Electronics projects 2001.PDF

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EFY
PROJECTS
More than 90 fully tested
and ready-to-use
electronics circuits
2000
01
VOLUME
&
IDEAS
Electronics For You
issues
2001
Contents
JANUARY 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
2001
ELECTRONIC STARTER FOR SINGLE-PHASE MOTORS ------------------------------------------------------------- 7
MODEM 'ON'/'OFF' INDICATOR ------------------------------------------------------------------------------------- 8
TOUCH-SELECT AUDIO SOURCE ----------------------------------------------------------------------------------- 9
PRECISION ATTENUATOR WITH DIGITAL CONTROL -------------------------------------------------------------- 10
PRECISION AMPLIFIER WITH DIGITAL CONTROL ---------------------------------------------------------------- 11
RANDOM NUMBER GENERATOR BASED GAME ------------------------------------------------------------------- 12
CONSTRUCTION PROJECTS
1)
2)
FEBRUARY 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
9-LINE TELEPHONE SHARER ------------------------------------------------------------------------------------- 27
ELECTRONIC CARD LOCK SYSTEM -------------------------------------------------------------------------------- 28
PULSED OPERATION OF A CW LASER DIODE -------------------------------------------------------------------- 29
GENERATION OF 1-SEC. PULSES SPACED 5-SEC. APART -------------------------------------------------------- 31
HIGH-/LOW-VOLTAGE CUTOUT WITH TIMER --------------------------------------------------------------------- 32
BUILD YOUR OWN PENTIUM III PC (PART-I) ------------------------------------------------------------------- 14
AUTOMATIC ROOM LIGHT CONTROLLER -------------------------------------------------------------------------- 21
CONSTRUCTION PROJECTS
1)
2)
3)
MARCH 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
AUTOMATIC HEAT DETECTOR ------------------------------------------------------------------------------------- 48
MUSICAL 'TOUCH' BELL ------------------------------------------------------------------------------------------- 49
NON-CONTACT LIQUID-LEVEL CONTROLLER --------------------------------------------------------------------- 50
AC MAINS PHASE-SEQUENCE INDICATOR ------------------------------------------------------------------------ 52
HIGH-POWER BICYCLE HORN ------------------------------------------------------------------------------------ 54
LUXURIOUS TOILET/BATHROOM FACILITY ---------------------------------------------------------------------- 55
BUILD YOUR OWN PENTIUM III PC (PART-II) ------------------------------------------------------------------ 34
INTELLIGENT WATER LEVEL CONTROLLER ----------------------------------------------------------------------- 40
A UNIQUE LIQUID LEVEL INDICATOR ---------------------------------------------------------------------------- 43
CONSTRUCTION PROJECTS
1)
2)
APRIL 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
EEPROM W27C512 (WINBOND) ERASER ------------------------------------------------------------------------- 74
INTELLIGENT ELECTRONIC LOCK --------------------------------------------------------------------------------- 75
STABLE 455KHZ BFO FOR SSB RECEPTION ---------------------------------------------------------------------- 78
AUTO SHUT-OFF FOR CASSETTE PLAYERS AND AMPLIFIERS ---------------------------------------------------- 81
HOUSE SECURITY SYSTEM ---------------------------------------------------------------------------------------- 84
SIMPLE WATER-LEVEL INDICATOR-CUM-ALARM ----------------------------------------------------------------- 87
INTERFACE YOUR PRINTER WITH 8085 MICROPROCESSOR ---------------------------------------------------- 58
MORSE PROCESSOR ----------------------------------------------------------------------------------------------- 63
CONSTRUCTION PROJECTS
1)
2)
ACCESS-CONTROL SYSTEM ---------------------------------------------------------------------------------------- 90
TELEPHONE LINE-INTERFACED GENERIC SWITCHING SYSTEM (PART-I) --------------------------------------- 87
Contents
MAY 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
2001
PRECISION INDUCTANCE AND CAPACITANCE METER ------------------------------------------------------------ 93
UNDER-/OVER-VOLTAGE BEEP FOR MANUAL STABILISER ------------------------------------------------------ 95
ULTRA-SENSITIVE SOLIDSTATE CLAP SWITCH ------------------------------------------------------------------- 97
15-STEP DIGITAL POWER SUPPLY -------------------------------------------------------------------------------- 98
MICROPHONE FOR COMPUTER ----------------------------------------------------------------------------------- 100
CONSTRUCTION PROJECTS
1)
2)
JUNE 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
1)
2)
JULY 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
PC-BASED DIAL CLOCK-CUM-ELECTRONIC ROULETTE ---------------------------------------------------------- 136
SIMPLE TELEPHONE RING TONE GENERATOR ------------------------------------------------------------------- 138
DUAL-INPUT HIGH-FIDELITY AUDIO MIXER ------------------------------------------------------------------- 139
ANTI-THEFT SECURITY FOR CAR AUDIOS ----------------------------------------------------------------------- 140
UNIPOLAR/BIPOLAR TRIANGULAR AND BIPOLAR SQUARE WAVE GENERATOR ------------------------------ 141
VERSATILE ZENER DIODE TESTER ------------------------------------------------------------------------------- 117
DTMF PROXIMITY DETECTOR ------------------------------------------------------------------------------------- 119
