Casio KP-C10 - PC Tag Writer Especificaciones Pagina 132
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- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
CIRCUIT IDEAS
F
ig. 1 shows a muting circuit, which
makes use of IC LB1403. Sig-
nal from any pre-
amplifier, such as HA1032,
LA3161, or LA3160, is con-
nected to the base of am-
plifier transistor T1. Vari-
able resistor VR1 is used
to control the gain of in-
put signal.
Comparator 2 output
at pin 2 of LB1403 is used
for generation of muting
signal at the emitter (point
A) of transistor T2, which
can be directly connected
to muting pin 4 of ampli-
fier employing IC LA4440.
As long as the audio input
to the circuit of Fig. 1 is
below a certain level (say,
150 mV peak to peak), the output at point
A will be high (the value measured at
EFY Lab was around 4.5V). Once the in-
put crosses this threshold level, the out-
put will be around 0V. Capacitor C4 de-
termines the ‘on’/‘off’ muting delay.
Higher the value of this capacitor,
greater will be the muting delay period.
Slight circuit modification will be
needed if this circuit is used with STK
series amplifiers, such as STK 4141, 4142,
4152, and 4191, because they need nega-
tive polarity voltage for muting. The addi-
tional circuit to be connected at point A in
that case is shown in Fig. 2.
and then press switch S1. As a result,
buzzer PZ2 sounds. Simultaneously, the
side tone is heard in the speaker of hand-
set of phone 1. The person at phone 2
could then lift the handset and start con-
versation. Similar procedure is to be fol-
lowed for initiation of the conversation
from phone 2 using switch S2. In this
mode of operation, a 3-pole, 2-way slide-
switch S3 is to be used as shown in the
figure.
In the changeover mode of operation,
switch S3 is used to changeover the tele-
phone line for use by telephone 2. The
switch is normally in the intercom mode
and telephone 3 is connected to the ex-
change line. Before changing over the ex-
AUTOMATIC MUTING CIRCUIT
FOR AUDIO SYSTEMS
S.C. DWIVEDI
SUNISH P.
S.C. DWIVEDI
2-LINE INTERCOM-CUM-TELEPHONE
LINE CHANGEOVER CIRCUIT
J. SRINIVASAN
T
he circuit presented here can be
used for connecting two telephones
in parallel and also as a 2-line in-
tercom.
Usually a single telephone is con-
nected to a telephone line. If another tele-
phone is required at some distance, a par-
allel line is taken for connecting the other
telephone. In this simple parallel line op-
eration, the main problem is loss of pri-
vacy besides interference from the other
phone. This problem is obviated in the
circuit presented here.
Under normal condition, two tele-
phones (telephone 1 and 2) can be used
as intercom while telephone 3 is connected
to the lines from exchange. In changeover
mode, exchange line is disconnected from
telephone 3 and gets connected to tele-
phone 2.
For operation in intercom mode, one
has to just lift the handset of phone 1
132
- 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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