ETI PROJECT INDEX number + project + date 1428 Audio filter Mar 90 618 Metronome Mar 90 1202 Chip-on-board applications Feb 90 1548 Dual rail power supply module Feb 90 753 1:1 HF Antenna balun Feb 90 1201 Simple intercom Jan 90 749 SWR meter Jan 90 1626 Digital to analog converter Jan 90 1625 2400BPS PC in-modem-Part II Dec 89 1625 2400BPS PC in-modem-Part I Nov 89 1624 Speed display for PCs Jul 89 1623 Input/output card Jun 89 1622 Turbo modem May 89 1621 Programmable amp/delay EQ Sep 89 1620 Printer buffer - Part II Mar 89 1620 Printer buffer - Part I Feb 89 1618 Modem - Part II Jan 89 1618 Modem P+1 Dec 88 1617 Applix disc drive Oct/Nov 87 1616 Basic Jun 87 1615 16-bit VGA card - Part II Sep 89 1615 26-bit VGA card - Part I Aug 89 1614 PC Turbo board Nov 88 1613 Baby AT Aug/Sep/Oct 88 1612 VZ-300 data logger Jul 88 1611 VZ-300 EPROM programmer May/Jun 88 1610 Speech controller Mar 88 1609 Apple modem card Oct 87 1608 RS232 switcher Jul 87 1607 Commodore talker May 87 1606 RIE 'BEE extender Nov 86 1605 FORTH A-D card Sep 86 1604 Twin joystick for 'Bee Aug 86 1603 Commodore tape duplicator Oct 86 1602 Commodore function switches Aug 86 1601 RS232 for Commodore Jul 86 1550 Telescope drive controller Oct 89 1547 150 ms/s flash converter - front end Dec 89 1546 Reaction timer Nov 89 1545 Galvanic skin response meter -biofeedback Oct 89 1541 Sound trigger Nov 88 1539 Metal detector - ultra simple Jan 89 1537 Phone recorder Dec 88 1536 Electronic combination lock Mar 89 1534 Speedometer module Jul/Aug 88 1533 300W power supply (BEWARE: many errors!) Nov/Dec 86 1532 Iron temperature controller Sep 86 1531 Brown out protector May 86 1530 Noise detector Feb 86 1528 Door controller Jul 85 1527 Burglar alarm module May/Jun 85 1526 Fibre optic link Apr 85 1525 Motion detector Jun 87 1524 Electronic mousetrap Aug 84 1523 Electronic scales Jun/Jul 84 1522 Multiple light controller Mar/Apr 84 1521 Digital exposure meter Mar 84 1520 Wide band amplifier Jul 83 1518 Video enhancer Dec 83 1517 Video distributor board Sep 83 1516 Model engine ignition Jun 83 1515 Drill speed controller Apr 83 1514 Solid state relays Nov 83 1513 Digital frequency doubler Jan 86 1512 Electric fence tester Feb 83 1511 Zero crossing temperature controller Feb 83 1510 Model train controller Jan 83 1509 Universal DC/DC inverter Sep 82 1508 Model train controller Dec 82, Dec 83 1507 Light bulb saver Nov 85 1506 Bicycle flasher (xenon) Jul 82 1505 Emergency fluoro light unit Aug 82 1503 Standby battery charger Aug 81 1502 Sling psychometer Dec 83 1501 Negative ion generator Apr 81 1500 Metal detector - coils unavailable Dec 80, Apr 81 1426 Quarter wave speaker Dec 88 1432 Audio toolkit Jun 89 1430 DIGI-125 power amplifier May 89 1429 Noise Gate Feb 89 1425 Guitar note extender Aug 88 1424 Versatile guitar preamplifier Nov 87 1423 Stereo encoder Oct 88 1422 Budget column speakers Dec 84 1421 Input and tone control preamplifier May 84 1420 Indoor paging amplifier system Jul 84 1419 Bench amplifier Sep 88 1418 Expandable audio mixer Aug/Sep/Oct 