Specifications

2000
Contents
MAY 2000
CONSTRUCTION PROJECTS
1) DIGITAL NUMBER SHOOTING GAME --------------------------------------------------------------------------------- 63
2) PC INTERFACED AUDIO PLAYBACK DEVICE: M-PLAYER ---------------------------------------------------------- 66
CIRCUIT IDEAS
1) STEPPER MOTOR DRIVER ------------------------------------------------------------------------------------------------- 73
2) ELECTRONIC DIGITAL TACHOMETER ---------------------------------------------------------------------------------- 74
3) LIGHT-OPERATED LIGHT SWITCH --------------------------------------------------------------------------------------- 75
4) PRECISION DIGITAL AC POWER CONTROLLER ---------------------------------------------------------------------- 76
5) LUGGAGE SECURITY SYSTEM ------------------------------------------------------------------------------------------- 77
JUNE 2000
CONSTRUCTION PROJECTS
1) PORTABLE OZONE GENERATOR ---------------------------------------------------------------------------------------- 78
2) CONFERENCE TIMER -------------------------------------------------------------------------------------------------------84
CIRCUIT IDEAS
1) ADD-ON STEREO CHANNEL SELECTOR ------------------------------------------------------------------------------- 87
2) WATER TEMPERATURE CONTROLLER --------------------------------------------------------------------------------- 88
3) EMERGENCY LIGHT -------------------------------------------------------------------------------------------------------- 89
4) PARALLEL TELEPHONES WITH SECRECY ------------------------------------------------------------------------------90
5) TWO-DOOR DOORBELL ---------------------------------------------------------------------------------------------------91
6) POWERFUL PEST REPELLER ---------------------------------------------------------------------------------------------- 91
JULY 2000
CONSTRUCTION PROJECTS
1) BUILD YOUR OWN C-BAND SATELLITE TV-RECEIVER ------------------------------------------------------------- 92
2) EPROM-BASED PROGRAMMABLE NUMBER LOCK ---------------------------------------------------------------- 99
CIRCUIT IDEAS
1) POWER-SUPPLY FAILURE ALARM ------------------------------------------------------------------------------------- 102
2) STOPWATCH USING COB AND CALCULATOR --------------------------------------------------------------------- 102
3) DIAL A VOLTAGE ---------------------------------------------------------------------------------------------------------- 103
4) ELECTRONIC DANCING PEACOCK ------------------------------------------------------------------------------------ 104
5) INVERTER OVERLOAD PROTECTOR WITH DELAYED AUTO RESET ------------------------------------------- 105
6) TELEPHONE LINE BASED AUDIO MUTING AND LIGHT-ON CIRCUIT ---------------------------------------- 106
AUGUST 2000
CONSTRUCTION PROJECTS
1) DISPLAY SCHEMES FOR INDIAN LANGUAGESPART I (Hardware and Software) -------------------- 108
2) 8085 µP-KIT BASED SIMPLE IC TESTER ----------------------------------------------------------------------------- 115
CIRCUIT IDEAS
1) LOW COST PCO BILLING METER ------------------------------------------------------------------------------------- 119
2) AUTOMATIC MUTING CIRCUIT FOR AUDIO SYSTEMS ---------------------------------------------------------- 120
3) 2-LINE INTERCOM-CUM-TELEPHONE LINE CHANGEOVER CIRCUIT ----------------------------------------- 120
4) GUARD FOR REFRIGERATORS AND AIR-CONDITIONERS ------------------------------------------------------- 121
5) RADIO BAND POSITION DISPLAY ------------------------------------------------------------------------------------- 122