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	The 555 Timer IC (and the related 556 IC)
		The 555 timer integrated circuit is one of the most popular and useful integrated circuits of all time.
		A lengthy tutorial here on the 555 timer and how to use it would be a duplication of effort since at http://www.uoguelph.ca/~antoon/gadgets/555.htm there an excellent tutorial, which you should study to learn how this IC works.
		All of the timing calculations for circuits using the 555 timer are based on the response of a series R-C circuit with a step or constant voltage input, and exponential output taken across the capacitor.
	www.ecs.umass.edu /ece/ece211/lab/555.htm (948 words)

	555 timer IC - Wikipedia, the free encyclopedia
		The 555 is an integrated circuit (chip) implementing a variety of timer and multivibrator applications.
		The 555 timer is one of the most popular and versatile integrated circuits ever produced.
		Bistable mode: the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used.
	en.wikipedia.org /wiki/555_timer_IC (540 words)

	LM555 Timer Circuits
		Data sheets for the 555 Timer use the value 1.44 and 0.693 as constants in the timing calculations depending on the way in which the equation was written.
		It is a slave to the "A" timer.
		Depending on the particular IC used, the circuit can produce a duty cycle that is close to 50 percent but if the load on the output is increased the voltage drop across the timers output transistors will increase and the duty cycle will shift.
	home.cogeco.ca /~rpaisley4/LM555.html (4425 words)

	A 555 Timer IC Tutorial
		The 556 timer is a dual 555 version and comes in a 14-pin DIP package, the 558 is a quad version with four 555's also in a 14 pin DIP case.
		Thus, when the timer is driven in the monostable mode with input pulses longer than the desired output pulse width, the input trigger should effectively be shortened by differentiation.
		When the 555 timer is used in a voltage-controlled mode, its voltage-controlled operation ranges from about 1 volt less than V+ down to within 2 volts of ground (although this is not guaranteed).
	www.tel.uva.es /~tri/tutorial.htm (7660 words)

	[No title]
		The 555 timer IC is a highly versatile device for generating accurate time delay (ranging from microseconds to hours) or oscillations.
		IC 555 timer can be used with supply voltages in the range of +5V to +18V and can drive a load of upto 200mA (i.e., it is compatible with both Digital and Linear IC operating modes).
		Thus, when the timer is driven in the monostable mode with input pulses longer than the desired output pulse width, the input trigger should effectively be shortened by differentiation (simplest differentiator circuit is a high pass filter).
	members.lycos.co.uk /rsquare/viewthread.php?tid=12 (2168 words)

	555 Timer Calculator
		When the timer is operating in the astable or oscillating mode, this input could be used to alter or frequency modulate the output.
		For example, the two outputs for the two timers of the 556 are on pins 5 and 9 which correspond to the output pin 3 of the 555.
		Below is a pictorial view of the 555 timer wired as a LED flasher and powered with a 9 volt battery.
	ourworld.compuserve.com /homepages/Bill_Bowden/555.htm (1137 words)

	555 Timer/Oscillator Tutorial
		Supply-voltage operating range for the 555 is +4.5 volts (minimum) to +16 volts (maximum), and it is specified for operation between +5 volts and +15 volts.
		Additional components may have to be connected to the 555 to interface the device to external circuits or devices.
		The LED installed at the output of the 555 is used to monitor the output pulse.
	www.uoguelph.ca /~antoon/gadgets/555/555.html (8062 words)

	The 555 Timer IC
		The operation of the 555 timer revolves around the three resistors that form a voltage divider across the power supply, and the two comparators connected to this voltage divider.
		The three resistors in the voltage divider all have the same value (5K in the bipolar version of this IC), so the comparator reference voltages are 1/3 and 2/3 of the supply voltage, whatever that may be.
		One interesting and very useful feature of the 555 timer in either mode is that the timing interval for either charge or discharge is independent of the supply voltage, V
	www.play-hookey.com /digital/timer_555.html (1388 words)

	555 timer IC Information
		The 555 is an integrated circuit (chip) implementing a variety of timer and multivibrator applications.
		The 555 timer is one of the most popular and versatile integrated circuits ever produced.
		Bistable mode: the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used.
	www.bookrags.com /wiki/555_timer_IC (458 words)

	555 (number) - Wikipedia, the free encyclopedia
		555 is the natural number following 554 and preceding 556.
		The number of keyboard sonatas written by Domenico Scarlatti, according to the catalog by Ralph Kirkpatrick.
		The model number of the 555 timer IC, a classic integrated circuit (chip) implementing a variety of timer and multivibrator applications, and historically widely used in electronics.
	en.wikipedia.org /wiki/555_(number) (232 words)

