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Comrol of Speech Playback AUGUST 22. 1974 ICATION 87 Soundsheet: Variable Speech Control 96 Scheduling and loading IC test systems 104 Designing data acquisition into minis Electronics® co mrol of Speech Playback efin eV ..qc -4 IL.) —J 0.500" MIN. Dialight t 4,-10.210" 0.120 - elP. 0.190" 521-9207 sees aneed • (Need: The widest choice for your every application.) 521-9206 521-9189 Your choice of green, yellow and red, with axial leads for dense packaging requirements. Wide viewing angle for 521-9202 easy readability. Low power consumption, low cost, IC compatible. 10mA operation for typical brightness. Size is identical to the most popular red LEDs. 521-9165 .192" .11 .7 •500 " .0454 (mIN.) .240" Now available in green, yellow and red. Mini-sized for maximum front panel density and easy panel mounting. High luminous intensity, low cost. Vibration/shock resist- ant. Solid state for long life. Wide viewing angles. Ideal for applications like panel lighting, film annotation and alpha-numeric displays. 550-0204 550-0405 550-0306 rt .185" .245" LED logic state fault indicators available in 14 models with voltage ratings from 1.7 to 14. Suitable for dense 11 packaging on printed circuit boards—up to 10 units to the inch—IC compatible. With built-in series resistor. MIN. 9 .340" Polarity identified. Low power consumption. Dialight, the company with the widest choice in 1.-.100- -0-11 -•- .020" switches, LEDs, indicator lights and readouts, Mix 'em or match 'em. LED logic state fault indicators looks for needs .. your needs .. and then they are available in red, yellow and green, in a variety of develop solutions for your every application. No shapes, some with a built-in integral resistor. Can be driven from OIL and TTL logic. Designed for easy align- other company offers you one-stop shopping in all ment on PC boards so that multiple functions can be these product areas. And no other company has displayed. more experience in the visual display field. Dialight helps you do more with these products than any other company in the business, because we are specialists that have done more with 4 .343" them. Talk to the spe- „ --iila-- .030" 521-9184 cialists at Dialight first. ulAi'Lin .185" You won't have to talk Dialight. A North American Prolips Company t .1 to anyone else. 203 Harrison Place, Brooklyn, N. Y. 11237 (212) 497.7600 .430"-4«- .550" MIN. 521-9183 Available in red or clear LED packages with or without a built-in current limiting resistor. Red LED is also made without resistor. Suitable for circuit status indication, alpha-numeric displays and visual indicators. Features See long wire-wrappable leads. IC compatible with solid state reliability. High luminous intensity, low power consump- tion, low cost. Dialight Circle 900 on reader service card HP CALCULATORS SOLVE YOUR PROBLEMS, YOUR WAY MOVISI OP-CODE COWER:fez LOGFLOWER, FRCU 1 J i:r$8tie4E 2 3 4 5 %*N ..5.. .0—.5... 0. 14, , e CSS60%000%\%0 0100100010 0 te0e: ergo il StesCItostSttt't,'s 01 Clen,11.2.3 t tecot 0170 I'S \ 1/8 ,11RiettSC,S,Cs 1.S;s•Y;1\eqt :1.5 05 .11 e Simulate Logic Designs Directly From Your Schematic... And slash your digital development and leadtime digital simulation with the 9830 adds up to more costs with the HP 9830 Programmable Calculator. professional satisfaction for you; more profit for Team the 9830 up with our new Logic Simulation your firm. Not only does it eliminate the drudgery Software and you'll have apotent calculator-aided of hand-generated timing diagrams, it also lets design system that will verify your digital designs— you neatly sidestep the slow turnaround time of long before you've spent anickel on a prototype. outside services. Most importantly, it means an With incredible speed and precision, the 9830 end to costly prototype reworks. runs through all possible input conditions and You can reap the benefits of an HP 9830 with associated bit streams, generates the state/time Logic Simulation Software for just $332* per map, then complete logic documentation. month. For complete details or ademonstration, Interconnect lists. Truth tables. Timing. call your local HP Sales Office, or send us the And since the 9830 sits right on your desk, you coupon. We think you'll agree, it's the logical can interact with your design. Use your experience solution to your digital design problems. and training to guide the model to its optimum 'Domestic U.S.A. price only. Lease, where available, includes service contract. configuration in afraction of the time required by other methods. Tell me more about your HP 9830 CAD Logic Simulation System Combinational or sequential circuits. MOS Information only. [7 Hands-on demonstration. logic. TTL/DTL logic. No matter what circuit type, Iwork with these families of circuits: TTL MOS DTL Other Name Title_ Company r HEWLETT ei PACKARD Address City State Zip Phone Sales and service from 172 offices in 65 countries PO 188, 301 10,4-and C0101aCIO 8053/ Hewlett-Packard Co. P.O. Box 301; Loveland, CO 80537 816C Electronlcs/August 22,1974 Circle 1 on reader service card 1 Piece-by-piece, HP'S new 21MX series. Minis no other OEM supplier can offer at any price. Modular computers that give you all the flexibility you want. And all the extras you'd probably order special on other systems. A basic system costs just $3927.