28119 Parallax Inc, 28119 Datasheet - Page 118

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

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

You will repeat this exercise using different resistor values for Ri and Rf to create a
gain of 2 and a gain of 3. When you repeat this exercise for a gain of 2, where Ri = 1
kΩ and Rf = 1 kΩ, your signal may or may not be clipped. This will depend on your
supply voltage, which determines the dynamic range of the amplifier. Whenever the
op-amp tries to send a voltage that is beyond its dynamic range, the actual output will
stop at the limit of its dynamic range. If you are using a fresh 9 V battery, your signal
might not be clipped, but if it is close to worn out, your signal might be clipped.
Figure 8-12 shows what the signal with a gain of 2 might look like if it is clipped or
not clipped.
√
√
√
Repeat this exercise using a 1 kΩ resistor for Ri and a 1 kΩ resistor for Rf in
your circuit.
Set your Cursor Settings switches to Horizontal Bars and Floating .
Measure the amplitude of the new output signal, noting the ∆ V value. If your
signal is clipped, you may have to visually estimate the placement of the upper
cursor as shown in the bottom picture of Figure 8-12.
Figure 8-11:
Input and output
signals for a
non-inverting
amplifier with a
gain of 2