88 1417 Vifa-100 speakers Jul 88 1416 Chorus unit Jul 87 1415 Vifa SA-80 speakers Jun 88 1414 Walkman amplifier Sep 88 1413 Parts list, errata for 1413 Jul 88 1413 Electronic Crossover Jun 88 1412 Stereo loudspeaker switcher Feb 87 1411 Headphone distribution box Feb 89 1410 Bass guitar amplifier Aug/Sep 84 1409 Passive radiator Mar 87 1408 Scan audio HF speakers Feb 87 1407 Dynamic noise reduction system Dec 86 1406 Parametric equaliser module Aug 86 1405 Stereo enhancer Mar 85 1404 Four channel mixer Jul 85 1402bDigital Sampler Expansion Apr 88 1402 Sampler Apr/May/Jun 86 1401 DI box Sep 85 918 Polyphone light beam transceiver Sep 82 905 Organ Jan 83 824 Slot car controller Dec 81 815 Raffle Monitor Jan 89 814 Electronic dice Aug 79 813 Race track Jan 79 812 Wheel of fortune Dec 78 811 Tank game Oct 78 810 TV game Jun 78 807 Tub o'war Aug 84 806 Skeet Jan 78 805 Drunken sailor Oct 77 804 TV game Nov 76 803 Cannonballs and missionaries Dec 75 802 Windicator Feb 75 801 LINC May 75 789 Simple shortwave receiver Jul 89 782 Quad Antenna Dec 89 781 Novice loop antenna Nov 89 780 Novice tx May/Jun 76 764 AM transceiver part 2 May 87 760 Video RF modulator Oct 81 757 Cat RTTY/FAX Nov/Dec 85 756 VZ-200 RTTY tranceiver Nov/Dec 84 755 RTTY transceiver Nov/Dec 84 750 FM bug Dec 85 750 6m amplifier Dec 83 748 RF monitor with LED bargraph Nov 89 747 Baudot to Centronics converter May 88 746 AM Transceiver Apr/May 87 744 UHF/VHF tuner Apr 86 743 25W UHF power amplifier Jun 85 742 Broadcast/coms speaker Feb 85 741 10 channel synth radio mic Dec 84, Jan 85 740 FM tuner Feb/Mar 76 739 AM stereo decoder Oct 84 738 UHF booster amplifier Jul 84 737 70cm preamplifier May 84 736 Picture plucker Sep 83 735 UHF to VHF TV converter May 81 734 Phone patch line interface May 83 733 Microbee RTTY Apr 83 731 RTTY modulator board Sep 79 730 RTTY receiver converter Aug 79 729 UHF masthead amplifier Apr 81 728 UHF TV antenna Mar 81 727 Antenna matcher Jan 81 726 6m and 10m power amplifier Feb 79 725 Polyphase SSB generator Aug 79 724 Microwave oven leak detector Jul 79 723 Selective caller Feb 82 722 Project 721 antenna May 79 721 Aircraft band converter Mar 79 720 2m VFET power amplifier Jan 79 719 Field strength meter Nov 78 718 SW receiver Oct 78 717 Cross hatch marker May 78 716 VHF Power amplifier Jan 78 715 Two and 6m power amplifier Nov 77 714 TV FM antenna Feb/Mar 713 Add on FM tuner Sep 77 712 CB power supply Jun 77 711 Remote control switch Jul/Aug/Sep 76 710 Power amplifier Apr 76 709 Attenuator Mar 76 708 Active antenna Mar 76 707 Converter for 28, 52 and 144MHz Feb 76 706 Marker generator Feb 76 705 Three simple receivers Dec 75 704 Cross hatch generator Aug 75 703 Antenna matcher Jun 75 702 Radar alarm May 75 701 Masthead amplifier Dec 74 699 300 baud modem May 85 698 Auto dialler for modem Jul 85 697 FORTH controller board Mar 86 696 RSC-FORTH card extension Dec 85 695 VZ-200 terminal Aug 85 694 FORTH computer May 85 693 Tape auto search Jun 85 692 RS232 to 29mA current loop Jan 85 690 Little big board