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simple circuits for intercom using 741 ic


Posted by:
Created at: Thursday 04th of October 2012 03:06:30 AM
Last Edited Or Replied at :Thursday 04th of October 2012 03:06:30 AM
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simple circuits for intercom using 741 ic


Posted by:
Created at: Thursday 04th of October 2012 03:06:30 AM
Last Edited Or Replied at :Thursday 04th of October 2012 03:06:30 AM
741 used as an intercomm, intercom using 741 ic , ic 741 working as intercom, simple projects using 741ic , simple projects using ic 741, projects using 741 , linear integrated circuits using 741ic, intercom circuit using ic 741 , linear integrated projects using741 ic, intercomm using lm741 , intercom using 741, 741 ic easy circuit project , 741ic using project, 741 intercom circuit , simple and easy projects using ic 741, intercom using ic 741 , simple circuits using ic 741, intercom circuit using ic 741 images , 741ic project circuit, simple intercom project using ic 741 , ic741 simple circuit,
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analog to digital converter circuit using ic 741


Posted by:
Created at: Wednesday 03rd of October 2012 10:41:31 AM
Last Edited Or Replied at :Wednesday 03rd of October 2012 10:41:31 AM
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how ..................[:=> Show Contents <=:]



Study the working of 4bit R2R ladder DA converter circuit


Posted by: seminar class
Created at: Friday 13th of May 2011 11:10:18 PM
Last Edited Or Replied at :Friday 13th of May 2011 11:10:18 PM
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ard, variable DC power supply, resistors, connecting wires, soldering iron, cutter etc.
Circuit diagram



Procedure –
1) Identify the given components.
2) Solder the circuit using the given components.
3) Connect power supply to the circuit.
4) Measure the analog output voltage (Va) w.r.t. ground for all binary inputs from 0000 to 1111.
5) Tabulate the results in observation table.
6) Plot the graph of analog output voltage versus digital inputs.


Brief theory – t..................[:=> Show Contents <=:]



Study the working of Schmitt trigger inverter as square wave generator


Posted by: seminar class
Created at: Friday 13th of May 2011 10:58:03 PM
Last Edited Or Replied at :Tuesday 02nd of October 2012 02:41:37 AM
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nd can be changed for adjusting the frequency. The diode in the circuit is used to rectify the AC signal, since negative voltages applied to the inputs of TTL ICs may damage them.
Schmitt trigger – it is a circuit, whose output changes state when the input is at specific threshold voltage levels. It is recognizable by the Hysteresis symbol on its logic symbol. For the Schmitt trigger inverter, when the input voltage reaches the upper threshold voltage (+Vsat) of +1.7V the output goes LOW. When the input voltage falls to the lower threshold voltage (–Vsat) of +0.9V, the output goes HIGH. ..................[:=> Show Contents <=:]



AUDIO AMPLIFIER full report


Posted by: seminar class
Created at: Friday 22nd of April 2011 06:20:00 AM
Last Edited Or Replied at :Friday 22nd of April 2011 06:20:00 AM
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amplifier
c) Push pull amplifier
d) Output Stage (Speaker)
First of all there is a condenser mike which is used to collect the audio signal (input signal) and to convert it into electrical signal. This electrical signal is goes to inverting input of the operational amplifier through a capacitor which is used to block the dc signal.
Second stage of audio amplifier is operational amplifier which is acting as summing amplifier and control the voltage of the signal. This is connected to Vcc as well as ground terminal of supply. This stage controls the level of voltage of input signal as well ..................[:=> Show Contents <=:]



main project topics for electronics and communication


Posted by: project topics
Created at: Wednesday 29th of December 2010 05:46:28 AM
Last Edited Or Replied at :Sunday 27th of March 2011 03:37:24 AM
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using Voice - Wired
73. Digital Audio - Video Input Selector
74. JPEG compression using DCT.
75. Triple Power Supply
76. Automatic Plant Irrigation System
77. Vehicle Pollution Alert System
78. Low cost PCO Billing meter
79. Line Follower Robot
80. Extension Phone Switcher
81. Wi-Fi Lan Controlled Robot With Robotic Arm
82. Crystal-Controlled Time-Base Generator
83. Energy Metering using GSM modem
84. Fire Fighting Robot with Fan as Extinguisher
85. Car Anti-theft Guard
86. Number Guessing Game
87. PC Based Single Channel Data Acquisition
88. Precison 1Hz Clock Generator Using..................[:=> Show Contents <=:]



Remote control using telephone


Posted by: computer science crazy
Created at: Wednesday 09th of September 2009 02:02:38 AM
Last Edited Or Replied at :Wednesday 09th of September 2009 02:24:07 AM
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CD4049), becomes logic 1. This is used to toggle flip-flop-1 (F/F-1) and relay RL1 is energised. Relay RL1 has two changeover contacts, RL1(a) and RL1(b). The energised RL1(a) contacts provide a 220-ohm loop across the telephone line while RL1(b) contacts inject a 10kHz tone on the line, which indicates to the caller that appliance mode has been selected. The 220-ohm loop on telephone line disconnects the ringer from the telephone line in the exchange. The line is now connected for appliance mode of operation.
If digit ˜0™ is not dialed (in DTMF) after establishing the call, the ring..................[:=> Show Contents <=:]



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