Fullscreen HTML5Med Res (??MB)HTML4

Contents Vol.18, No.4; April 2005 www.siliconchip.com.au FEATURES   8 Install Your Own In-Car Video Want a reversing monitor and/or an in-car navigation system? Or how about a back-seat screen for entertainment video? Here’s how to do-it-yourself and save money – by Gary Rollans 15 Atlas SCR – Thyristor & Triac Tester You just connect the test leads to the device in any order and press the test button for go/no-go indication – by Peter Smith 36 The Start Of Colour TV In Australia, Pt.2 The sets that we bought 30 years ago and their problems – by Keith Walters Build A MIDI Theremin – Page 24. PROJECTS TO BUILD 24 Build A MIDI Theremin, Pt.1 Connect it to your PC or to a MIDI synthesiser for a truly awesome array of sound possibilities – by John Clarke 60 Bass Extender For Hifi Systems Want an extra octave of bass response from your loudspeakers? This simple circuit will get them pumping – by Rick Walters 70 Build A Professional Sports Scoreboard, Pt.2 Second article has the Control Console assembly plus the control board assembly for the main display unit – by Jim Rowe 78 SMS Controller Add-Ons Install Your Own In-Car Video System – Page 8. Here are three handy add-ons for your SMS Controller: a simple test jig, a PIR sensor interface and a low battery alarm – by Peter Smith SPECIAL COLUMNS 44 Serviceman’s Log Tempest tortures Turkish Teac – by the TV Serviceman 66 Circuit Notebook (1) Automatic Security Lights; (2) Op Amp Auto-Zero Circuit; (3) Synthetic Floating Negative Inductor; (4) Plugpack Checker 80 Vintage Radio The mysterious Monarch D671/32 from Astor – by Rodney Champness Bass Extender – Page 60. 88 Salvage It! A $5 variable voltage power supply – by Julian Edgar DEPARTMENTS   2   4 57 90 Publisher’s Letter Mailbag Product Showcase Order Form siliconchip.com.au 94 97 100 103 Ask Silicon Chip Notes & Errata Market Centre Ad Index $5 Variable Voltage Power Supply – Page 88. April 2005  1