Oct/Nov 83 689 Bus sharing switch Jan 86 688 Bipolar PROM programmer Jun 83 687 VZ-200 update Jul 86 686 PPI EPROM programmer Oct 82 685 2650 100 computer Dec 81 684 Intelligent modem Jun/Jul/Aug 86 684 Intelligent modem Dec 85, Feb/Mar 86 683 Computer controller Dec 84 682 S100 prom board Mar 81 681 Prog character generator Jun 80 680 280 CPU board Nov 79 679 'Bee joystick adaptor Jun 85 678 'Bee ROM reader Apr 84 677 Chatterbox voice synthesiser Jan 85 676 'Bee RS232 adaptor Feb 84 675 'Bee serial parallel interface Jan 84 674 'Bee joystick controller Dec 83 673 'Bee multiprom board Nov 83 672 'Bee teletype printer interface Oct 83 671 'Bee parallel printer interface Oct 83 670 ASCII keyboard May 82 669 EPROM eraser Jun 84 668 Errata for 668 upgrad Nov 88 668 Upgrade for 668 Sep 88 668 EPROM burner for Microbee Feb 83 667 Printer sharer Apr 85 666 Printer switch Feb 85 665 Computing routing switch Oct 85 664 Hobbybot robot Nov/Dec 85 662 6802 processor board Apr 84 661 Chord tutor adaptor for 660 Nov 84 660 1802 learner's microcomputer May/Jun/Oct/Nov 81 659 Vic 20 audio cassette interface May 84 658 RS232 breakout box Dec 83 654 Apple II card Mar 83 653 16 channel driver Nov 82 652 System 80 joystick interface Aug 82 651 Binary HEX trainer Jun 79 650 Stac timer Nov 78 649 Light pen for Microbee Aug 83 648 Micro grasp robot arm Apr/May 82 647 Turtle-talk voice synthesiser Sep/Oct 82 646 Turtle hand controller Jun 82 645 Tasman Turtle robot Apr/May/Jun 82 644a Modification Feb 84 644 Follow-up Nov 83 644 Modem Oct 82 643 S100 EPROM programmer Dec 79 642 RAM card 16K Feb 79 641 Philips printer interface S100 Sep 78 640 VDU Mk2 300 Apr/May/Jun 78 639 Doorbell Mar 78 638 2708 EPROM programmer Jul 78 637 Cassette interface Jan 78 636 S100 motherboard May 80 635 Micro power supply Sep 77 634 8080 EDU interface Aug 78 633 Video sync Jan 77 632 VDU Jan/Feb/Mar 77 631 ASCII keyboard Dec 76, Apr 77 630 HEX display Dec 76 617 Universal lead tester Apr 89 616 MIDI interface - Part II Feb 89 616 MIDI interfaces - Part I Jan 89 615 MIDI switch Nov/Dec 88 614 Patch bay Mar 88 613 MIDI interface for C64 Nov 87 612 Audio test set Aug 87 611 MIDI matrix Sep 86 610 Drum synth module Oct 74 609 MIDI thru box Mar 86 608 MIDI patch change May 87 607 Sound effects unit - Steam Whistle Aug/Sep 81, Mar 82 606 Tuning fork Nov 79 605 Lin-exp converter Sep 78 604 Metronome Sep 77 603 Sequencer Mk1 Aug 77 602 Mini organ Aug 76 601 Music synthesiser 3600/4600: 10/73<->7/74 Oct 73 599 Infrared remote controller Apr 81 598 Sequential touch switch Feb 81 597 Emergency light unit Dec 80 596 White noise generator Nov 81 595 Aquarium light timer May 79 594 Development timer Apr 79 593 colour sequencer Dec 78 592 Three channel light dimmer Aug 78 591 Four digit Up/down counter Jul 78 590 Six digit LCD stopwatch Oct 78 589 Temperature meter Dec 77 588 Dimmer - for stage and theatre Nov/Dec77, Jan/Mar78 587 UFO detector May 78 586 Shutter timer Oct 77 585 Ultrasonic beam switch Sep 77 583 Gas detector Aug 77 582 House alarm Mk3 Jul/Aug 