EverMore ST-K700 User Manual

liandlscm $2.50 U.S. 2.95 CANADA DECEMBER 1987 O. 48784 tranK THE MAGAZINE FOR TH Build BIONIC EARS Hear every sound in stereo! INCLUDING 12 -PAGE GA

8 P.O. BOX 567 VAN NUYS, CA 91408 BLACKLIGHT ASSEMBLY Fyn f functioning assembly t, includes ballast, , .c-- ¡,( on -off switch, = power cord, s

r Electronics Paperback Books GREAT ELECTRONICS PAPERBACKS FROM ETT $ o . ~7y I ti , I p IL; 771 . mm I N Ilia a .,.. INand BP125 -25 SIMPLE AMATEUR

CIE MAKES THE WORLD OF ELECTRONICS YOURS. Today's world is the world of elec- tronics. But to be a part of it, you need the right kind of trainin

NEW PRODUCTS internal -memory locations. A total of 64 polyphonic sounds can be played, and ed- ited solo preset sounds can be stored and used polyph

actly as given on an FCC test or received measurable lower noise and cross -talk. on the air: message store-lets you enter a The Pro -Control Four h

U D J 14 BUILD -IT BOOKS FOR EXPERIMENTERS Modern Op An,I, Protect, BP106- MODERN OP- AMP PROJECTS . $5.00. Wide range of build - it projects that

CIRCLE 56 ON FREE INFORMATION CARD erWriter and Hewlett -Packard's Laser - Jet printers and Allied's Linotronic type- setter. Every fa

CIRCLE 7 ON FREE INFORMATION CARD EARN YOUR B.S.E.E. DEGREE I THROUGH HOME STUDY Our New and Highly Effective Advanced- Place- ment Program for e

Dept. of Labor, State Department, Bu- reau of Land Management, NORAD, NOAA, Army Corps of Engineers, Na- tional Science Foundation, National Bu

REFERENCE BOOKS FOR HOBBYISTS 4 8P62 -THE SIMPLE ELECTRONIC CIRCUIT $6.50. All the funda- mental theory necessary to get a full understanding

NRI Trains You At Home -As You Build Your Own IBM -Compatible Computer GET THE KNO WHO W TO SERVICE EVERY COMPUTER ON THIS PAGE Learn the Basics the

BEGINNERS RP I 55 EASY -TO -BUILD ELECTRONIC PROJECTS Ards Cl ftl Cr.W RFCT061. SELECT 5 BOOKS for only $3 95 B (values to $117.70) and get a Free Gi

22 By Don Jensen e year in review and other things LET'S WRAP UP 1987 BY UPDATING some of the subjects covered in the past 12 months'

tends to open a bit earlier in the afternoon and close down later in the morning. The next three segments I call the mid- dle hands. They are 7,1

24 newsl r? A newspaper on ,.:. QAITHOUGH WE'RE ALL FAMILIAR WITH the idea "whose time has finally come," we rarely hear of thos

ing -the user determines when to flip the page forward or backward. That feature allows you to flip back a page or two. using the Page Up key,

26 fLLl$ ON ANTIqUI By Marc Ellis E RADIO DONE OF THE THINGS I ENJOY THE MOST about writing this column is the reader mail. Every week or so,

rubber and cast with an epoxy- molding compound. Both Materials were avail- able, at the time, from Emerson and Cum - ing, 869 Washington St.,

28 Which Way To YOUR Future? Are you at a crossroads in your career? Have you really thought about it? Are you planning for your future, or perha

DECEMBER 1987 BIONIC EARS When all is said and done you'll tch every word with this device that would put a Doberman's sense of hearing to s

30 How Does it Work? A pair of precision solar reflectors, with mini electret - mike elements located at their focal points, collect the sound

shaped to hold the pipe fitting in the center of the reflector and at the focal point. The rod is soldered to the fitting and kept in place

Elect da ._ i It3 29 39 43 61 73 32 59 64 75 78 79 67 69 22 24 26 88 93 96 98 2 4 6 14 37 47 71 Volume 4, No. 12 INCLUDING lf 12 -PAGE GADOt Decemb

