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Topic: Multivibrator

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  Astable Multivibrator
The prt of the input triggers must be shorter than the natural free-running prt of the astable multivibrator, or the trigger prf must be slightly higher than the free-running prf of the circuit.
The monostable multivibrator is basically used for pulse stretching.
The operation of the monostable multivibrator is relatively simple.
www.tpub.com /neets/book9/36a.htm   (1004 words)

  Monostable multivibrator and FM detector circuit employing common emitter transistor amplifier with plural emitter ...
A monostable multivibrator according to claim 1, wherein said amplifier circuit has a pair of output terminals connected to collectors of said pair of transistors, one of said output terminals is coupled to said positive feedback circuit while an output of said monostable multivibrator is derived from the other output terminal.
A monostable multivibrator according to claim 1, wherein a collector of said one transistor is coupled to said positive feedback circuit while an output of said monostable multivibrator is derived from a collector of said other transistor.
In the stable state of the monostable multivibrator circuit, the base-emitter path of a p-n-p transistor Q.sub.35 of the differentiator output clamp circuit 11 is forward-biased by a current from the resistor R.sub.26.
www.freepatentsonline.com /4282448.html   (3956 words)

  Encyclopedia :: encyclopedia : Multivibrator   (Site not responding. Last check: )
A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops.
Multivibrators find applications in a variety of systems where square waves or timed intervals are required, but the simple circuits tend to be fairly inaccurate, so are rarely used where precision is required.
An integrated circuit multivibrator, the 555, is very common in electronics.
www.hallencyclopedia.com /Multivibrator   (439 words)

 Monostable multivibrator block diagram
The schematic for a monostable multivibrator is shown in figure 3-11.
Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized.
Recall that when the astable multivibrator was first energized, it was impossible to predict which transistor would initially go to cutoff because of circuit symmetry.
www.tpub.com /neets/book9/36b.htm   (0 words)

 Monostable multivibrator   (Site not responding. Last check: )
These conventional multivibrator circuits are deficient in that the pulse width of the output pulse changes with the temperature.
The pulse width of the output pulse of the monostable multivibrators of FIGS.
Consequently, if the monostable multivibrator of the invention is applied to pulse count FM demodulation circuit, the variation in the DC detector output is minimized or prevented, thereby eliminating signal distortion due to incorrect tuning using the tuning meter.
www.sacnewsmonthly.com /invent/workbenches/monostable_multivibrator.html   (2224 words)

 United States Patent
The monostable multivibrator 21 establishes the width of the pulses in the stimulus channel 18 while the amplitude of those pulses is controlled through the variable resistor 22, the resulting pulse being transmitted as a stimulus signal by antenna 26, in known manner.
The output of the monostable multivibrator 98 is applied to the reset terminal of the counter 92, the counter 92 being reset on the leading edge of the signal from the monostable multivibrator 98.
While the astable multivibrator 93 remains enabled, during a pulse appearing at the data input terminal 68', its output is applied to the clock impulse input terminal of counter 94 causing the counter 94 to advance its state in response to each pulse from the astable multivibrator 93.
www.michael-robinett.com /private/128-419R.htm   (5589 words)

 Low volume flow meter - Patent 5218346
5 shows the logic cycling of the multivibrators in response to a normal flow situation as depicted by a given set of monitoring conditions and a specific periodic input for either the low flow circuit or the modified circuit.
The period of the first retriggerable mono-stable multivibrator system, 5, is adjusted using the potentiometer, 6, so that its logic output, Q, remains at a logic one as long as the pulse period as detected by the photo-Darlington detector, 4, is shorter than a set drop-out time, FIG.
In the circuit shown the retrigger period of the second multivibrator, 7, is set to 10 seconds which is considered to be essentially negligible flow.
www.freepatentsonline.com /5218346.html   (2827 words)

 Radio-Electronics.Com :: Operational Amplifier Multivibrator Oscillator
Multivibrator oscillators are used in many circuits and they are simple to construct.
Although many multivibrator circuits may be provided using simple logic gates, this circuit has the advantage that it can be used to provide an oscillator that will generate a much higher output than that which could come from a logic circuit running from a 5 volt supply.
In addition to this the multivibrator oscillator circuit is very simple, requiring just one operational amplifier (op amp), three resistors, and a single capacitor.
www.radio-electronics.com /info/circuits/opamp_multivibrator_oscillator/op_amp_multivibrator_oscillator.php   (324 words)

 Astable Multivibrators   (Site not responding. Last check: )
The oscillation frequency of the multivibrator is ~ 700 hertz and is set by the RC network formed by the 100K resistor and the 0.01 uF capacitor connected to each transistor base terminal.
The output of the multivibrator is buffered by the high input impedance of an emitter follower Q3.
As the multivibrator is buffered by 2 amplifier stages, good frequency stability is realized and frequency changes are negligable when turning the volume control pot.
www.qrp.pops.net /multivibrator.htm   (1981 words)

 The Flip Flop
The bi-stable Multivibrator circuit required an input pulse to the left side of the circuit and the load (say a globe) stayed ON when the signal was removed.
A free-running multivibrator is also called an astable multivibrator (meaning is has no stable states) and that is why it flips from one state to the other continuously.
The standard way to draw this type of multivibrator is to show the two capacitors crossing at the centre of the circuit, this also gives the circuit symmetry and makes it easy to recognise.
www.talkingelectronics.com /FreeProjects/5-Projects/Page16.html   (1856 words)

The bistable multivibrators are called flip-flops and are the basic memory devices used in sequential logic.
Other two-state devices include the astable multivibrator which serves as an oscillator and the monostable multivibrator ("one-shot" multivibrator) which can serve as a pulse source.
The configuration of NAND gate inverters shown is one of many ways to create an astable multivibrator : a two-state device which is not stable in either state.
hyperphysics.phy-astr.gsu.edu /hbase/electronic/flipflop.html   (230 words)

