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JANUARY 1969
METAL LOCATOR 16
SQUARE WAVE OSCILLATOR 24
SONIC FISH BAIT 38
STABILISED POWER SUPPLY 42
BIONICS-3 30
ZENER DIODES 50
PROBING THE OCEAN-1 54
INGENUITY UNLIMITED 66
SUPPRESSED ZERO CAR VOLTMETER
POINTS ARISING 36
LIGHT OPERATED SWITCH
VARI WINDSCREEN WIPER
BBC EXPERIMENTAL SOUND-IN-VISION 37
FEBRUARY 1969
BRAKEMETER 96
HARMONAPHONE 107
FENCER UNIT 120
MINIATURE NICAD BATTERY CHARGER 137
RAIN DETECTOR LAUNDRY PROTECTOR 145
BIONICS-4 128
OPTICAL COMMUNICATION USING LASER DIODES 102
PROBING THE OCEAN-2 116
AMORPHOUS SEMICONDUCTOR DEVICES 124
MARCH 1969
PHOTOGRAPHIC TIMER 176
BINARY ADDER 187
ELECTRONIC MIME MOBILE ANIMAL EMMA-1 196
KNITTING MACHINE ALARM 204
SOUND OPERATED SWITCH 207
BIONICS-5 212
MODERN AUDIO CIRCUITS 179
RIAA AMP, BAXENDALL, BUFFER, VARI-GAIN
APOLLO-8 182
INGENUITY UNLIMITED 192
SIMPLER FLIP-FLOP GAME
SOUND EFFECTS ATTACK AND DECAY
OPTICAL COMMUNICATIONS LINK
FROST WARNING
ELECTRONIC VIDEO RECORDING 210
POINTS ARISING 209
VARI WINDSCREEN WIPER
METAL LOCATOR
AMPLIFIER CSW RMS WATTS RATING 226
APRIL 1969
MICROPHONE MIXER 259
PHASE SPLITTER- FREQUENCY DOUBLER 267
POCKET RADIATION MONITOR 270
ELECTRONIC MIME MOBILE ANIMAL EMMA-1 275
INTERRUPTED SCREENWIPER CONTROL 281
BlONlCS-6 294
THEORY INTO PRACTICE 256
TRANSISTOR AUDIO SPEAKER AMPLIFIER
LOUDSPEAKERS 286
CONSTRUCTORS GUIDE SUPPLEMENT 280
LIGHT OPERATED SWITCH
GOONHILLY 284
MAY 1969
INFRA RED BURGLAR ALARM 336
P.E. ORGAN-1 356
VERY HIGH IMPEDANCE AMPLIFIER 366
TONE FILTER FOR RADIO CONTROL 381
COLD CATHODE TUBES-1 343
CHOOSING AND USING A MULTIMETER 350
ELECTRONIC SPIROGRAPH PATTERNS 369
INGENUITY UNLIMITED 377
TRANSISTOR GAIN CHECKER
STOCKMARKET GAME
I.C. HOLDER
JUNE 1969
STROBOSCOPE 416
LINEAR SCALE OHMMETER 427
P.E. ORGAN-2 440
PHOTOGRAPHIC ENLARGER EXPOSURE METER 450
OPERATIONAL AMPLIFIERS-1 421
COLD CATHODE TUBES-2 435
OPTICAL CHARACTER RECOGNITION 454
AN INTERNATIONAL TECHNICAL LANGUAGE 461
INGENUITY UNLIMITED 465
LAMP TRIGGER
TIME SWITCH
BASS MAKER FREQUENCY DIVIDER
POINTS ARISING 458
POCKET RADIATION MONITOR
DC FEEDBACK PAIR
ELECTRONIC SPIROGRAPH
JULY 1969
OPTICAL REMOTE CONTROLLER 494
P.E. ORGAN-3 508
SERIES VOLTAGE REGULATOR 521
CHROMATONE SOUND OPERATED LIGHTS 535
COLD CATHODE TUBES-3 514
OPERATIONAL AMPLIFIERS-2 527
INGENUITY UNLIMITED 505
GUITAR TREBLE BOOSTER
VARIABLE WAA-WAA
ELECTRONIC CANDLE
OSCILLOSCOPE PREAMPLIFIER
PRINTED CIRCUITS METHOD
SPACEWATCH 502
APOLLO II
AUGUST 1969
SPRING LINE REVERBERATION UNIT 566
R.F. WATTMETER 580
SPLIT PHASE CONDUCTIVITY BRIDGE 587
P.E. ORGAN-4 596
OPERATIONAL AMPLIFIERS-3 608
ELECTRONICS FOR THE BOAT OWNER 572
SPACEWATCH 579
APOLLO II
COMPONENTS 582
POINTS ARISING 586
POCKET RADIATION MONITOR
PHOTOGRAPHIC TIMER
OSCILLOSCOPE PREAMPLIFIER
SEPTEMBER 1969
ANALOGUE SERVO SYSTEM 642
CINE-TAPE SYNCHRONISER 660
P.E. ORGAN-5 668
INSULATION AND DIODE TEST SET 675
MODEL RAILWAY LOGIC SYSTEMS-1 652
COLD CATHODE TUBES-4 685
INGENUITY UNLIMITED 656
STOCKS AND SHARES IMPROVEMENT
ELECTRONIC DICE
UNIJUNCTION SUBSTITUTE
LIGHT METER
OCTOBER 1969
AUDIO SIGNAL GENERATOR 722
P.E. COMMUNICATIONS RECEIVER-1 734
P.E. ORGAN-6 746
PHOTO-ELECTRIC PARKING LIGHT 762
MODEL RAILWAY LOGIC SYSTEMS-2 756
COLD CATHODE TUBES-5 766
CIR-KIT STICK-ON WIRING 728
I.C. AUDIO AMPLIFIERS 741
NOVEMBER 1969
I.C. BASIC AMPLIFIER 810
I.C. STEREO AMPLIFIER 812
P.E. ORGAN-7 830
P. E. COMMUNICATIONS RECEIVER-2 838
TIME LAPSE CINE 844
MODEL RAILWAY LOGIC SYSTEMS-3 818
COLD CATHODE TUBE6-6 858
CONDUCTIVE GLASS 853
AUDIO SUPPLEMENT 836A
SPACEWATCH 837
MOON ROCK RESULTS
MARS MARINER
DECEMBER 1969
HI Fl STEREO AMPLIFIER 900 DOUBLE SIX 924
P.E. ORGAN-8 932 CAR FLASHER 941
P.E. COMMUNICATIONS RECEIVER-3 949
MODEL RAILWAY LOGIC SYSTEMS-4 913
DEMONSTRATION SWITCHING CIRCUITS-1 918
INGENUITY UNLIMITED 954
Logical state indicator
Rape stop-foil device
EDITORIAL 899
MARKET PLACE 909
SPACEWATCH 917
R.S.G.B. EXHIBITION 923
ELECTRONORAMA 930
NEWS BRIEFS 938, 945
DUTCH FIRATO-69
EXHIBITION 946 | ||
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