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has-courseware |
170044 |
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url |
holdingsInfo?bibId=170044 |
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isAbout |
model |
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isAbout |
drift |
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isAbout |
linearity |
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isAbout |
capstan |
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isAbout |
differential amplifier |
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isAbout |
mechanical example |
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isAbout |
motor drive |
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isAbout |
torque amplifier |
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isAbout |
transistor amplifier |
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Contributor |
bdafc65fe8b2cd06cd2290a310c07aa1 |
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Table Of Contents |
David Crecraft introduces the programme with a mechanical ecample of amplification.
A rope is wound round a motorised capstan and the two ends pulled by four men and
one girl respectively. The girl wins the tug-of-war with the help of the capstan.
Crecraft then shows a model of a torque amplifier, and demonstrates on a real torque
amplifier the problems of linearity and drift Gary Alexander discusses the simple
single stage transistor amplifier used in the first home experiment. The DC operating
conditions are measured and then an AC signal is applied to the input. The output
waveforms at various points in the circuit are displayed. Phase reversal and clipping
of the output signal are shown on the oscilloscope for different input signal conditions.
David Crecraft discusses the long tailed pair differential amplifier used in the second
home experiment. The amplifier is first DC balanced using the HEK multimeter and
signals are then applied first to one input and then to both inputs simultaneously,
and the output is monitored on the HEK oscilloscope, and on a larger twin beam scope.
Gary Alexander illustrates instability in high gain amplifiers under certain feedback
conditions, using the 741 operational amplifier first as a single stage amplifier
and then with two stage amplification. Finally, he shows the presence of noise in
the system on the oscilloscope, through loudspeakers and on a television screen. |
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locator |
holdingsInfo?bibId=170044 |
| 170044 |
type |
Collection |
| 170044 |
label |
Amplifiers and amplification |
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Description |
The aim of the programme is to show the student how his home kit experiment on the
simple single stage amplifier and the long tailed pair amplifier work. |
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Publisher |
07f21de77e80d6bd38c3be6db6cb323d |
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Title |
Amplifiers and amplification |