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_, _/ ~ _/ ~ ~ ... _/ ~ _/ "'f_f_J _J -'fl-j~ -·-'A ~ _/ ~ ~ _/ _/ -,_J_ "J /..&_ _/ '-iL=-l _/ ~ ~ _J _/ J / u _J _J 1/_J ---..,J '..,I - -- :~_c , !I J _/ ...a.../ r, _J _J _J _/ :::!, _jl ..i _J' J _/ _/ _J' -l' _/ _/ }I "'""' srwolWlll~ ....,,_~- ~ ;;,.~~ -t · O', ~: . :; :~ }~. ·-,'c_~ OUR NEW STEREO AMPLIFIER delivers 50 watts per channel into 8-ohm loads. This month, we give you the full construction details. Turn to p.18. _/ _/ Vol.5, No.4. April 1992 FEATURES 6 Understanding Computer Memory by Paul Lynch Learn how computer memory is organised 14 Yokogawa's 100MHz Digital CRO by Leo Simpson Features an in-built thermal printer ADD INFRARED REMOTE control to your model railroad. Our project on p.64 has pulse power, inertia, braking & full overload protection 56 The Electronic Workbench by Darren Yates A low-cost circuit simulation package PROJECTS TO BUILD 18 Studio Twin Fifty Amplifier, Pt.2 by Leo Simpson & Bob Flynn Second article has the construction details 30 Build The Executive Thingie by Darren Yates Produces four tones to calm those frazzled nerves 64 lnfrared Remote Control For Model Railroads by John Clarke Uses the original Railpower pulse controller board 76 Differential Input Buffer For Oscilloscopes by John Clarke Lets you observe mains waveforms in calibrated mode SPECIAL COLUMNS 36 Serviceman's Log by the TV Serviceman Found dead in a motel room 42 Amateur Radio by Garry Cratt A SAMSUNG TV set "carked" it in a motel room this month but was brought back to life by the Serviceman. The story starts on page 36. Receiving weather satellite signals - the hardware required 53 Remote Control by Bob Young Switching frequencies in speed controllers 84 Vintage Radio by John Hill The basics of receiver alignment DEPARTMENTS 2 4 12 56 88 Publisher's Letter Mailbag Circuit Notebook Product Showcase Back Issues 90 Ask Silicon Chip 93 Order Form 94 Market Centre 96 Advertising Index THIS DIFFERENTIAL INPUT buffer will allow you to monitor calibrated mains waveforms on your oscilloscope & to observe signals which cannot be referenced to earth. Details p. 76. APRIL 1992 1