	[No title] (Site not responding. Last check: )
		The proposed rodents deterrent is based upon the Type 555 timer chip, which is configure to produce a 20 to 50 kHz output signal, swept at a 50Hz rate.
		DC voltage produced is given to IC 555 timer which is connected in astable mode and produces a pulse at constant breaks continuously.
		IC 555 Timer connected in Astable condition works as explained on page 10 to give pulses at regular intervals continuously until the supply is on.
	www.ecsel.psu.edu /~mkk5001/Report.htm (1435 words)

	Interval Timer - Student's Guide
		The 555 timer is to be placed in the protoboard as shown in Figure 6.
		The pins on a new IC chip point out at a small angle, as shown in Figure 7(a) and have to be bent, as shown in Figure 7(b), before the chip can be placed into the protoboard.
		This can be done by placing the pins on one side of the IC on a flat surface, holding the ends of the chip and rotating the chip as shown in Figure 7(c) until the pins are in the proper direction.
	www.uml.edu /Dept/EE/EASNE/2s1.htm (1178 words)

	Parts explanation for 555 timer
		This is the IC which is often used as the IC for the timer.
		The 555 timer IC can pass an output current in a maximum of 200mA.
		In the case, a relay is put between output of 555 IC and grounding.
	www.piclist.com /images/www/hobby_elec/e_ckt4_3.htm (402 words)

	555 and 556 Timer Circuits
		The 8-pin 555 timer must be one of the most useful chips ever made and it is used in many projects.
		Low power versions of the 555 are made, such as the ICM7555, but these should only be used when specified (to increase battery life) because their maximum output current of about 20mA (with a 9V supply) is too low for many standard 555 circuits.
		The circuit symbol for a 555 (and 556) is a box with the pins arranged to suit the circuit diagram: for example 555 pin 8 at the top for the +Vs supply, 555 pin 3 output on the right.
	www.kpsec.freeuk.com /555timer.htm (2388 words)

	Webtech Students' Page - Safety Light System
		The 555 timer IC was first introduced around 1971 by the Signetics Corporation as the SE555/NE555 and was called the "IC Time Machine".
		A monostable timer is a one-stable timer; that is, it returns to its original (stable) state (off) after a certain period of time.
		The 555 timer chip uses two external components, a resistor (R1) and a capacitor (C1), which act together to form a circuit that times the monostable pulse.
	www.eng.buffalo.edu /shaw/student/m1_safety/01_home/ksb/ksb3/ksb3_timer.htm (501 words)

	555 timer IC - Definition, explanation
		The 555 is an integrated circuit (chip) implementing a variety of timer and multivibrator applications.
		The 555 timer is one of the most popular and versatile integrated circuits ever produced.
		Bistable mode: the 555 can operate as a flip flop, if the DIS pin is not connected and no capacitor is used.
	www.calsky.com /lexikon/en/txt/5/55/555_timer_ic.php (503 words)

	555tutorial
		If this is allowed to happen, the timer will retrigger itself upon termination of the first output pulse.
		Supply-voltage operating range for the 555 is +4.5 volts (minimum) to +16 volts (maximum), and it is specified for operation between +5 volts and + 15 volts.
		Intersil's ICM7555 model is a low-power, general purpose CMOS design version of the standard 555, also with a direct pin-for-pin compatibility with the regular 555.
	www.hamradioindia.com /HRI-THEOR/General/555tutorial.htm (5114 words)

	Silicon Chip Online - A New 555 Timer IC
		Fig.1: this is the standard circuit for a monostable using a 555.
		The success of the 555 can be attributed to its flexibility, performance and its ability to satisfy the timing requirements of a huge number of applications.
		The new 555 timer from Zetex takes the performance to the next level – operation from a single cell, guaranteed operation down to 0.9V and bipolar technology.
	www.siliconchip.com.au /cms/A_102000/article.html (232 words)

	555 and 556 Timer IC circuit design software from Schematica
		555 Timer PRO provides an array of design wizards, circuit blocks and information panels that facilitate the use of the 555 timer.
		555 Timer PRO and 555 Timer Lite (freeware) are combined in the same application.
		The Lite mode offers astable and monostable calculators as well as other useful 555 timer information, and can be used indefinitely.
	www.schematica.com /555_Timer_design/555_Timer_PRO.htm (351 words)

	555 ic timer - Get them here
		555 ic timer is safe through Invisible Clock.
		555 ic timer is fast through Invisible Clock.
		Countdown Timer - set this function to alert once or to repeat itself, vibrating or beeping at any interval you choose for as long as you like.
	www.countdown-timer-clock.com /timer/555_ic_timer (145 words)

