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sequential timer circuit using ic 555 in wikipedia


Posted by:
Created at: Sunday 28th of October 2012 10:40:56 AM
Last Edited Or Replied at :Sunday 28th of October 2012 10:40:56 AM
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hello i want circuit diagram and operation and abstract of sequential timer cir..................[:=> Show Contents <=:]



Using Energy Conversations Technique Automatic Street light control By IC555


Posted by: seminar paper
Created at: Thursday 08th of March 2012 03:44:18 AM
Last Edited Or Replied at :Thursday 08th of March 2012 03:44:18 AM
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darkness rises to a certain value then automatically street light is switched ON and when there is other source of light i.e. day time, the street light gets OFF.
The sensitiveness of the street light can also be adjusted. In our project we have used four L.E.D for indication of bulb but for high power switching one can connect Relay (electromagnetic switch) at the output of pin 3 of I.C 555. Then it will be possible to turn ON/OFF any electrical appliances connected all the way through relay.




Principle:

This circuit uses a popular timer I.C 555...................[:=> Show Contents <=:]



SIMPLE AUTOMATIC WATER-LEVEL CONTROLLER


Posted by: seminar addict
Created at: Monday 16th of January 2012 03:49:31 AM
Last Edited Or Replied at :Monday 20th of February 2012 04:47:56 AM
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goes
high. As a result,
the output
of timer IC2
goes high. Relay


energises and
the motor starts
filling water in
the tank. The
motor remains
‘on’ even when
the water level
crosses sensor

As water in
the tank rises to
touch sensor H, timer IC2 is retriggered
at pin 6 via inverters N3
and N4 and as a result, its output
goes low. The relay de-energises and
the motor stops filling water in the
tank. The motor remains ‘off’ even
when the water level falls below sensor

As water is consumed and its level
falls below sensor L, the motor restarts.
Thereafter, th..................[:=> Show Contents <=:]



a big electronics projects list for diploma or engineering students


Posted by: project topics
Created at: Sunday 08th of May 2011 12:22:24 PM
Last Edited Or Replied at :Friday 01st of July 2011 04:55:49 AM
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Implementation of Data Encryption Standard on ARM(ARM7TDMI) processor based microcontroller(LPC2148)
1045. Automatic Temperature based Fan Speed Controller
1046. ELECTRONIC CAPACITANCE METER
1047. MUSICAL DOORBELL CUM SIGNAL INJECTOR
1048. RANDOM RUNNING LAMPS
1049. Sub band coding of speech signal using MATLAB
1050. DC VOLTAGE LEVEL MONITOR INDICATOR
1051. SUBSTITUTE FOR BAR GRAPH IC
1052. Embedded Password based Access Control System using I2C protocol
1053. TELEPHONE AMPLIFIER USING IC 7000
1054. REGULATED POWER SUPPLY
1055. 100 WATT FREQUENCY CONTROLLED INVERTER
1056. MUSICAL I..................[:=> Show Contents <=:]



IC CONTROLLED STREET LIGHT


Posted by: seminar class
Created at: Saturday 23rd of April 2011 05:00:18 AM
Last Edited Or Replied at :Saturday 23rd of April 2011 05:00:18 AM
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implement it.
OBJECTIVES
1. To save the electric power.
2. To reduce the man power.
PRINCIPLE
It works under the principle , when the light falls on the LDR
depending upon the value of the resistance the light is turnedON and OFF.
ABSTRACT
• Needs no manual operation for switching.
• When there is a need of light it automatically detects that weather there is need of light or not.
• Light is switched OFF at night and ON at the morning hours.
LDR
• It is a special type of resistance whose value depends on the
..................[:=> Show Contents <=:]



MAGIC EYE ALARM


Posted by: seminar class
Created at: Friday 22nd of April 2011 11:27:43 PM
Last Edited Or Replied at :Thursday 20th of June 2013 12:17:18 AM
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tion
Electronic eye or magic eye has much use in this electronic age. Also known as magic eye. It can be used as an automatic guest indicator at the door, if fixed at the bottom of the door entrance. Once it is installed at the door there is no need to install a call bell. It can also be used at homes or in banks as a burglar alarm.
WORKING PRINCIPLE
principle of working mainly depends on the
LDR
LDR is a device which has a resistance which varies according to the amount of light falling on its surface
BLOCK DIAGRAM
CIRCUIT DIAGRAM
COMPONENTS

Resis..................[:=> Show Contents <=:]



Random Flasher for 8 LEDs Project


Posted by: project topics
Created at: Saturday 03rd of April 2010 10:58:22 AM
Last Edited Or Replied at :Saturday 03rd of April 2010 10:58:22 AM
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for the LEDs. You can use less than eight LEDs if you wish and the table may help you decide which ones to use ..................[:=> Show Contents <=:]



liquid level Alarm


Posted by: electronics seminars
Created at: Saturday 09th of January 2010 06:31:42 AM
Last Edited Or Replied at :Saturday 09th of January 2010 06:31:42 AM
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, transistor T2 is cut off and pin 4 ofIC1 becomes high. This high voltage enables IC1 and it oscillates to produce low frequencies at pin 3. This low-frequency output enables IC2 and it also oscillates to produce high frequencies. As a result, sound is produced from the speaker. Using preset VR1 you can control the volume of the sound from the speaker. The circuit can be powered from a9V battery or from mains by using a 9Vpower adaptor. Assemble the circuit on a general purpose PCB and enclose in a suitable cabinet. Install two water-level probes using metal strips such that one touches the b..................[:=> Show Contents <=:]



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