lesson 1456 experiment 2 - cleveland institute of electronics · 1/10/2012 · monostable...
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The Monostable Multivibrator
Lesson 1456 Experiment 2
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Monostable Operation
A timer IC produces a single
rectangular pulse of a specified or
particular pulse duration.
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Monostable Multivibrator
OA Monostable Multivibrator has
two states
O The first is the standby state,
which exists until the monostable
is triggered by a pulse on pin-2.
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OPin 2 must be brought low to
trigger the monostable
OThe second state is the duty
cycle in which the pin-3 output
is high.
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O Once the duty cycle is over,
the monostable goes back to
the standby state until the next
trigger pulse on pin-2.
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Things to note before constructing Figure 8
OYou will not be asked to measure
and compare the length of the
duty cycle with calculated values.
O This is due to the wide tolerances
of Electrolytic Capacitors.
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OElectrolytic Capacitors have a
tolerance on their marked values
which can range from -20%,
+80%.
O This means the capacitor you use
can have a value which is quite
different than the one we used
preparing the experiment.
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Monostable Multivibrator, Fig 8
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Discussion on Experiment 2
OYou will be changing the
values of RA and C1to help
you understand how the RC
time constant affects the
duty cycle of the monostable
multivibrator.
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OWhat is the Duty Cycle again?
O The time the output of the
monostable vibrator is high.
OFig 9 is a graph to help you
see RC combinations that will
cause specific time delays.
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Fig 9 Graph of RC Combinations
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OTo use the chart, simply
select the time delay
required; move up the graph
to the line that corresponds
to the resistor value you have
chosen; and then move to the
left to find the capacitor
value.
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Fig 9 Graph of RC Combinations
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Building your circuit
ORemember the basics
ORemember where Pin 1 and
8 are located on the IC
OCenter the IC on the divider
strip on the Breadboard
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OMake sure you do not short out
the component leads
OSpread your circuit out to make it
easier to follow the connections.
OUse different color jumpers for
the VCC and GND connections
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OMake sure you pay attention to component polarities
OElectrolytic capacitors have a polarity which you need to follow.
ODiodes have a polarity as well
OThe band is the cathode on a diode
OThe short lead or notch side on an LED is the cathode
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Monostable Multivibrator Built
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Monostable Multivibrator, Fig 8
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Close-up of Monostable Multivibrator
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Questions?
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The End
Developed and Produced by the Instructors in the CIE Instruction Department.
© Copyright 01/2012
All Rights Reserved / Jan. 2012