77 --- 741 Cookbook Aug 77 581 15V power supply Jun 77 578 Simple NiCad charger Jun 80 577 Moving coil power supply (for 473) Oct 79 576 EMG (electromyagram) monitor -biofeedback Sep/Oct 79 575 Fluoro light wand Aug 79 574 Disco strobe Sep 79 573 Process timer Oct 79 572 pH meter Dec 80 570 Infrared trip relay Jan 82 569 Solar generator Dec 87 568 Sound and light operated flash Oct 80 567 Core balance relay Apr 80 566 Pipe and cable locator Apr 80 565 Laser Jul 80 564 Digital clock (large) Aug 80 563 Fast NiCad charger Jul 80 562 Geiger counter Apr 80 561 Metal detector - wind your own coil Mar 80 560 Mains cable seeker May 80 559 Cable tester Mar 79 558 Masthead flasher Feb 79 557 Reaction timer Feb 79 556 Windspeed Dec 78 555 Light activated tacho Nov 78 553 Tape slide synchroniser Oct 78 552 LED pendant Sep 78 551 Chaser Sep 78 550 AM digital dial Aug 78 549 Metal detector - induction balance May 77 548 High power strobe May 77 547 Bell extender (telephone) Jun 77 546 Bio resistance Mar 77 544 Heart rate monitor Sep 76 543 STD timer Jul 76 541 Train controller Mk1 Jun 76 540 Universal timer May 76 539 Touch switch Mar 76 538 Hornet power supply Mar 75 537 Low battery warning Feb 75 536 Low cost digital clock Jan 76 535 Swimming pool alarm Nov 76 534 Calculator stopwatch Jan 76 533 Three digit display Jul 75, Aug 76 532 Photo timer Jun 75 531 Coin collector Mk1 Dec 74 530 Temperature controller Oct 74 529 Poker machine May/Jun 75 528 House alarm Jan 75 527 Pushbutton dimmer Nov 74 526 Print timer Aug 74 525 Drill speed controller Oct 74 524 Laser Dec 73 521 Digital clock Jul 73, Mar 74 510 Digital stopwatch Oct 73 519 NiCad Feb 74 518 Door monitor Apr 73 517 Electronic decision maker Jan 73 516 12V fluorescent light Nov 71 515 Slave flash May 72 514B Versatile flash trigger May 76 514 Sound operated flash May 72 513 Tape slide synchroniser Apr 72 512 Photographic timer Mar 72 511 Battery savers Feb 72 510 Safety crossing Jan 72 509 50 day timer Dec 71 508 Fluoro light dimmer Oct 71 507 The farmer's problem Sep 71 506 Infrared alarm Sep 71 505 Hi-powered strobe Aug 71 504 Fastest finger Jul 71 503 Intruder alarm May/Jun 71 502 Emergency flash May 71 501 Soil moisture meter Apr 71 499 150W MOSFET PA amplifier Mar 82 498 PA system using the 499 Jun 82 497 Three way 4000/2 speakers Jun 80 496 Four way 4000/1 speakers Feb 80 495 Transmission Line (TL) speakers Aug 77 494 Loudspeaker protector Oct 82 492 Sound bender Feb 82 491 Simple graphic equaliser (4-band) Mar 79 490 Speech compressor Dec 78 489 Mk2 real time analyser Apr 78 488 60W nested differentiating feedback amp Jan 83 487 Real time audio analyser Feb 78 486 Frequency shifter Nov 77 485 New graphic equaliser with gyrator Jun 77 484 dBX Jul 77 483 Sound level meter Feb 78 482 50V stereo amplifier Jan/Feb 77 481 12V/100W amplifier Jun 77 480 50/100W amplifier (includes 480PS) Dec 76 479 Series 5000 stereo bridge adaptor Mar 82 478 Series 5000 stereo preamplifier Jul/Sep/Oct 81 477 Series 5000 power module Jan/Feb/Mar 81 476 Series 3000 