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Silicon Chip BACK COPIES February 1988: 200 Watt Stereo Power Amplifier; Deluxe Car Burglar Alarm ; End Of File Indicator For Modems; Low Ohms Adaptor For Multimeters; Line Isolation Unit For Phone Patch; Easy Tips On Headphone Repair. March 1988: R~mote Switch For Car Alarms; Telephone Line Grabber; Endless Loop Tape Player; Build Your Own Light Box; New Life For RadioCassette Players; Old-Time Crystal Radio. April 1988: Walkaround Throttle For Model Railroads, Pt.1 ; pH Meter for Swimming Pools; Slave Flash Trigger; Headphone Amplifier For CD Players; What Is Negative Feedback, Pt. 1 ; Mobile Antennas For The VHF & UHF Bands. May 1988: Optical Tachometer For Aeromodellers; High Energy Ignition For Cars; Ultrasonic Car Burglar Alarm ; Walkaround Throttle For Model Railroads , Pt. 2; Designing & Building RF Attenuators; Motorola MC3334P High Energy Ignition IC Data. June 1988: Stereo Control Preamplifier (uses LM833). Pt.1 ; Breakerless Ignition for Cars Using Hall Effect Pickups ; Mega-Fast Nicad Battery Charger; Automatic Light Controller Uses PIR Detector; RF Sniffer Probe & Preamplifier; What is Negative Feedback, Pt.2. July 1988: Stereo Control Preamplifier, Pt.2 ; Fitting a Fuel Cut-Off Solenoid; Booster for TV & FM Signals; The Discolight Light Show, Pt.1; Tone Burst Source for Amplifier Headroom Testing; National Semiconductor LM833 Op Amp Data; What is Negative Feedback, Pt.3 . August 1988: Building a Plasma Display; Universal Power Supply Board ; Remote Chime/Doorbell ; High Performance AC Millivoltmeter, Pt.1 ; Discolight Light Show, Pt.2; Getting the Most Out of Nicad Batteries; Data on Insulated Tab Triacs. September 1988: Hands-Free Speakerphone; Electronic Fish Bite Detector; High Performance AC Millivoltmeter, Pt.2; Vader Voice; Motorola MC34018 Speakerphone IC Data; National Semiconductor LM12 150W Op Amp Data & Applications; What is Negative Feedback, Pt.4. October 1988: Stereo FM Transmitter (uses Rohm BA 1404); High Performance FM Antenna; Matchbox Crystal Set; Electronic House Number; Converting a CB Radio To The 28MHz Band; Electronics & Brock's BMW Blaster; Queensland's Powerful Electric Locomotives . November 1988: 120W PA Amplifier Module (uses Mosfets) ; Poor Man's Plasma Display; Automotive Night Safety Light; Adding a Headset To the Speakerphone; How To Quieten the Fan In Your Computer; Screws & Screwdrivers, What You Need To Know; Diesel Electric Locomotives. December 1988: 120W PA Amplifier (With Balanced Inputs), Pt.1 ; Diesel Sound Generator; Car Antenna/Demister Adaptor; SSB Adaptor for Shortwave Receivers; Electronics & Holden's New V6 Engine; Why Diesel Electrics Killed Off Steam ; Index to Volume 1. January 1989: Line Filter for Computers; ~ ,---------------------------------- • --7 I Please send me a back issue for: □ February 1 988 □ March 1 988 □ April 1 988 I I n May 1 988 rJ June 1988 □ July 1988 □ August 1 988 □ September 1 988 I I □ October 1 988 0 November 1 988 □ December 1988 □ January 1989 □ February 1 989 I I U March 1 989 r-1 April 1989 □ May 1989 □ Ju·ne 1989 □ July 1989 Use this handy form to order your back copies I LJ August 1 989 □ September 1 989 □ October 1989 □ November 1989 I □ January 1 990 0 February 1 990 □ March 1 990 □ April 1990 tI 1 1 I I I I I I I □ December 1989 Enclosed is my cheque/money order for $ _ _ _ _ _ _ or please debit my □ Bankcard □ Visa Card □ MasterCard Card No. J Price: $A5.00 each (includes postage). Overseas orders add Signature _ _ _ _ _ _ _ _ _ _ _ _ Card expiry date_~'--$A 1 .00 per issue for postage . NZ & PNG orders are sent by air mail. Name_ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ (PLEASE PRINT) Detach and mail to: SILICON CHIP PUBLICATIONS Street___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ PO BOX 139 COLLAROY BEACH NSW 2097 Suburb/town _ _ _ _ _ _ _ _ _ _ _ _ Postcode____ OR FAX: (02) 982 9553 I II I II l I ~--------- -------------------------- ---~98 SILICON CHIP Ultrasonic Proximity Detector for Cars ; Simple Computer Sound Repeater; 120W PA Amplifier (With Balanced Inputs) Pt. 1 ; How to Service Car Cassette Players; Massive Diesel Electrics In the USA. February 1989: Transistor Beta Tester; Minstrel 2-30 Loudspeaker System; LED Flasher for Model Railways (uses LM3909); Build a Simple VHF FM Monitor (uses MC3362). Pt.1 ; Lightning & Electronic Applian ces; Using Comparators to Detect & Measure. March 1989: LED Message Board , Pt.1 ; 32-Band Graphic Equaliser, Pt.1 ; Stereo Compressor for CD Players; Map Reader for Trip Calculations ; Amateur VHF FM Monitor, Pt.2; Signetics NE572 Compandor IC Data; Electronics for Everyone - Resistors. April 1989: Auxiliary Brake Light Flasher; Electronics for Everyone : What You Need to Know About Capacitors ; Telephone Bell Monitor/ Transmitter; 32-Band Graphic Equaliser, Pt.2 ; LED Message Board, Pt.2. May 1989: Electronic Pools/Lotto Selector; Synthesised Tom -Tom ; Biofeedback Monitor For Your PC; Simple