CHECK /ADJUST YOUR COLOR TV USING A CAMCORDER OR VCR There's no reason to have a color TV if the colors are wrong, but who can afford all the te

YELLOW CHARTREUSE BLUE Fig. 1 -The color wheel provides a good way of viewing how the three primary additive colors combine to produce all the colors

U z O U w w Begin with the crosshatch pattern consisting of white lines on a flat black background (see Fig. 3). Using rubber ce- ment, glue an

TV needs repairs. Vary brightness over its range and verify little or no shift in colors. If playback through the direct -video jack is excellent,

36 which causes the screen to go dark. Set the service switch to Service. Advance the R screen pot until a faint red line is visible

Here are your free FactCards! Introducing Hands -On- Electronics FactCards. Each issue, Hands -On- Electronics will present 3 new FactCards, each

55 ads «I FactCard 4093: Quad 2 -Input NAND Schmitt Trigger STATIC ELECTRICAL CHARACTERISTICS CH AR AC- TERISTIC CONDITIONS LIMIT at 25'C (TYP)

LINE DIETUNB.NCE MONITON By Fernando Garcia Viesca LINE DISTURBANCE MONITOR Don't be left in the dark about AC -line problems. Enlighten yourself

40 co Q Y - N Y ¢ .-- co p, r 2 O f`- 1 1 ¢ U co c^ e cc" ¢ Ma o U p j 0 m, ¢ < -1A11r11 PIC O O f7 1 xx pN e 8 get Z Y ^ti cv ¢ r ¢ c 11

Detection The processed noise signal is fed to U2 -a. Whenever the noise peaks exceed 6 volts (As set by biasing resistors R9 and RIO). the coni

2 The Magazine for the Electronics Activist! It's gift -giving time Christmas is almost here and it is the occasion for largess apportionin

44 The diode between the power and the lamp drops about 0.7 volts, which extends the lamps life. Without the diode the lamp would give bright l

R22. 15K: Transistors Q15 and Q16 form a simple non -symmetrical multivibrator. It changes frequency with changes in voltage; that, coupled w

F1 J1 4)1j11 pJ }0 6V L1 Q4 1N4001 Q6 1 N4001 05 1 N4001 07 1 N4001 +v C13 T470-1000 GND Fig. 5 -The synthesizer model, or any souped -up version

DECEMBER 1987 THE NEWSLETTER FOR GROWN-UP KIDS What's Inside. . . GADGET Newsletter: An Editorial 2 Running Commentary: The Nike Monitor 3 Pho

GADGET: The Story Thus Far It was still light and surprisingly warm when I left the Haymarket Theatre in London several months ago, having ju

Jock's Vox NINE MONITOR. Manufactured by: Nike, Inc., 3900 S.W. Murray Blvd., Beaverton, OR 97005. Price: $200. Just when you thought it w

EOS Ethos CANON EOS 620. Canon U.S.A., Inc., One Canon Plaza, Lake Success, NY 11042. Price: $770. Autofocus cameras have become a staple of the &

Olympian Heights OLYMPUS INFINITY AUTOFOCUS CAMERA. Manufactured by: Olympus Corp., Crossways Park, Woodbury, NY 11797. Price: $275. "Anyone, any

Close Listening BEYERDYNAMIC STEREO HEAD- PHONES (DT 990). Manufactured by: Beyerdynamic, 505 Burns Ave., Hicks- ville, NY 11801. Price: $185.

R. I. P. CALORIE WATCH. Manufactured by: Biotechnology, Inc. (address unknown). Price: $49.95. What began as a test of an intriguing fitness access

DO YOU REALLY car THE BEST BUY FROM THEM? et 's face it: There will always be some outfit that can undercut a published price. They do it by

Sky King SONY AIR 7 RADIO /SCANNER. Manufactured by: Sony Corp. of Japan, Tokyo International, P.O. Box 5100, Tokyo 100 -31, Japan. Price: $269.