* And gives you features like 4K MOS RAM memory, memory parity, 128 instruction set, user microprogrammability, floating point, ROM bootstrap loaders, and a unique front panel. Call us and find out about the entire 21MX series. Before your competitor does. After all, he's working for a living, too. HP minicomputers. They work for aliving. HEWLETT hp PACKARD Miff Sales and service from 172 offices in 65 countries 1501 Page Moll Road, Palo Alto Ca',forma 94304 'In quantities of 50, domestic USA price. 22418 2 Circle 2 on reader service card Electronics/August 22, 1974 Electronics The International Magazine of Electronics Technology VOL 47, No. 17•August 22, 1974 29 Electronics Review Highlights LAW ENFORCEMENT: Citizen alarm sends digital codes, 29 MILITARY: Reconnaissance cameras favor charge-coupled devices, 30 Cover: Fast or slow tapes sound equally clear, 87 BUSINESS: Layoff ripples widen in semiconductor industry, 31 When equipped with a new IC-based con- COMPONENTS: Circular connector gets single standard, 31 trol, any tape-recorder will play back taped INDUSTRIAL: Process control gets new competitor, 32 speech at different rates without the usual SOLID STATE: Microprocessors get new FACE, 34 INDEX OF ACTIVITY: 34 distortions. Proof that the process works is NEWS BRIEFS, 36 contained on the special sound sheet facing AUTOMOTIVE: Congress wants to ease up on seat-belt interlocks, 38 the article. Cover is by designer Ann Dalton. INDUSTRIAL: Microchip helps identify drugs, 38 CONSUMER: Bowmar introduces digital LED watch, 40 Radar sales surge, 72 Goldmark markets music-teaching aid, 40 Manufacturers in the U.S. and Europe are happily reporting an unanticipated boom in 52 Electronics international JAPAN: Bucket-brigade IC aimed at audio uses, 52 orders for ground-based surveillance sys- HUNGARY: Graphic display may compete in U.S., 52 tems from many nations in the Third World. AROUND THE WORLD: 53 Maximizing an IC test system's throughput, 96 Constructing a tight schedule for an IC test 69 Probing the News system and deciding what number of test AVIONICS: Fiber-optics excites the military, 69 AIR DEFENSE: Radar sales flying high, 72 stations will handle a given load best is not MANUFACTURING: X-ray lithography enters device stage, 80 so difficult if you start from the basics—the ELECTRONICS ABROAD: Ireland attracts offshore plants, 82 time needed to position the average device, and the time needed to test it. 87 Technical Articles CIRCUIT DESIGN: Control speeds, slows tape without distortion, 87 Wescon will be big on new jobs, technology, 120 PACKAGING & PRODUCTION: Scheduling for IC tester optimization, 96 So great is the need among western elec- DESIGNER'S CASEBOOK: Timer, doubler form dc-dc converter, 101 SCR zero-cross trigger limits maximum load factor, 102 tronics firms for process engineers, MOS COMPUTERS: Building an analog peripheral inside a minicomputer, 104 circuit designers, programers, and tech- ENGINEER'S NOTEBOOK: Circuit measures optical coupler speed, 109 nicians that any who show up at Wescon Programable cable tester spots opens and shorts, 110 are likely to receive several job offers— Simulating an npn/pnp pair for high-voltage switching, 112 unofficially, of course. Other effects of tech- WESCON: Experienced engineers, technicians scarce in the west, 120 Professional program emphasizes applications data, 126 nological development and change will be found in Wescon's technical sessions 133 New Products (p. 126), with their emphasis on micro- WESCON 74 PRODUCT PREVIEW: processors and charge-coupled devices, Multi-signal generator offers programable phase, 133 Thin-film networks: key to converter precision, 134 and among the new products on display Low-cost tester checks out IC memories, 134 (p. 133). Instrument modules packaged for special markets, 136 System aimed at low-energy ion implantation, 136 And In the next issue . INSTRUMENTS: Signal source is 'universal,' 151 Designing low-cost receivers for Omega SEMICONDUCTORS: Decade divider handles 1.2 gigahertz, 159 navigation . .how a microprocessor can PACKAGING & PRODUCTION: Goldplating is done selectively, 165 benefit a data-acquisition system . .mini- INDUSTRIAL: Adding control to measurement, 179 MATERIALS: 184 computers in action, part 9: mini-aided component insertion. Departments Publisher's letter, 4 Readers comment, 6 40 years ago, 8 People, 14 Meetings, 20 Electronics newsletter, 25 Washington newsletter, 49 Washington commentary, 50 International newsletter, 55 Engineer's newsletter, 114 New literature, 190 Electronics/August 22, 1974 3 Electronics Publisher's letter we think that the best way to and the sound sheet.
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