amplifier `compact' Nov 80 475 AM tuner Aug 80 474 4000 power amplifier interface Feb 80 473 Moving coil amplifier Oct 79 472 Power supply Jul 80 471 Preamplifier: Series 4000 Jun 79 470 60W power amplifier module: Series 4000 May 79 470/1Series 4000 stereo amplifier (470 + 471) Jul 79 469 Drum machine (precision synth) Apr 82 467 Guitar/mic preamplifier for 466-4 Jul 80 466 300W amplifier Feb 80 465 Loudhailer using the 464 Jul 83 464 IC audio amplifier Jul 83 463 Masterplay two way speakers Oct 84 462 Headphone monitor/splitter Apr 84 461 Balanced input preamplifier Dec 82 459 Third octave graphic equaliser Nov 82 458 Peak/average LED level meter (5000 peamp) Jun 81 457 Scratch and rumble filter Sep 80 456 140V valve amplifier (The Rocker) May 80 455 Loudspeaker protection unit Mar 80 454 Fuzz board Apr 80 453 Class B amplifier Apr 80 452 Guitar practice amplifier Jan 80 451 50Hz/100Hz hum filter Jul 79 450 Bucket brigade Dec 77 449 Balanced mic Nov 76 448 Disco mixer Nov 76 447 Audio phaser Sep 76 446 Audio limiter Aug 76 445 Stereo preamplifier Jul 76 444 5W amplifier Jun 76 443 Expander compressor Apr 76 442 Masterplay stereo Sep 84 441 Noise generator Jan 76 440 25W amplifier Jul 75 439 Three way speakers Dec 75 438 Audio level meter Dec 75 437 Simple speaker Nov 75 436 Dynamic noise amplifier Sep 75 434 Two tape facility Oct 75 433 Active crossover Sep 75 432 Ceramic preamplifier Jun 75 431 FM antenna Apr 74 430 Line amplifier Mar 75 429 Colour organ Nov 74 428 Amplifier Dec 74 427 Graphic equaliser Oct 74 426 Rumble filter Oct 74 425 Integrated amplifier Jun-Sep/Dec 72 424 Spring reverb Sep 74 423 Add-on four channel amp Apr 74 422 50W stereo amplifier May/June 74, Oct 75 421 Low cost stereo speaker system Sep 83 420 Four channel amp Jan 74 419 Preamp Sep 73 418 Music synthesizer (see number 601) Oct 73 417 Over LED Aug 73 416 25W amp Jan/Jul 73 415 Quadraflex speakers Jan 73 414 Stage mixer Feb/Mar73, Mar/Apr75 413 100W guitar amp Dec 72, Sep 75 412 LED peak program meter Oct 83 411 Small speakers Aug 72 410 Super stereo May 72 409 TV sound Mar 72 408 Reverb unit Mar 72 407 Bass booster Dec 71 406 Single transistor radio Dec 71 405 Magna ray 8-30 Aug 71, Jul 72 404 FM conversion unit Apr 71 403 Guitar sound box Apr 71 402 Simple channel sound Apr/Aug 71 401 FET four channel mixer Jun 75 400 Speaker Jun 75 345 Demister timer Jun 86 344 Bike alarm May 88 343 Optical car alarm switch Sep/Oct 85 342 Pulse shaped CDI Feb/Mar 85 341 Electronic jumper leads Aug 85 340 Car alarm Apr 84 337 Auto car antenna driver Sep 84 336 Dwell meter Aug 83 335 Programmable wiper controller Mar 83 334 Auto tester Jan 83 333 Vehicle reversing alarm Jan 82 332 Engine stethoscope Aug 81 330 Car alarm Jul 81 329 Expanded scale car ammeter Feb 81 328 Oil temperature meter Jan 81 327 Hazard flasher Oct 80 326 Expanded LED voltmeter for cars Sep 80 325 Auto probe May 80 324 LED tacho Aug 80 323 Headlight delay May 83 322 Over-rev alarm Mar 80 321 Fuel level warning Jan 80 320 Battery indicator Apr 79 319 Variwiper Mk2 