ELEKTRONIKA RECORDER (Cont. from p. 1) machine's contact. If there is an on /off switch on this recorder, it would take a counter -intellige

PhotoVest Color LCD TV /MonitoT The Fip One of the things that dyed -in- the -wool gadgeteers enjoy doing is finding unexpected uses for items. Alt

The premise behind this credit card security gizmo puts us in mind of the "Finda -key" devices of a few years ago. From Creative Design (

It may not be a new idea, but CBM America Corp. (2999 Overland Ave., Los Angeles, CA 90064) is offering it at what seems bargain price. The produ

REBUILD A SOLDERING STATION Unlike most other things, Weller temperature -controlled soldering irons were meant to be rebuilt. And it's easy to d

60 The switch assembly contains a small switch- indicated by the pointer - and a magnetic tip. Notice the screws held to the tip by a magnetic fi

AUDIBLE INFRARED REMOTE INDICATOR Check the operation of all your infrared- remote transmitters with this easy -to -build IR detector By Homer L. Dav

The remote transmitter is placed with its sending end against the IR detector of the Audible Infrared -Remote Indicator. Pressing a control button on

Give a Friend A "Hands -On" Experience for Christmas.. . Does fighting the crowds at Christmas short - circuit your holiday fun? Don&a

L JLJ Hands -on Electronics, 500B Bi- County Boulevard, Farmingdale, New York 11735 First Time Writer I'd like very much to submit a story t

ONESHOT PC BOARD You can etch printed- circuit boards for small projects: It's really easy - even if you've never done it before! By Peter A

l R3 4i6 6K --Lr RI 22052 U 1 .0015 2 3 CS209 8 7 6 C2 0022 -T R2 75052 O LEDI S 1 C ¡ B1 .01 i 9V . T Fig. 1 -To illustrate this simple procedur

66 Mount the components, and solder them in place. Attach the 9 -volt connector. switch, and sensor. Clip off the excess lead length, and you&apos

Nolo /Legisoft WillWriter Program Use your computer and printer to prepare and update your valid will! GOOD OL' HARRY! HARRY LIVED A full life

68 S E E M A N U A AL P R 9 REMAINING PROPERTY It is essential that you name a beneficiary to tale your RESIDUARY estate (any property not alre

THE IRWIN 110D TAPE BACKUP SYSTEM Being both paranoid and lazy, I was in a real dilemma about the files on my hard disk. I knew that if it

70 gram. Eztape is an amazing piece of software. All choices are made from menus by moving a cursor bar or by choosing the first letter of a c

':.. %4511', 11111 Rompp DIGITAL 1144 LOGIC PROBE 7 When you need to quickly check the input or output status of logic gates, a digital logi

74 +v . PROBE INPUT o- GND R1 12K 01 1N914 R3 R2 100K 5.6K 0E-- 4/0. 4-1A4- R4 100K RESET Z 4-O 0-o-R6 10 22K *R7 R 0 13 22K 9 Ulh 4 1/4 LM324 7 L

HIGH SEAS RADIO PIRATE Some Eroll Flynns of the electronic age are swashbuckling with big brother himself. Will Goliath crush David this time? By Don

7 7 _ _ - ____ __,_ 17 C O R P O R A T I O N 1- 800 -344 -4539 AK, Pueno"Rico 218.881 6074 Tele 82827914 FAX 218 -881 -7180 TWA 91035089

legal station and bust its 18 -year old operator. The FCC hasn't forgotten that embarrassment, claimed Radi Steele, 30, RNI operations manag

At a Boston dock, the group quietly began outfitting the ship's station. "There was no cloak and dagger," said Steele. "We

78 REPLACING RECHARGEABLE BATTERIES You can find and replace wired -in NiCd cells and repair the valuable gadgets they power! YOUR FIRST THOUGHT MUST

MODULATION AND DEMODULATION By Louis E. Frenzel. Jr. Before information passes from point A to point B, it should be conditioned to ensure its in

Fig. 2 -The information signal (sometimes called intelligence) depicted in A, conditions the amplitude of the carrier as shown in B. Note the unmo

Sidebands I"he modulation process causes new signals, called side- bands, to be generated. Sidebands are signals that occur above and below

