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heat sensor with fan cooling using ic 741 pdf

Posted by:
Created at: Friday 16th of November 2012 01:22:43 AM
Last Edited Or Replied at :Monday 05th of October 2015 03:53:23 AM
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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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to study the working of 4–bit R–2R ladder, D/A converter circuit.
Apparatus – IC 741, circuit board, 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..................[:=> 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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. 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. Following figure shows how the output swings ..................[:=> Show Contents <=:]

Vertical Cooling Device Using Heat-Pipe Based on Natural Convection PowerKicker

Posted by: seminar class
Created at: Tuesday 03rd of May 2011 01:09:37 AM
Last Edited Or Replied at :Tuesday 03rd of May 2011 01:09:37 AM
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vironment preservation
such as ozone depletion and global warming because its
structure is such that heat-generating components are
directly immersed in an electrical-insulating cooling medium
such as CFCs or CFC substitutes consuming a large
amount of such a cooling medium.
On the other hand, horizontal cooling device using heatpipe
based on natural convection as shown in Photo 2
can, since it uses heat-pipes as a heat-radiating component
toward the fins, not only provide high thermal conductivity
due to the use of heat-pipes but also take global
environments into consideration due..................[:=> Show Contents <=:]


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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t pin 6.
Operational amplifier has a feedback from pin 6 to pin 2 which inverting input through a variable resistance R1 (100kΩ) which control the gain of operational amplifier. Resistance R6 is used if variable resistance is zero then IC can be damaged due to amplified signal so a small resistance is used.
Output signal of op amp is given to a combination of two transistors T1 548 (NPN) & T2 (PNP) which are working as push pull amplifier. The small amplified signal by op amp is working as input signal for push pull amplifier. Push pull amplifier amplify signal to a large value with low out..................[:=> 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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. Finger Print Based Voting M/C
106. Bidirectional Visitor Counter cum Power Management
107. Wireless Hovercraft
108. Implementation of image restoration.
109. Song Number Display
110. 4- Direction Obstacle /Object Detector & Multi Phonic Indicater for Blind
111. Implementation of color optimization.
112. Laptop Protector
113. Development Of Pc Based PWM For Dc Motor EWEED Control
114. Digital Code Lock.
115. Luggage Security System
116. With Wireless Camera
117. Implementation of visual cryptography using DH method.
118. Telephone Receiver
119. CDMA Transceiver
120. Clock..................[:=> Show Contents <=:]

Wireless RF Distribution in Buildings using Heating and Ventilation Ducts

Posted by: projects wizhard
Created at: Thursday 29th of July 2010 08:27:45 AM
Last Edited Or Replied at :Thursday 29th of July 2010 08:27:45 AM
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uilding is equipped with an RF waveguide distribution system—the HVAC ducts. The use of the HVAC ducts is also amenable to a systematic design procedure b..................[:=> 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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The circuit uses IC KT3170 (DTMF-to-BCD converter), 74154 (4-to-16-line demult-iplexer), and five CD4013 (D flip-flop) ICs. The working of the circuit is as follows.
Once a call is established (after hearing ring-back tone), dial ˜0™ in DTMF mode. IC1 decodes this as ˜1010,™ which is further demultiplexed by IC2 as output O10 (at pin 11) of IC2 (74154). The active low output of IC2, after inversion by an inverter gate of IC3 (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 ..................[:=> Show Contents <=:]

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