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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 :Friday 18th of July 2014 04:13:11 PM
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hello i want circuit dia..................[:=> 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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ohms when brightness illuminated.


COMPONENTS:
a) Battery: For 9v power supply we can use 6pcs dry cell or 6F22 9v single piece battery.
b) Switch: Any general purpose switch can be used. Switch is used as circuit breaker.
c) L.D.R :( Light Depending Resistance)
It is a special type of resistance whose value depends on the brightness of light which is falling on it. It has resistance of about 1mega ohm when in total darkness, but a resistance of only about 5k ohms when brightness illuminated. It responds to a large part of light spectrum.

d) L.E.D:
A diode is a ..................[:=> 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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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, t..................[:=> 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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re 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 IN/OUT INDICATOR
1057. AN ELECTRONIC ROULETTE
1058. ELECTRONIC VARIABLE RESISTOR
1059. SQUENTIAL LIGHT DISPLAY USING RELAYS
..................[:=> 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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tor inbuilt, which compares between
the input voltage from pin2 and 1/3rd of the power supply voltage
• When input falls below 1/3rd then output is set high otherwise
it is set low.
• Si..................[:=> 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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MAGIC EYE ALARM
Introduction

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 D..................[:=> 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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uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LED displays. The sequence is not really random because seven of the LEDs would normally be the display segments, the eighth LED is driven by an output that is normally used for driving further counters. The table below shows the sequence for the LEDs. You can use less than eight LEDs if you wish and the table may help you decide which ones to use for your purpose. Resistors are not required for the LEDs because the 4026 IC limits the current to about 5mA for each one.

Parts Required ¢ resistors: ..................[:=> 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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vel Alarm
Here is a simple circuit for Liquid level alarm. It is built Around two BC547 transistors(T1 and T2) and two timer 555 ICs (IC1and IC2). Both IC1 and IC2 are wired in astable multivibrator mode. TimerIC1 produces low frequency, while timer IC2 produces high frequency. As a result, a beeping tone is generated when the liquid tank is full. Initially, when the tank is empty, transistor T1 does not conduct. Consequently, transistor T2 conducts and pin 4 of IC1 is low. This low voltage disables IC1 and it does not oscillate. The low output of IC1 disables IC2and it does not oscillate. A..................[:=> Show Contents <=:]



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