate projects for your model railway: a 3-aspect signal unit and a constant brilliance lighting circuit – by Jeff Monegal 40 Build A Jumbo LED Clock Read the time at 50 paces. This digital clock has very large LED displays and is based on readily available CMOS ICs– by John Clarke PLASTIC POWER PA AMPLIFIER – PAGE 18 58 RGB-To-PAL Encoder For The TV Pattern Generator Simple add-on board replaces the discontinued TEA2000 RGB-to-PAL colour encoder IC used in the TV Pattern Generator – by John Clarke 72 Audible Continuity Tester This nifty little continuity tester varies its tone according to the resistance being measured – by Rick Walters SPECIAL COLUMNS 52 Serviceman’s Log The rich tapestry of servicing – by the TV Serviceman 62 Radio Control Preventing RF interference on the 36MHz band – by Bob Young SIGNALLING & LIGHTING FOR MODEL RAILWAYS – PAGE 34 82 Vintage Radio The importance of grid bias – by John Hill DEPARTMENTS 2 3 28 86 89 Publisher’s Letter Mailbag Circuit Notebook Product Showcase Order Form 90 92 95 96 Back Issues Ask Silicon Chip Market Centre Advertising Index BUILD A JUMBO LED CLOCK – PAGE 40 March 1997  1