Casio KP-C10 - PC Tag Writer Especificaciones Pagina 101
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- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
CIRCUIT
IDEAS
S.C. DWIVEDI
C.K. SUNITH
T
he circuit described her is dif-
ferent form conventional door
bell circuits in the sense that it
can produce two different tones-one of
a lower frequency and the other of a
much higher frequency.
The circuit uses a timer IC 555,
which has been wired in free-running
mode. When switch S1 is depressed, the
circuit oscillates at around 1.5 kHz, re-
sulting in a higher frequency note. When
switch S2 is depressed, transistor T1 is
turned 'on' and thus it shunts resistor
R2 across capacitor C2. As a result, the
circuit now oscillates at approximately
150 Hz and a tone of much lower fre-
quency is generated.
The circuit can be conveniently em-
ployed as a doorbell for two separate
doors at the same floor level. Doorbell
switches S1 and S2 can be mounted
near the re-spective doors.
The circuit can be assembled on a
general-purpose PCB and housed inside
a small cabinet. Tone can be adjusted
with the help of preset VR1. Before
power is switched 'on' , it is advisable
to adjust VR1 to approximately 5 kilo-
ohm, that is, at the centre of the full
range of potentiometer VR1. A trimpot
can be used as VR1 for convenience of
assembly.
PRADEEP G.
A
major drawback of some pest
repellers is that their power out-
put is low and hence their effec-
tiveness suffers. The pest repeller cir-
cuit described here generates powerful
ultrasonic signals to repel pests. In ad-
dition to the ultrasonic frequency oscil-
lator, separate push-pull power ampli-
fier and transformer are used to boost
ultrasonic signals.
Ultrasonic frequency oscillator is
built around IC CD4047, which provides
complementary outputs. These comple-
mentary outputs are amplified by tran-
sistors T1 and T2 (BD139) to drive
transistorised push-pull power amplifier
stage comprising power transistors T3
and T4 (2N3055).
The output of the power amplifier is
coupled to a tweeter, through output
SWG while secondary winding comprises
40 turns of 24 SWG wire. Adjust potenti-
ometer VR1 for maximum effectiveness.
S.C. DWIVEDI
transformer X1. Transformer X1 is wound
over ferrite core (UU or CC core). Pri-
mary winding consists of 150 turns of 28
2
101
- PROJECTS 1
- Contents 2
- MICROPROCESSOR-CONTROLLED 6
- TRANSISTOR LEAD IDENTIFIER 6
- The circuit 8
- Fig. 5 (v) 10
- Fig. 5 (iv) 10
- CONVERSION OF AUDIO CD PLAYER 14
- TO VIDEO CD PLAYER I 14
- TO VIDEO CD PLAYER II 15
- ) is the 17
- ) is forward bi 18
- ). While adjusting potmeter 18
- AUTOMATIC BATHROOM LIGHT 19
- AUTOMATIC SCHOOL 21
- BELL SYSTEM 21
- DESIGNING AN RF PROBE 23
- February 24
- PC BASED SPEED 25
- MONITORING SYSTEM 25
- STEREO CASSETTE PLAYER 30
- Fig. 3: Internal schematic 31
- Assembly 34
- BASS AND TREBLE FOR 35
- STEREO SYSTEM 35
- PROTECTION FOR YOUR 35
- ELECTRICAL APPLIANCES 35
- DIGITAL WATER LEVEL METER 36
- UNIVERSAL HIGH-RESISTANCE 37
- VOLTMETER 37
- Pk-To-Pk 38
- RESONANCE TYPE L-C METER 41
- Description 42
- Construction 43
- Calibration 44
- Limitations 44
- ELECTROLYSIS-PROOF COMPLETE 45
- WATER-LEVEL SOLUTION 45
- Precautions 48
- PENDULUM DISPLAY 49
- AUDIO LEVEL INDICATOR 49
- CLEVER RAIN-ALARM 51
- PRAVINCHANDRA B. MEHTA 53
