555 timer ic The 555 Timer IC is an integrated circuit (chip) implementing a variety of timer and multivibrator applications. The IC was designed by Hans R. Camenzind in 1970 and brought to market in 1971 by Signetics (later acquired by Philips). The original name was the SE555 (metal can)/NE555 (plastic DIP) and the part was described as "The IC Time Machine".[1] It has been claimed that the 555 gets its name from the three 5 eke resistors used in typical early implementations
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1 Smoke Detector ∗ Sardar Nimisha Sankhe∗ ‚ Nisarg Vinod† and Ekta Vira Patel Institute of Technology‚ Mumbai-400058‚ India‚ nimisha.sankhe@yahoo.com † Sardar Patel Institute of Technology‚ Mumbai-400058‚ India‚ naughty.nisarg@yahoo.co.in ‡ Sardar Patel Institute of Technology‚ Mumbai-400058‚ India‚ ekta vira@ymail.com Abstract Most of the smoke alarms available in the market use one or another kind of smoke sensor which increases the cost and also require complicated interfacing circuitry
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Brake lights flasher circuits This circuit will allow the brake light was flashing. The default behavior. When the power supply to the circuit‚ Or tap the brake it. The IC timer IC2 drive current to transistor Q2 and producing oscillator output‚ pulse signal output at pin 3 to input pin 1 of IC1-CD4024. Count pulse and stops counting after 8 pulses‚ with pin 2 of IC1 is reset. The transistor Q1 will trigger the IC2‚ and pin 3 of IC2 change status as well. The voltage drop across R3‚ the voltage
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CD4013 dual-D flip-flop ICs. The clock pins of the four flip-flops are connected to that specified sequence of digits‚ which is the correct code sequence to unlock the system. The circuit also contains (555) timer IC to lock automatically after certain period of time. Discussion Equipments Used * SPST switches. * CD4013 Dual-D flip-flop ICs. * 74LS147 Decimal to BCD Encoder. * 74LS47 BCD-to-7-Segment Decoder IC. * 7-Segment Display. * 555 timer IC. * Relay. * 12V
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References: * http://www.aaroncake.net/circuits/Electronic_Dice_Circuit.asp * http://www.kpsec.freeuk.com/projects/dice.htm * http://clarkson-uk.com/555-timer/projects/dice.html
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4017B pin connections The 4017 available from Rapid Online decade counter has ten outputs which go HIGH in sequence when a source of pulses is connected to the CLOCK input and when suitable logic levels are applied to the RESET and ENABLE inputs. 2. What is a decade counter? The counting action of the 4017 can be understood from the graph below: Just one of the individual outputs is HIGH at a time. This is quite different from the behaviour of a BCD counter like the 4510 in which it is the combination
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ELECTRONICS LOCK A Report of the project for the fulfillment of the requirement of NIRMAAN (Electronic Hardware Model Exhibition) Sankalp-2009 Submitted By PRAGNYASINI PANIGRAHI (EIE) 200860192 SIBANI SAIDARSANI (ECE) 200860316 ANKITA PANIGRAHI (EIE) 200810202 Organized By Electronics Hobby Club‚ NIST |[pic] |[pic]
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Visitor counting is simply a measurement of the visitor traffic entering and exiting offices‚ malls‚ sports venues‚ etc. Counting the visitors helps to maximize the efficiency and effectiveness of employees‚ floor area and sales potential of an organization .Visitor counting is not limited to the entry/exit point of a company but has a wide range of applications that provide information to management on the volume and flow of people throughout a location. A primary method for counting the visitors
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activates the beeper when the fuel tank is almost empty. Its point A is connected to the input terminal of the fuel meter and point B is connected to the body of the vehicle. The circuit consists of an op-amp IC CA3140 (IC1)‚ two 555 timer ICs (IC2 and IC3) and decade counter CD4017 (IC4). Op-amp IC CA3140 is wired as a voltage comparator. Its inverting input (pin 2) receives a reference voltage controlled through VR1. The noninverting input (pin 3) receives a variable voltage tapped from the input terminal
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Alcohol breathalyzer circuit using 8051 microcontroller. Three digit display 1 of 9 http://www.circuitstoday.com/breathalyzer-circuit-using-8051 Home Forums Datasheets Lab Manual Testing Components Buy Project Kits Custom Search admin June - 5 - 2013 0 Comments Alcohol Breathalyzer circuit using 8051 microcontroller (AT89S51). This article is about a breathalyzer circuit using 8051 microcontroller which outputs the blood alcohol content (BAC) from the breath. The BAC is displayed in percentage
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