82 MODULATING SIGNAL -VG RF Fig. 8- Amplitude modulating a carrier is as easy as changing the gain of an output amplifier for the carrier itself. Th

FM is also widely used. There are FM radio stations, TV sound is FM. FM is also preferred for most two -way mobile radios and is used in c

84 The phase -locked loop chip is the Signetics 565. It con- tains a VCO, phase detector, and amplifier. An external resistor and capacitor se

15052 +12v 10 002 -q FREQUENCY 100K DETERMINING COMPONENTS 15052 +12V 4.7K 47K 3 13 2 10 4.7K 1 14 10 CARRIER OUTPUT (ABOUT 35KHz) 10K 141 OP AMP SUM

6 i\J Printer Stand The Vertistack Printer Stand supports an 80- column printer and its paper with- out using any desk space. The user may

86 A B C D E Fig. 19-Once a modulating signal (A) is added to a carrier (B), the resulting signal (C) must be rectified (D) and then sent t

TRIGGERING POINT ON SCOPE FREQUENCY VARIATIONS / Fig. 21- Frequency variations look terrible on the scope. The only way to be sure that the circuit

88 By Marc Saxon ER ON SCANNERS Here's a . COBHA /DYNAS( AN IIASN I 141.1.N LI.I -- ting the grass grow under its feet since the company e

Discover-Explore-Experience Today's Electronics With Now you can meet the challenges of today's electronics quickly and easily. This profess

92 We have found it an excellent reference guide at our VHF /UHF monitoring sta- tion, especially useful for filling up sev- eral open or little

j(Inl!1 I L J o By Charles D. Rakes Convert from dot and bar indicators to numerical readouts This month's circus offers two dif- ferent, and

94 PARTS LIST FOR THE DOT /BAR TO AUDIO CONVERTER SEMICONDUCTORS 01- 010- 2N3906, 2N3638, 2N4249, or similar PNP transistor U1 -3914 dot /bar displ

1.0 volt, 1.9 to 2.0 volts, and on through O. As the output of the chip goes from one digit to the next, there's a time when two outputs are i

96 By Joseph J. Carr, K4IPV °3 ON HAM RADIO Radio Propagation: the phenomena of "skip" [,EARLIER IN THIS SERIES, WE TOOK A look at the bas

The ionosphere is divided for purposes of radio propagation studies into various layers that have somewhat different prop- erties. Those layers are

Electronics Cleaner The secret to prolonged lite and proper operation of all electronic and electrical equipment is TEC (Total Electronics Clea

U z o (S U w J w z o ch z x 98 By Byron G. Wels THINK TANK Singing the unsung heroes... _AIM ENO ONE EVER DOES ANN I RING ALL BY himself or her

snap. Both have a gate. so there's no in- dication there. But. the triac has two main terminals (designated MTI and MT2). while an SCR has

CI is uncharged and the Darlington pair. consisting of QI and Q2 are cut off so no power goes to the relay coil. The car's ignition syste

HIGH SEAS RADIO PIRATES (Continued from page 77 With a promise from the pair that RNI would not return to the air while the cases were pending.

WELS' THINK TANK (Continued from page 100) INO- R1 10K4 Fig. 7 -This dinky little amplifier's one -watt output is more than sufficient for

ONE SHOT SHOOTING (Continued from page 46) ator. A resistor connected momentarily from the base of Q7 to plus 3 -4-1/2 volts should cause the lamp t

HANDS -ON MARKETPLACE FOR SALE CABLE -TV converters. New Zenith flash, Scien- tific Atlanta. Jerrold. Oak. Zenith. Hamlin. Many others. "New&q

PROJECTION -TV...Convert your TV to project 7 foot picture...Results comparable to $2.500.00 proj- ectors...Total cost less than $30.00... Plans an

LINE DISTURBANCE MONITOR (Continued )rnm I))1(' 4'I 106 Fig. 4-Be sure the hot, negative, and ground leads for your project are properly w

The Electronic Industries Association /Consumer Electronics Group has recently completed the first in a series of videocassette training tapes. EIA/CE