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astable multivibrator using ic 555 timer pdf


Posted by:
Created at: Monday 22nd of October 2012 07:01:28 AM
Last Edited Or Replied at :Wednesday 17th of April 2013 09:42:08 PM
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i need a r..................[:=> 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
automatic street light controller using 555 , automatic street light controller using ic 555, project report of automatic street light by using ic 555 , street light controller using 555, ic 555 as sreet light control project report , street light controller with ic555,

In other words, the triangle points toward that cathode. The anode is, of course, the opposite end. Current flows from the anode to the cathode. Light emitting diodes, or LEDs, differ from regular diodes in that when a voltage is applied, they emit light. This light can be red (most common), green, yellow, orange, blue (not very common), or infrared.
LEDs are used as indicators, transmitters, etc. Most likely, a LED will never burn out like a regular lamp will and requires many times less current. Because LEDs act like regular diodes and will form a short if connected between + and -, a cu..................[:=> 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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le, low-cost
components, and is easy to build
and install on the over-head
tank (OHT) to prevent wastage of
water.

The circuit works off a 12V battery
or 230V AC mains using a 12V
adaptor. The three sensors built
from non-corrosive metal are fitted
to the OHT as shown in Fig. 2 and
connected to the circuit (Fig. 1) at appropriate
terminals. Power supply tersors
in the OHT and connected the
power supply, the circuit is ready to
use.

Since Vcc terminal is at the bottom
of the tank, when the water level falls
below sensor L,
timer IC2 is
triggered at pin
2 via inverters
N..................[:=> 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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BICOLOUR LED FLASHER
962. SINGING BIRD BELL
963. 12-TUNE MUSICAL DOORBELL
964. QUARTZ WATCH TESTER
965. AUTOMATIC PORCH LIGHT
966. KNIGHT RIDER LIGHT
967. LOGIC NUMBER GAME
968. STEREO SIMULATOR
969. Simulation of chopper controlled separately excited DC motor
970. DIGITAL ELECTRONIC DIE
971. NEXTER
972. Design of visual cryptography for text image using MATLAB
973. FPGA Implementations of the Hummingbird Cryptographic Algorithm
974. MATCHING 8-OHM SPEAKER OUTPUT TO A HIGH IMPEDANCE AMPLIFIER
975. MULTIBEEPER
976. LOW COST TOUCH SENSITIVE SWITCH
977. FPGA Implementation of un..................[:=> 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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• Since in brightness, input voltage rises so we obtain no positive
voltage at output of pin 3 to drive relay or LED, besides in poor
light condition we get output to energize.
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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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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

Resistors : R1 - 2.2K
R2 - 100K
R3 - LDR
Capacitor : C1 - 0.02MFD
C2-0.1MFD
C3-22MFD 12V
IC : NE555 TIMER
Miscellaneous : Power supply
S..................[:=> 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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random manner. It 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 Requir..................[:=> 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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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. As a resul..................[:=> Show Contents <=:]



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