JANUARY 1971
         SONIC OBSTACLE LOCATOR-1 22
WASH-WIPE CONTROL 40
"P.E. GEMINI" DUAL PURPOSE STEREO AMPLIFIER-3 48
P.E. DIGITAL CLOCK-2 58
MAKING THE MOST OF LOGIC I.C.s-7 35
BIAS IN TAPE RECORDING 44
SIREN 30
ON THE FRINGE 73
TRANSMITTING THROUGH WATER
WALKING MACHINES
TEXT TO SPEECH
         
         FEBRUARY 1971
         TAPE/SLIDE SYNCHRONISER 110
"P.E. GEMINI" DUAL PURPOSE STEREO AMPLIFIER-4 116
SUBMARINE CHASER GAME 130
SONIC OBSTACLE LOCATOR-2 140
P.E. DIGITAL CLOCK-3 153
MAKING THE MOST OF LOGIC I.C.s-8 125
WOMEN IN ELECTRONICS 136
         
         MARCH 1971
         AUTOCHECKLIGHT 198
MULTI-FUNCTION LOGIC CIRCUIT 202
"P.E. GEMINI" DUAL PURPOSE STEREO AMPLIFIER-5 206
P.E. DIGITAL CLOCK-4 216
MAKING THE MOST OF LOGIC I.C.s-9 228
INGENUITY UNLIMITED 226
FUSE FAIL INDICATOR
LINEAR SCALE OHMMETER
POWER CONTROL WITH TRIACS 237
SIMPLE REFLEX RECEIVER 222
ON THE FRINGE
MAGNETIC FIELD AFFECTS HUMANS
PSYCHOSENSITIVE PLANTS
ESTIMATING TIME
FUZZ IMPROVEMENT 249
         
         APRIL 1971
         P.E. AURORA-1 286
TOUCH SWITCH 293
BOAT SPEED INDICATOR 310
DOOR YODELLER 322
MAKING THE MOST OF LOGIC I.C.s-10 326
CROWBAR PROTECTION CIRCUITS 296
DESIGN OF OHMMETERS 301
INGENUITY UNLIMITED 316
DIGITAL DICE
DIGITAL TO ANALOGUE CONVERSION
TRINITRON TUBE DEVELOPMENT 325
ELECTRICAL STUFF IN FRANCE 337
         
         MAY 1971
         FISH BITE ALARM 382
DIGITAL I.C. TESTER 386
P.E. AURORA-2 400
WINDSCREEN WASHER TIMER 417
MAKING THE MOST OF LOGIC I.C.s-11 378
TREMULANT SYSTEMS 372
INGENUITY UNLIMITED 410
SIMPLE METRONOME/TUNING FORK
AUDIO CHOPPER/EFFECTS UNIT
VOICE OPERATED SWITCH FET VOX 398
ON THE FRINGE 413
MOTORISED MUSIC MAKER
POINTS ARISING 422
P.E. GEMINI AMPLIFIER
         
         JUNE 1971
         AUTO BATTERY CHARGER 468
XEE ELECTRONIC ANIMAL-1 484
P.E. AURORA-3 497
WIND DIRECTION INDICATOR 509
RADIO ASTRONOMY TECHNIQUES-1 462
TREMULANT SYSTEMS 477
         
         JULY 1971
         P.E. AURORA 550
VOLTAGE STABILISER 564
XEE ELECTRONIC ANIMAL-2 568
THE PIPSQUEAK POROSITY DETECTOR 576
RADIO ASTRONOMY TECHNIQUES-2 586
INGENUITY UNLIMITED 560
TEMPERATURE CONTROLLER
POWER SUPPLY CUT-OUT
SIMPLE INTERCOM 546
         
         AUGUST 1971
         WAR GAMES COMPUTER 624
VOLTAGE STABILISER 633
P.E. AURORA 638
SEISMOGRAPH-1 646
RADIO ASTRONOMY TECHNIQUES-3 658
COMPONENTS SHOW 669
SPACEWATCH 637
MARINER 8 LOSS AND MARINER 9
         
         SEPTEMBER 1971
         BURST-FIRE THYRISTOR SCR POWER CONTROLLER 710
TIMER WITH DIGITAL READOUT 722
SEISMOGRAPH-2 736
WAR GAMES COMPUTER-1 748
RADIO ASTRONOMY TECHNIQUES-4 730
AERIAL DESIGN
BALUN CONSTRUCTION
MICROWAVE SEMICONDUCTORS 716
SPACEWATCH 757
MARINER 9
         
         OCTOBER 1971
         ENGINE TEMPERATURE CONTROLLER 798
WAR GAMES COMPUTER-2 810
RAIN AND WATER LEVEL ALARM 820
SERVO CHART RECORDER 822
RADIO ASTRONOMY TECHNIQUES-5 830
ELECTRONIC MUSIC SYNTHESIS 802
INGENUITY UNLIMITED 843
ORGAN DIVIDER CIRCUIT
TIME SWITCH
CRYSTAL CLOCK OSCILLATOR
         
         NOVEMBER 1971
         RHYTHMETRON DRUM SYNTHESISER 890
WAR GAMES COMPUTER-3 902
P.E. SCORPIO ELECTRONIC IGNITION-1 910
PROJECTOR LAMP PROTECTOR 924
RADIO ASTRONOMY TECHNIQUES-6 930
INTRODUCTION TO LOUDSPEAKERS 895
INGENUITY UNLIMITED 926
IC TEST JIG
LIFT-NOTE GENERATOR
DIGITAL CLOCK MODIFICATION
SUBSTITUTES FOR ZENERS-1 918
         
         DECEMBER 1971
         LOGICAL RADIO CONTROL 982
P.E. SCORPIO ELECTRONIC IGNITION-2 998
I.C. DIGITAL DICE 1004
LABPACK POWER SUPPLY 1018
RADIO ASTRONOMY TECHNIQUES-7 1009
ELECTROLUMINESCENCE 989
SUBSTITUTES FOR ZENERS-2 1030
LINEAR AND LOGIC IC LIST 1008

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