The LM555 is a highly stable device for generating accurate
time delays or oscillation. Additional terminals are provided
for triggering or resetting if desired. In the time delay mode of
operation, the time is precisely controlled by one external
resistor and capacitor. For astable operation as an oscillator,
the free running frequency and duty cycle are accurately
controlled with two external resistors and one capacitor. The
circuit may be triggered and reset on falling waveforms, and
the output circuit can source or sink up to 200mA or drive
TTL circuits.
www-micrel.deis.unibo.it
www.nxp.com
555 timer Mono stable (one shot) circuit
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Electronics Exercise 2: The 555 Timer and it’s applications
Objective:
1. Learn about the 555 timer integrated circuit and applications
2. Apply the 555 timer to build an infrared (IR) transmitter and reciever
www.me.gatech.edu
K85_1. 555 TIMER KIT
Circuit Descripion. The circuit consists of 3 parts: an
oscillator, a ripple counter and a switching transistor. The
555 is configured in the standard astable oscillator circuit
designed to give a square wave oscillation at a period of
around 1 cycle/sec. A potentiometer is included in the
design so the period can be set to exactly 1 second by
timing the LED turning on/off. A separate jumper
kitsrus.com
THE 555 TIMER AND ITS APPLICATIONS
Abstract. The 555 timer is one of the most useful electronic devices in the
market. The 555 timer was first introduced by Signetics but today it is man-
ufactured by nearly all semiconductor firms. The cost of this device is low
and it is widely available. The 555 timer has lots of uses such as: Mark Space
Adjustment, Pulse Width Modulation and Inductive Current Detection just
to name a few.
cng.ateneo.edu
The 555 timer: Waveform shaping
Oscillators are ubiquitous not only in research environments but also in our modern,
technology-oriented society. Oscillators are used for communication, timing in computers,precision measurements of physical quantities, and much more. In this course your primary oscillator has been the function generator. In addition, you have experimented with square-wave relaxation oscillators, a Wien-bridge sine-wave oscillator, and waveform synthesis using digital counters. For most applications it is neither economical nor practical to dedicate a function generator that costs roughly $1200. In these cases it is useful to produce your own specific oscillator or pulse generator from integrated circuits (ICs), resistors, and capacitors.
www.physics.udel.edu
LM555/NE555/SA555
Single Timer
www.fairchildsemi.com
GENERAL PURPOSE SINGLE BIPOLAR TIMERS
freespace.virgin.net
Timers are widely used in so many applications. Among such applications we mention
the most Popular applications: heaters, filters, pumps, fans, signs, blowers, indoor and outdoor lighting, feeders, security/alarm systems, watering systems, and process controls. Modern timers make use of the great development in digital electronics, and acquire so many features rather than absolute timing operations. Examples of such features are:
- High timing precision extending from µ seconds to several hours.
- Full programmability along day, week and even month.
- Possibility of repeat programs provide up to several switching
cycles per week.
- Low weight and low power consumption.
- Battery operation provides outdoor function.
- Simple and fast setting by means of push buttons and display prompts.
faculty.ksu.edu.sa
"Timing circuits with the 555 timer":
The purpose of this lab assignment is to examine operating principles and several practical applications of the 555 integrated-circuit timer. The 555 is capable of producing accurate time delays or oscillations.
These functions are needed in many analog, digital or mixed-signal applications. The circuits you design and test in this lab assignment will be applied as building blocks in the lab assignments that follow.
ece-www.colorado.edu
Relaxation Oscillator and One-Shot Using 555 Timer
In this experiment you will use an FET version of a 555 timer (TLC555) to
• make a relaxation oscillator (astable multivibrator)
• use the circuit with a thermistor as the timing resistor to make a digital thermometer of sorts (example of telemetry and analog-to-digital conversion) and
• make a one-shot circuit (monostable multivibrator or timer).
www.physics.ucdavis.edu
The 555 monolithic timing circuit is a highly stable controller capable
of producing accurate time delays, or oscillation. In the time delay
mode of operation, the time is precisely controlled by one external
resistor and capacitor . For a stable operation as an oscillator, the
free running frequency and the duty cycle are both accurately
controlled with two external resistors and one capacitor. The circuit
may be triggered and reset on falling waveforms, and the output
structure can source or sink up to 200mA.
www.create-online.net
A 555 Timer IC Tutorial
isa.umh.es