	The 555 Timer Kit - Oscillators and Pulses
		The 555 integrated circuit (IC) is designed so that when the input changes, the output goes from 0 volts to Vcc (where Vcc is the voltage of the power supply).
		The way the 555 timer works is that when you flip the first switch, the Output pin goes to Vcc (the positive power supply voltage) and starts charging the capacitor.
		You should be able to trigger the 555 again by touching the wire connected to pin 2 with your finger or by connecting it to ground and removing it.
	www.iguanalabs.com /555kit.htm (2228 words)

	TALKING ELECTRONICS 555 Page1
		The 555 IC is one of the simplest and most rugged IC's on the market.
		The 555 is a very noisy chip and has a very nasty internal feature called "crow-bar effect" that can put a lot of noise on the power rails of a circuit.
		When the timer is used in monostable mode with trigger pulses longer than the output pulse, the trigger duration must be shortened by external circuitry.
	www.talkingelectronics.com /FreeProjects/555/555-P1.html (3118 words)

	NE 555 Tutorials page
		It was called "The Ubiquitous Timer chip" and was also the very first very mass-produced commercially produced timer IC available at that time.The designers had no real idea what product life it would have, nor how brilliantly successful it would be, lasting well over 25 years still in mass-production today.
		This article is about this fantastic little timer IC which is, after 25 years still very popular today and used in many schematics.
		This timer uses about 25 transistors to perform the tasks and is coupled with various diodes and resistors all on the NE-555's substrate "die" to do their bit in switching and timing and for this task with the minimum of components.
	www.unitechelectronics.com /NE-555.htm (8890 words)

	555 timer
		The 555 timer is an extremely versatile integrated circuit which can be used to build lots of different circuits.
		With a little practice, it is quite easy to choose appropriate values for a 555 timer astable.
		This version of the 555 astable is used in the cyclist/pedestrian safety lights project.
	www.doctronics.co.uk /555.htm (1888 words)

	ePanorama.net :: View topic - U6046B Timer IC
		Posted: Mon Nov 06, 2006 9:47 am Post subject: U6046B Timer IC
		timer uses with a low external parts count.
		Posted: Mon Nov 06, 2006 6:18 pm Post subject: Re: U6046B Timer IC
	www.epanorama.net /phpBB2/viewtopic.php?p=269860 (481 words)

	Oral History Hans Camenzind Historic 555 Integrated Circuit Index
		Without a doubt, however, it is Hans’s design work on the 555 integrated circuit in the early 1970s that has ensured him a prominent position in the history of IC technology.
		If you are or have been a practicing electrical engineer anytime in the last 40 years, then most likely you have used the 555 timer/oscillator chip in your designs.
		Since the introduction of the 555 by Signetics in 1972, this integrated circuit has outsold all other IC types by a wide margin, with over 1 billion units sold worldwide in 2003 alone.
	semiconductormuseum.com /Transistors/LectureHall/Camenzind/Camenzind_Index.htm (0 words)

	Touch Switch And Delay Circuit Using 555 Timer IC
		In this simple touch switch circuit, the 555 timer is configured as a one shot multivibrator that is triggered by touching the touch terminal.
		When the trigger pulse voltage applied to the #2 pin falls below Vcc/3 while the timer output is low, the timer's internal flip-flop turns the discharging Tr.
		The output from the 555 timer can be used to drive a transistor which in turn can drive a delay to control device like lamp, and other equipments.
	www.electronics-project-design.com /TouchSwitch.html (312 words)

	Counters and Timer Circuits - Electronic Projects & Circuits
		BCD COUNTER: This is based around two ic’s the 4029 an up down counter and the 4543 a latched bcd to 7 segment driver it is very cheap to build with many uses.
		Design low duty cycle timer circuits: 08/22/2002 EDN - Design Ideas / Designing astable circuits using the industry-standard 555 timer is a straightforward process when duty cycles are 50% or greater.
		Use a 555 timer as a switch mode power supply: 11/14/2002 EDN - Design Ideas / Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback.
	www.hobbyprojects.com /C/Counters_and_Timer_Circuits.html (2037 words)

	The 555 Timer - Electronics in Meccano
		The 555 relies on both analogue and digital electronic techniques to perform its functions, but if we consider its output only, it can be thought of as a digital device.
		The output of the 555 can be in one of two states at any time, which means it is a digital output.
		Pin 5 can be used to alter the timing aspect of the 555 IC in applications such as frequency modulation.
	www.eleinmec.com /article.asp?1 (1315 words)

	555 Timer
		This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker.
		A 555 timer can be used to generate a squarewave to produce a negative voltage relative to the negative battery terminal.
		The timing sequence is generated using a CMOS 4017 decade counter and a 555 timer.
	ourworld.compuserve.com /homepages/Bill_Bowden/page10.htm (1565 words)

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