STEPPER MOTOR CONTROL --------------------------------------------------------------------------------------- 120
LOW-COST INTERCOM -------------------------------------------------------------------------------------------- 121
HIGH-POWER CAR BATTERY ELIMINATOR ---------------------------------------------------------------------- 122
AUTOMATIC PLANT IRRIGATOR ---------------------------------------------------------------------------------- 123
PROGRAMMABLE MELODY GENERATOR (PART-II) -------------------------------------------------------------- 125
AUTO CONTROL FOR 3-PHASE MOTORS ------------------------------------------------------------------------- 129
PROGRAMMABLE MELODY GENERATOR (PART-I) --------------------------------------------------------------- 102
TELEPHONE LINE-INTERFACED GENERIC SWITCHED SYSTEM (PART-II) -------------------------------------- 110
CONSTRUCTION PROJECTS
CONSTRUCTION PROJECTS
1)
2)
AUGUST 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
LONG-RANGE CORDLESS BURGLAR ALARM --------------------------------------------------------------------- 153
WATER-LEVEL CONTROLLER -------------------------------------------------------------------------------------- 154
INVISIBLE BROKEN WIRE DETECTOR --------------------------------------------------------------------------- 156
PC-BASED MULTI-MODE LIGHT CHASER ------------------------------------------------------------------------ 157
FUSE STATUS INDICATORS FOR POWER-SUPPLIES ------------------------------------------------------------- 159
TELEPHONE REMOTE CONTROL ---------------------------------------------------------------------------------- 143
MICROCONTROLLER-BASED SCHOOL TIMER -------------------------------------------------------------------- 146
CONSTRUCTION PROJECTS
1)
2)
DIGITAL CAPACITANCE-CUM-FREQUENCY METER --------------------------------------------------------------- 162
FLUID-LEVEL CONTROLLER WITH INDICATOR ------------------------------------------------------------------ 166
SEPTEMBER 2001
CIRCUIT IDEAS
1)
A HIERARCHICAL PRIORITY ENCODER -------------------------------------------------------------------------- 171
Contents
2)
3)
4)
CONSTRUCTION PROJECTS
1)
2)
OCTOBER 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
DIGITAL MAINS VOLTAGE INDICATOR --------------------------------------------------------------------------- 173
ELECTRONIC DICE ------------------------------------------------------------------------------------------------ 175
LIGHT-OPERATED ORGAN ---------------------------------------------------------------------------------------- 177
2001
MGMA-A MIGHTY GADGET WITH MULTIPLE APPLICATIONS --------------------------------------------------- 179
TRAFFIC AND STREET LIGHT CONTROLLER --------------------------------------------------------------------- 183
DIGITAL FAN REGULATOR ---------------------------------------------------------------------------------------- 192
STEREO TAPE HEAD PREAMPLIFIER FOR PC SOUND CARD ---------------------------------------------------- 194
RUNNING LIGHTS AND RUNNING HOLES ----------------------------------------------------------------------- 195
HEART BEAT MONITOR ------------------------------------------------------------------------------------------- 197
12V, 3A POWER SUPPLY ----------------------------------------------------------------------------------------- 198
A SIMPLE TRANSISTOR TESTER --------------------------------------------------------------------------------- 199
CONSTRUCTION PROJECTS
1)
2)
NOVEMBER 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
SPELLER EFFECT SIGN DISPLAY --------------------------------------------------------------------------------- 210
DARKROOM TIMER ----------------------------------------------------------------------------------------------- 211
LONG-RANGE TARGET SHOOTER --------------------------------------------------------------------------------- 212
ACTIVE SHORTWAVE ANTENNA ---------------------------------------------------------------------------------- 214
POWER SUPPLY FOR WALKIE-TALKIE --------------------------------------------------------------------------- 215
HIGH-PERFORMANCE INTERRUPTION DETECTOR --------------------------------------------------------------- 216
LEAD-ACID BATTERY CHARGER WITH ACTIVE POWER CONTROL ---------------------------------------------- 201
MICROCONTROLLER-BASED DIGITAL CLOCK -------------------------------------------------------------------- 204
CONSTRUCTION PROJECTS
1)
2)
DECEMBER 2001
CIRCUIT IDEAS
1)
2)
3)
4)
5)
6)
DIGITAL RELAY TESTER FOR RAX AND MAX -------------------------------------------------------------------- 226
DECORATIVE SIGNBOARD ---------------------------------------------------------------------------------------- 228
OVERLOAD PROTECTOR WITH RESET BUTTON ------------------------------------------------------------------ 230
FASTEST FINGER FIRST INDICATOR ----------------------------------------------------------------------------- 231
CONDENSER MIC AUDIO AMPLIFIER ---------------------------------------------------------------------------- 232
SMOKE ALARM --------------------------------------------------------------------------------------------------- 233
AMPLITUDE MEASUREMET OF SUB-MICROSECOND PULSES --------------------------------------------------- 218
AUTOMATIC SUBMERSIBLE PUMP CONTROLLER ---------------------------------------------------------------- 221
CONSTRUCTION PROJECTS
1)
2)
TRANSISTOR CURVE TRACER ------------------------------------------------------------------------------------ 235
TRIPPING-SEQUENCE RECORDER-CUM-INDICATOR ------------------------------------------------------------- 241
January
2001

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