Stub Filter For Suppressing TV Interference; LED Message Board , Pt.3 ; Electronics for Everyone - All About Electrolytic Capacitors. June 1989: Touch-Lamp Dimmer (uses Siemens SLB0586); Passive Loop Antenna For AM Radios; Universal Temperature Controller; Understanding CRO Probes; LED Message Board, Pt.3 ; Coherent CW - A New Low Power Transmission Technique. July 1989: Exhaust Gas Monitor (uses TGS812 Gas Sensor) ; Extension For the Touch-Lamp Dimmer; Experimental Mains Hum Sniffers; Compact Ultrasonic Car Alarm ; NSW 86 Class Electrics; Facts On the PhaxSwitch - Sharing Your Phone Line With A Fax Machine. August 1989: Build A Baby Tower AT Computer; Studio Series 20-Band Stereo Equaliser, Pt.1; Garbage Reminder - A 7-day Programmable Timer; Introduction to Stepper Motors; GaAsFet Preamplifier For the 2-Metre Band; Modern 3-Phase Electric Locomotives. September 1989: 2-Chip Portable AM Stereo Radio (uses MC13024 and TX7376P) Pt.1 ; Alarm-Triggered Telephone Dialler; High Or Low Fluid Level Detector (uses LM1830N) ; Simple DTMF Encoder (uses Texas TMC5089); Studio Series 20-Band Stereo Equaliser, Pt.2 ; Auto-Zero Module for Audio Amplifiers (uses LMC669) ; A Guide to Hard Disc Drives . October 1989: Introducing Remote Control ; FM Radio Intercom For Motorbikes (uses BA 1404 and TDA?000) Pt.1 ; GaAsFet Preamplifier for Amateur TV; 1 Mb Printer Buffer; 2-Chip Portable AM Stereo Radio, Pt.2; Installing A Hard Disc in the PC; A Look at Australian Monorails. November 1989: Radfax Decoder For Your PC (Displays Fax, RTTY and Morse); Super Sensitive FM Bug ; Build A Low Cost Analog Multimeter; FM Radio Intercom For Motorbikes, Pt.2 ; 2-Chip Portable AM Stereo Radio , Pt .3; Floppy Disc Drive Formats & Options ; The Pilbara Iron Ore Railways . December 1989: Digital Voice Board (Records Up To Four Separate Messages , Uses Texas TMS3477NL and 256K RAMs); UHF Remote Switch ; Balanced Input & Output Stages ; National Semiconductor LM831 Low Voltage Amplifier IC Data ; Install a Clock Card In Your PC ; Index to Volume 2. January 1990: Service Tips For Your VCR ; Speeding Up Your PC; Phone Patch For Radio Amateurs; High Quality Sine/Square Oscillator; Active Antenna Kit; The Latest On High Definition TV; Speed Controller For Ceiling Fans. February 1990: 16-Channel Mixing Desk; High Quality Audio Oscillator, Pt.2 ; The Incredible Hot Canaries; Random Wire Antenna Tuner For 6 Metres; Phone Patch For Radio Amateurs , Pt.2 ; PC Program Calculates Great Circle Bearings. March 1990: 6/ 1 2V Charger For Sealed Lead-Acid Batteries ; Delay Unit For Automatic Antennas ; Workout Timer For Aerobics Classes ; 1 6-Channel Mixing Desk, Pt.2; Using The UC3906 SLA Battery Charger IC; Digital Waveform GeMration Using a PC; The Controls On A Model Aircraft. April 1990: Dual Tracking ± 50V Power Supply; VOX With Delayed Audio; Relative Field Strength Meter; 16-Channel Mixing Desk, Pt .3 ; Simple Service Tips For Your Microwave Oven ; Model Aircraft Aerodynamics ; Active CW Filter For Weak Signal Reception . Note: November 1 98 7 , December 198 7 & January 1988 are now sold out. Serviceman's Log ctd from page 64 didn't reveal anything, at least he had some background which might assist some of his more experienced colleagues in pinpointing the fault. So, with the bottom cover removed and the PTT button permanently activated - by simply clamping the microphone gently in the bench vice - he went over the boards with an insulated prodder, gently at first, then more vigorously when there was no response. Nothing happened until he touched one corner of the matrix board, ever so gently. The readout flickered and up came the correct frequency. That produced mixed feelings. All the joints on that board were of his own making, so if one was dry it was his fault. But careful scrutiny with a high power glass revealed nothing. What about the 10-pin plug and socket feeding the matrix board? It was a long shot but a spray of contact cleaner wouldn't . do any harm. That done, he was replacing the matrix board when something caught his eye. On the sub-board, beneath the matrix board, there are several components; four ICs, three transistors, and several resistors and capacitors. And it was one of the resistors. These are mounted vertically, with the upper pigtail turned over to return to the board. And each pigtail was protected with a plastic sleeve, in case it made contact with the underside of the matrix board above it. But the sleeve on one resistor had worn through, revealing bare pigtail. And it didn't take a genius to work out that it had been rubbing against the underside of the board, eventually making contact with it. Of course, that was it. The cure was to simply push the resistor over at a slight angle, thus reducing its effective height by a couple of millimetres. That was several weeks ago and there has been no trouble since. But I can't help wondering how many Icom 22S sets may be gathering dust due to a simple fault like this. ~ MAY 1990 99