Sep 78 318 Tacho digital Jul 78 317 Tacho warning light Jul 77 316 Transistor ignition May 77 315 Solid state flasher Feb 75 314 Auto amp Feb 75 313 Car alarm Nov 74 312 CDI Dec 74, Jan 75 311 Tacho - timing light Sep 74 310 Ignition timing light Jun 74 309 Battery charger Aug 73 308 Turn indicator Feb 73 307 Headlight reminder Oct 72, Oct 74 305 Car alarm Jan 72 304 Light operated switch Nov 71 303 Brake light indicator Oct 71 302 Tacho/dwell meter Jul 71 301 Variwiper May 71 299 Voice operated relay May 89 294 Shock car alarm Mar 88 293 Dynamo back-up Mar 89 291 Telephone intercom Feb 88 290 Baby sitter Apr 88 289 Watch alarm in Coke tin Dec 87 288 Ring tone customiser Jun 87 287 LED light chaser Oct 87 286 Mutt minder (dog repeller, stop barking) Apr 87 285 Oscillators and amplifiers Mar 87 284 VCR alarm Nov 86 283 Lotto selector Dec 86 282 Telephone screamer Sep 86 281 Power supply Dec 86 280 Low battery voltage indicator Mar 85 279 Darkroom exposure meter Jan 85 278 Door minder Nov 84 277 Ready-set-go timer Oct 84 275 Bathroom heater timer Jun 84 274 Fast NiCad charger Feb 84 273 Let caller for tennis Jan 84 272 LED amp output indicator Nov 83 271 Solar intensity meter Dec 79 270 Solar powered radio Dec 79 268 NiCad float charger Mar 83 267 Voltage multiplying crystal set Dec 79 266 Crystal set Dec 79 265 Mains appliance timer Jul 83 264 Siren Mar 80 263 Egg timer Dec 79 262 Intercom Dec 79 261 Fog horn Dec 79 260 CMOS flasher Dec 79 259 Low cost timer Jan 81 258 Mini-drill speed controller Jul 81 257 Universal relay board May 81 256 Humidity metre/controller May 81 255 Temperature meter Nov 80 254 Egg timer Jun 79 253 Grenade/hot potato game May 79 252 Passionmeter Apr 85 251 Op-amp power supply Aug 85 250 House alarm Aug 80 249 Combination lock Apr 79 248 12V/22V converter Jul 78 247 Soil moisture indicator Nov 80 246 Rain alarm Apr 78 245 White line follower Nov 77 244 Car alarm Feb 77 243 Pip beacon Apr 77 242 Neo nim Aug 76 241 Electronic dice Jul 76 240 High power rescue signal (strobe flash) May 76 239 Breakdown beacon May 76 238 Headphone adaptor Dec 75 237 Loudness control May 75 236 Code practice oscillator Aug 75 235 Bicycle speedo Mar 75 234 Intercom Oct 74 233 Combination lock Oct 74 232 Courtesy light reminder Oct 74 231 Flip-flop flasher Jan 75 230 The family ferry Sep 74 229 Meter beater Nov 74 228 Pocket metronome Aug 74 227 Crystal radio May 74 226 Temperature meter May 74 225 Simple amplifier May 74 224 Temperature alarm May 74 223 Multi vibrator May 74 222 Transistor tester May 74 221 Basic power supply May 74 220 Wailing siren May 74 219 Hee-haw siren May 74 218 Mono organ May 74 217 12V power supply Feb 74 216 TV ghost eliminator Feb 74 215 Cyclone detector May 73 213 The revealer Jun 73 212 Earth resistivity meter May 73 211 Audio frequency meter May 73 210 Decision maker Jan 73 209 Meter mount Oct 72 208 Loudhailer Nov 71 207 Emergency lighting unit Oct 71 206 Audio visual metronome Oct 71 205 Doorbell Sep 71 204 Elapsed time indicator Aug 71 203 10c moisture meter