JANUARY 1970
         METAL DETECTOR 24
HI FI STEREO AMPLIFIER 35
P.E. COMMUNICATIONS RECEIVER-4 46
P.E. ORGAN-9 52
EDUCATED EMMA 62
DEMONSTRATION SWITCHING CIRCUITS-2 42
SCHMITT TRIGGER 42, 66, 70
THYRISTORS AND THE EXPERIMENTER 18
POINTS ARISING 50
DOUBLE SIX
         
         FEBRUARY 1970
         RAINFALL GAUGE 116
P.E. ORGAN-IO 134
SOUND OPERATED SWITCH 138
P.E COMMUNICATIONS RECEIVER-5 144
BASIC RADAR PRINCIPLES-1 121
DEMONSTRATION SWITCHING CIRCUITS-3 150
MONOSTABLE MULTIVIBRATOR
CHESSBOARD COMPUTER 162
INGENUITY UNLIMITED 169
ADJUSTABLE LIGHT SOURCE
SCHMITT TRIGGER IMPROVED
LOGIC PROBE
         
         MARCH 1970
         50 PLUS 50 HIGH POWER AMPLIFIER-1 204
P.E. ORGAN-11 222
ELECTRONIC LOCK 236
P.E. COMMUNICATIONS RECEIVER-6 242
DUAL PURPOSE LOGIC GATE 253
BASIC RADAR PRINCIPLES-2 217
DEMONSTRATION SWITCHING CIRCUITS-4 226
ASTABLE MULTIVIBRATOR
FREQUENCY DIVIDER
VOLTAGE TO FREQUENCY CONVERTER 229
THE HUMAN EAR 232
         
         APRIL 1970
         MINIATURE 12 TO 240V DC CONVERTER 288
MAGIC EYE AUDIO SIGNAL INDICATOR 302
50 PLUS 50 HIGH POWER AMPLIFIER-2 318
P.E. COMMUNICATIONS RECEIVER-7 329
BASIC RADAR PRINCIPLES-3 292
DEMONSTRATION SWITCHING CIRCUITS-5 298
BISTABLE MULTIVIBRATOR
INGENUITY UNLIMITED 297
GUITAR PICK-UP SYSTEM
SOUND MIXER
THIS WAY TO ELECTRONICS FOR BEGINNERS 310
         
         MAY 1970
         MUSICAL STAVE 370
MARINE TACHOMETER 374
50 PLUS 50 HIGH POWER AMPLIFIER-3 400
CAR CONVERSION FOR TOWING 402
P.E. COMMUNICATIONS RECEIVER-8 413
DEMONSTRATION SWITCHING CIRCUITS-6 379
BINARY DIVIDER
SOUNDS INCREDIBLE 387
INGENUITY UNLIMITED 406
SPARK PLUG MONITOR
TREMOLO UNIT
THIS WAY TO ELECTRONICS-2 392
         
         JUNE 1970
         SOUND TRIGGER FOR PHOTO-FLASH 448
TRANSISTOR D.C. MULTIMETER-1 460
FLASHING LIGHT SHOW 474
MODEL TRAIN CONTROLLER 485
P.E. COMMUNICATIONS RECEIVER-9 490
DEMONSTRATION SWITCHING CIRCUITS-7 457
BCD COUNTER
SOUNDS INCREDIBLE 452
THIS WAY TO ELECTRONICS-3
TRIODE, TRANSISTOR, AMPLIFICATION, BIASING
         
         JULY 1970
         P.E. COMMUNICATIONS RECEIVER-1O 544
P.E. MARKSMAN 558
WAA WAA UNIT 568
TRANSISTOR D.C. MULTIMETER-2 573
MAKING THE MOST OF LOGIC l.C.s-1 530
INGENUITY UNLIMITED 539
CAR ALARM
TEMPERATURE ALARM
I.C. HOLDER
THIS WAY TO ELECTRONICS-4 552
PHASE SPLITTER, DARLINGTON PAIR
BOOTSTRAPPING, WAVEFORM GENERATORS
PULSE CIRCUITS, SAWTOOTH OSCILLATOR
SCHMITT TRIGGER, STAIRCASE GENERATOR
MONOSTABLE, BISTABLE MULTIVIBRATOR
ON THE FRINGE 557
THE BACKSTER EFFECT ESP IN PLANTS
BACTERIA THAT GLOW
ELECTROPLATING PLANT LEAVES
         
