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Contents Vol.20, No.10; October 2007 SILICON CHIP www.siliconchip.com.au Features 10 DVD Players: How Good Are They For HiFi Audio? Dedicated audio CD players are now relatively expensive so what are the compromises in using a cheap DVD player instead? – by Mauro Grassi DVD Players: How Good Are They For HiFi? – Page 10. 18 Agilent DS05054A 4GS/s 500MHz Digital Scope Looking for a high-end digital scope? This new model from Agilent really has the goods – by Mauro Grassi Pro jects To Build 26 Oscar: Electronic Noughts & Crosses Game The first Oscar used 70 telephone relays & was as big as a fridge. The 2007 version uses a PIC micro and fits in a zippy box! – by Brian Healy 32 PICProbe: A Versatile Logic Probe This PIC-based logic probe fits inside a pen case and works down to 2.7V. Build it as your first surface-mount-device project – by Ross Purdy 40 Rolling Code Security System; Pt.1 Versatile IR unit is ideal for keyless entry and features an alarm system, two door-strike outputs and provision for up to 16 transmitters – by John Clarke 68 Simple Data-Logging Weather Station; Pt.2 Oscar: An Electronic Noughts & Crosses Game – Page 26. PIC-Based Logic Probe – Page 32. Second article has all the details on the mechanical construction, including the tipping rain bucket and the temperature sensor housing – by Glenn Pure 82 AM Loop Antenna & Amplifier Build it to improve your AM reception and to listen to long-distance AM stations you only dreamed existed – by Branko Justic & Ross Tester Rolling Code Security System – Page 40. Special Columns 63 Serviceman’s Log Fix it in the carpark! – by the TV Serviceman 92 Circuit Notebook (1) Bi-Directional Variable Speed Drive With Regenerative Braking; (2) Pea & Thimble Or 3-Card Trick; (3) Emergency Lights Controller; (4) Two Novel LED Flashers; (5) Adjustable Q For Subwoofer Equaliser 98 Vintage Radio Nazi Germany’s Peoples’ Radio (Volksempfaenger) – by Rodney Champness Departments   2   4   9 79 Publisher’s Letter Mailbag Order Form Product Showcase siliconchip.com.au 104 Ask Silicon Chip 107 Notes & errata 110 Market Centre AM Loop Antenna And Amplifier – Page 82. October 2007  1