Jun 71 202 Stereo balance meter May 71 201 Current limiter Apr 71 195 Universal troubleshooter Aug 89 191 Simple logic probe Apr 89 190 Transistor tester Mar 89 188 PCB exposure unit Jul 88 187 Protoboard Jun 88 186 Wide range AC voltmeter Mar/Apr 88 185 Versiply Feb 88 184 In-circuit IC tester Aug 87 183 Op amp tester Apr 85 182 Digital luxmeter Mar 85 181 RS232 breakout box Nov 87 180 Errata for 180 Mar 88 180 Solid state voltmeter Dec 87/Feb 88 179 Analog breadboard Aug 87 178 Analog capacitance meter Jul 87 177 Analog frequency meter Jun 87 176 Zener tester Sep 87 175 20MHz digital frequency meter Sep/Oct 86 174 Timebase standard Jul 86 173 Electro static hazard detector Jun 86 172 Bit pattern detector Apr 86 171 Arbitrary waveform generator Feb 86 170 CRO calibrator Feb 85 169 Low distortion oscillator Oct/Nov 85 168 Continuity tester Sep 85 166 Function generator Jul/Aug/Sep/Oct 83 165 Tacho calibrator May 82 164 Zener tester May 83 163 40V/5A power supply May/Jun 83 162 Modifications for 162 Jun 84 162 30V/1A power supply Dec 82 161 Digital panel meter Aug 82 160 13.8V/10A power supply Jul 82 159 10-15V expanded scale meter Dec 81 158 Low ohm meter Nov 81 157 Crystal marker Oct 81 156 100MHz high impedance probe Jun 81 155 4/8/16 ohm audio dummy load Jun 81 154 Digital logic pulser Jul 81 153 Temperature probe Jun 83 152 Capacitance meter Feb 80 151 Ohm meter Jan 80 150 Frequency meter Dec 79 149 Two tone tester Jul 80 148 Logic probe Jul 79 147 Electronic load Oct 80 146 Mains master Nov 79 145 Test board Jul 82 144 True RMS voltmeter Jun 79 143 Curve tracer Jan 79 142 Power supply Feb 79 141 Logic trigger Jan 79 140 1GHz frequency counter Mar/Apr 78 139 SWR meter May 78 138 Audio wattmeter Nov 78 137 Audio oscillator May 78 136 Linear scale panel meter Mar 78 135 Intersil panel meter Oct 77 134 RMS voltmeter Aug 77 133 Phase meter Apr 77 132 Power supply Feb 77 131 Power supply Apr 76 130 Temperature meter Feb 76 129 RF signal generator Jan 76 128 Audio mV meter Jan 76 127 TTL super test Feb 75 126 RF power control Jan 75 125 Oscillator Jun 75 124 Tone burst generator Nov 75 123 CMOS tester Nov 75 122 Logic tester Oct 75 121 Logic pulsar Sep 75 120 Logic probe Sep 75 119 Switching regulator Dec 75 118 Frequency meter Sep 75 117 Digital voltmeter Aug 75 116 Impedance meter Mar 75 115 Linear IC tester Aug 74 114 Dual beam adaptor Jul 74 113 Thermocouple meter Sep 73 112 Audio attenuator Mar 73 111 IC power supply Nov 72 110 FET voltmeter Oct 72 109 Digital frequency meter Sep 72 108 Decade resistance box Sep 72 107 Voltmeter Feb 72 106 CRO calibrator Feb 72 105 Dual power supply Nov 71 104 Soldering iron control Aug 71 103 Logic probe Jul 71 102 Audio signal generator Jun 71 101 Logic power supply Jun 71 084 Revised car alarm Oct 87 081 Tacho Mar 77 072 Two octave organ Jun 78 071 Tape noise limiter Jun 78 070 Tie breaker Jan 77 068 LED dice Oct 76 066 Temperature alarm Dec 76 064 Intercom Nov 76 062 Simple AM tuner Mar 77 061 Simple amp Oct 76 044 Doorbell Oct 76 043 Heads or Tails Oct 76