28119 Parallax Inc, 28119 Datasheet - Page 119
28119
Manufacturer Part Number
28119
Description
KIT UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Datasheet
1.28119.pdf
(137 pages)
Specifications of 28119
Lead Free Status
Contains lead
Accessory Type
Oscilloscope
Interface Type
USB
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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When you up the gain to 3 (Ri = 1 kΩ and Rf = 2 kΩ) your signal will most likely be
heavily clipped, as shown in Figure 8-13. We won’t calculate the gain, but the signal is
worth examining anyway since it illustrates a common phenomenon in amplifier design.
Clipping happens when the gain tries to make an output signal that is outside the dynamic
range the amplifier. This type of distortion is undesirable if the goal is accurate sound
reproduction, for example. However, this type of signal distortion is frequently found in
rock music.
√
√
√
√
Again repeat this exercise, using a 1 kΩ resistor for Ri and a 2 kΩ resistor for Rf.
Observe your heavily clipped signal, as shown in Figure 8-13.
Set the Horizontal Bars cursors at the top and bottom of the clipped signal.
Under the Measurements tab, look for the MAX measurement in the CH2 Auto
Measurements box.
Figure 8-12:
Op-am input and
output signals
Above: Output
signal with a non-
inverting amplifier
gain of 2 (not
clipped) using a
fully-charged 9 V
battery.
Below: Same
output signal
clipped because a
9 V battery was
used that is near
the end of its
useful life.
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