- SIMPLE AND ECONOMIC SINGLE 53
- PHASING PREVENTOR 53
- SMART CLAP SWITCH 56
- ELECTRONIC VOTING MACHINE 59
- Software description 61
- Password security 63
- Software Listings 63
- WATER-TANK LEVEL METER 65
- PHONE BROADCASTER 66
- ANJAN NANDI 66
- TELEPHONE CALL METER USING 67
- CALCULATOR AND COB 67
- SIMPLE ELECTRONIC 68
- CODE LOCK 68
- LATCH-UP ALARM 69
- USING OPTO-COUPLER 69
- MINI VOICE-PROCESSOR 69
- DIGITAL NUMBER 72
- SHOOTING GAME 72
- Parallel port 76
- Program Listing 77
- STEPPER MOTOR DRIVER 82
- ADITYA U. RANE 83
- ELECTRONIC DIGITAL 83
- TACHOMETER 83
- LIGHT-OPERATED LIGHT 84
- PRECISION DIGITAL AC POWER 85
- CONTROLLER 85
- PORTABLE OZONE GENERATOR 88
- The circuit 90
- Metering circuit 90
- Fig. 6: LED indicator 91
- CONFERENCE TIMER 94
- ADD-ON STEREO CHANNEL 97
- SELECTOR 97
- WATER TEMPERATURE 98
- EMERGENCY LIGHT 99
- RAJESH KAMBOJ 99
- CIRCUIT IDEAS 100
- C.K. SUNITH 101
- PRADEEP G 101
- BUILD YOUR OWN C-BAND 103
- SATELLITE TV RECEIVER 103
- CONSTRUCTION 104
- EPROM-BASED PROGRAMMABLE 110
- NUMBER LOCK 110
- Operation 111
- POWER-SUPPLY FAILURE ALARM 113
- STOPWATCH USING 113
- COB AND CALCULATOR 113
- ELECTRONIC DANCING PEACOCK 115
- INVERTER OVERLOAD PROTECTOR 116
- WITH DELAYED AUTO RESET 116
- TELEPHONE LINE BASED AUDIO 117
- MUTING AND LIGHT-ON CIRCUIT 117
- (HARDWARE AND SOFTWARE) 120
- Address Data Comments 122
- 10 64 B4 LS Byte of Address 122
- 10 E4 04 MS Byte of Address 122
- PC based design 123
- PARTS LIST 126
- To be continued next month 126
- 8085 µP-KIT BASED 127
- SIMPLE IC TESTER 127
- LOW-COST PCO BILLING METER 131
- AUTOMATIC MUTING CIRCUIT 132
- FOR AUDIO SYSTEMS 132
- S.C. DWIVEDI 133
- THOMAS SEBASTIAN 133
- RUPANJANA 134
- RADIO-BAND-POSITION DISPLAY 134
- M.K. CHANDRA MOULEESWARAN 134
- September 135
- PART II 136
- Basic principles 138
- Testing the board 140
- Conclusion 140
- DIGITAL CODE LOCK 146
- Operational 147
- BINARY TO DOTMATRIX DISPLAY 150
- DECODER/DRIVER 150
- TABLE III 151
- AUTOMATIC SPEED-CONTROLLER 152
- FOR FANS AND COOLERS 152
- ONE BUTTON FOR STEP, RUN 155
- AND HALT COMMANDS 155
- MOSFET-BASED 50Hz 157
- SINEWAVE UPS-CUM-EPS 157
- R-2R D/A CONVERTER-BASED 164
- FUNCTION GENERATOR USING 164
- PIC16C84 MICROCONTROLLER 164
- Application 166
- Software 167
- CIRCUIT IDEAS 169
- TOILET INDICATOR 169
- SIMPLE SWITCH MODE 169
- POWER SUPPLY 169
- FEATHER-TOUCH 170
- SWITCHES FOR MAINS 170
- DIGITAL FAN REGULATOR 171
- TELEPHONE RINGER 173
- USING TIMER ICs 173
- November 174
- PC-TO-PC COMMUNICATION 175
- USING INFRARED/LASER BEAM 175
- MULTI-EFFECT CHASER LIGHTS 181
- USING 8051 MICROCONTROLLER 181
- Hardware 182
- AUTOMATIC BATTERY CHARGER 185
- TEMPERATURE MEASUREMENT 186
- INSTRUMENT 186
- VOICE BELL 187
- MUKESH KUMAR SONI 187
- K.P. VISWANATHAN 188
- MOVING CURTAIN DISPLAY 188
- PROXIMITY DETECTOR 189
- K.S. SANKAR 189
- December 190
- ELECTRONIC BELL 191
- Fig. 6: Component layout 194
- SIMPLE TELEPHONE RECORDING/ 195
- ANSWERING MACHINE 195
- Important points 197
- MULTICHANNEL CONTROL 199
- USING SOFT SWITCHES 199
- GENERATOR 200
- AN EXCLUSIVE SINEWAVE 200
- TTL THREE-STATE LOGIC PROBE 201
- AM DSB TRANSMITTER 201
- FOR HAMS 201
- STEPPER MOTOR CONTROL 203
- VIA PARALLEL PORT 203
- DOS PROGRAM 204
- LINUX PROGRAM 204
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