         AUGUST 1970
         ANEMOMETER 606
OSCILLOSCOPE CALIBRATOR 627
DECIMAL CURRENCY CONVERTER 638
TRANSISTOR D.C. MULTIMETER-3 649
MAKING THE MOST OF LOGIC I.C.s-2 643
ANALYTICAL ELECTRON MICROSCOPE 614
PROJECT BUILDING 620
METRONOME 622
THIS WAY TO ELECTRONICS-5 632
LIGHT SENSORS, LIGHT EMITTERS
HEAT SENSORS, HEAT EMITTERS
         
         SEPTEMBER 1970
         HUMIDISTAT 690
GUITAR PICK-UP 696
"VALSTAB" VALVE POWER SUPPLY 723
PHOTO TIMER 737
MAKING THE MOST OF LOGIC I.C.s-3 707
INGENUITY UNLIMITED 720
MODEL RAILWAY POINTS SWITCH
AUDIBLE CAR INDICATORS
THEATRICAL CUE LIGHT
MAINS LAMP FLASHER
ECONOMICAL I.C. HOLDER
400mW AMPLIFIER 712
THIS WAY TO ELECTRONICS-6 714
SOUND SENSORS, SOUND EMITTERS
MAGNETIC SENSORS, FIELD GENERATORS
MECHANICAL STRESS SENSORS
ON THE FRINGE 711
ANTIQUE RECORDINGS - SOUND ON POTTERY
TACTILE IMAGER FOR BLIND
UFO MAGNETISM DETECTOR
MULLARD ANTILOCK BRAKING 718
READOUT 742
TEMPERATURE ALARM CORRECTION
         
         OCTOBER 1970
         TELESCOPE TRACKER 770
LIGHT OPERATED SWITCH 775
PROTON MAGNETOMETER 782
TRIAC LAMP REGULATOR 810
MAKING THE MOST OF LOGIC I.C.s-4 818
AUDIOMETRY HEARING IMPAIRMENTS 804
INGENUITY UNLIMITED 825
MAGNETIC COMBINATION LOCK
MINI MOTOR DRIVEN OSCILLATOR
THERMISTOR THERMOMETER 794
THIS WAY TO ELECTRONICS-7 796
ELECTROMECHANICAL TRANSDUCERS
PARTICLE AND RADIATION SENSORS
THE SEMICONDUCTOR FAMILY
         
         NOVEMBER 1970
         "GEMINI" DUAL PURPOSE STEREO AMPLIFIER-1 860
RADIO CONTROL SEQUENCE SWITCH 870
BRAKE LIGHT REPEATER 874
"TRANSTAB" POWER SUPPLY 889
MAKING THE MOST OF LOGIC I.C.s-5 902
LOGIC GATE I.C. PINOUT DIAGRAMS
THE PROFESSIONAL FINISH 878
SIGNAL INJECTOR AND CODE PRACTICE OSCILLATOR 882
ON THE FRINGE 884
ELECTROSLEEP MULTIVIBRATOR EYELIDS
BRAKE FLUID LEVEL WARNING
         
         DECEMBER 1970
         P.E. DIGITAL CLOCK 950
THYRISTOR RELAY UNIT 961
"GEMINI" DUAL PURPOSE STEREO AMPLIFIER-2 969
FET TIME SWITCH 978
OPERATION SEASEARCH 982
ELECTRONIC DICE 997
MAKING THE MOST OF LOGIC IC's-6 990
THE PROFESSIONAL FINISH 958
INGENUITY UNLIMITED 1002
FUZZ CIRCUIT
METAL LOCATOR
POINTS ARISING 962
TRIAC LAMP REGULATOR
TRANSTAB POWER SUPPLY
INSTALLING AUDIO (SUPPLEMENT)

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