 4QD-TEC: Multivibrators and Relaxation Oscillator Circuits
Conventional multivibrators have only two stages and come in three flavours: astable (where neither state is stable and the circuit oscillates between the two states); monostable (where one state is stable, the other transient).
The 'astable multivibrator' (to give this circuit its 'proper' name was invented in the days of valves and was common with early germanium transistors.
These has a gain of maybe 20 (gain is the ratio of collector current to base current: feed 1 microamp into the base of a transistor and, with a gain of 20, you will get 20 microamps collector current).
www.4qdtec.com /mvibs.html   (1770 words)

 background   (Site not responding. Last check: )
An astable multivibrator is a circuit that has no stable operating state - it oscillates back and forth between RESET and SET states.
The duty cycle of an astable multivibrator is defined as the ratio
A bistable multivibrator is known as flip-flop because it has two stable states between which it switches.
physics.usask.ca /~angie/ep326/lab1/background.htm   (185 words)

 Clocks   (Site not responding. Last check: )
Another type of multivibrator is the astable type.
Astable multivibrator devices have no stable states, instead they continually switch between two unstable states.
The operation is similar to that of the one shot in its unstable state, but the two capacitive coupling networks prevents either inverter from having a stable state.
scitec.uwichill.edu.bb /cmp/online/P10F/clocks.htm   (92 words)

 Electronics 36
Astable, monostable and bistable circuits, Schmitt triggers and multivibrators, using tubes, transistors and integrated circuits.
The circuit was discovered in 1919 [Radio Review, 1, 143] as a development of the multivibrator, described the year before by H. Abraham and E. Bloch in Publication 27 of the French Ministère de la Guerre, and in Annales de Physique 12, 252 (1919).
Synchronization can also be obtained at multiples of the multivibrator's natural frequency, as well as with a string of pulses instead of a sine wave.
www.du.edu /~etuttle/electron/elect36.htm   (3301 words)

 Experiment 14: The 555 Astable Timer & the 74123 One-shot Multivibrator   (Site not responding. Last check: )
The 555 Timer is a versatile IC to use, because it acts as a clock whose duty cycle is governed by the external RC circuit that is built into it.
The 74123 Multivibrator is a versatile circuit for the same reasons as the 555 Timer, with the exception that its full cycle is not symmetrical; that is it is not a 50% duty cycle.
Depending on the needs of the designer, the multivibrator and the components chosen should be considered accordingly.
home.comcast.net /~erikcellis/Sourcefiles/Exp14.html   (524 words)

 Multivibrators - Basic Electronic Tutorials
One method of enabling a multivibrator circuit is called edge triggering, where the circuit's data inputs have control only during the time that the enable input is transitioning from one state to another.
We've already seen one example of a monostable multivibrator in use: the pulse detector used within the circuitry of flip-flops, to enable the latch portion for a brief time when the clock input signal transitions from either low to high or high to low.
One-shot multivibrators of both the retriggerable and nonretriggerable variety find wide application in industry for siren actuation and machine sequencing, where an intermittent input signal produces an output signal of a set time.
www.opamp-electronics.com /tutorials/digital_theory_ch_010.htm   (4954 words)

 ASTABLE MULTIVIBRATOR   (Site not responding. Last check: )
The purpose of this exercise is to build an astable multivibrator circuit using integrated circuit LM555 Timer.
Understand the function and the place of an astable multivibrator in transmitter circuits, determine its frequency and duty cycle is what we are going to do in this lab project The astable multivibrator will be a part of transmitter circuits which will be design and build in the next exercises.
To obtain the maximum duty cycle R1 must be as small as possible, but it must also be enough to limit the discharge current at pin "Dis" to the maximum rating of 200mA of the discharge transistor.
www.bergen.org /EST/Backup/electronic_projects/multivibrator.htm   (366 words)

 Light-emitting diode - Wikipedia, the free encyclopedia
These can be driven to different colors without reversing the polarity.
LED units may have an integrated multivibrator circuit that makes the LED flash.
LEDs can emit light of an intended color without the use of color filters that traditional lighting methods require.
en.wikipedia.org /wiki/LED   (4715 words)

The multivibrator itself is just two transistors, two resistors, and two cross-connecting capacitors.
Given the low oscillating frequency of this multivibrator circuit, you should be able to see the LED blink rapidly with the probe wire connected to the collector terminal of either multivibrator transistor.
You may notice that the LED fails to blink with its probe wire touching the base of either multivibrator transistor, yet the audio detector tells you there is an oscillating voltage there.
www.allaboutcircuits.com /vol_6/chpt_5/18.html   (0 words)

 FEEE - Fundamentals of Electrical Engineering and Electronics: Digital logic with feedback
There are also monostable multivibrators, which have only one stable output state (that other state being momentary), which we'll explore later; and astable multivibrators, which have no stable state (oscillating back and forth between an output of 0 and 1).
The astable multivibrator mentioned previously, with only one "vibrator," is more commonly implemented with multiple gates, as we'll see later.
The most interesting and widely used multivibrators are of the bistable variety, so we'll explore them in detail now.
www.vias.org /feee/multivib_02.html   (628 words)

 Radio-Electronics.Com :: Operational Amplifier Bistable MultivibratorCircuit
It is easy to use an operational amplifier as a bistable multivibrator.
To prevent small levels of noise triggering the circuit, hysteresis is introduced into the circuit, the level being dependent upon the application required.
The operational amplifier bistable multivibrator uses just five components, the operational amplifier, a capacitor and three resistors.
www.radio-electronics.com /info/circuits/opamp_bistable_multivibrator/op_amp_bistable_multivibrator.php   (306 words)

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