130-28176 Parallax Inc, 130-28176 Datasheet - Page 173
130-28176
Manufacturer Part Number
130-28176
Description
KIT PARTS PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 130-28176
Accessory Type
Education Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Board of Education Full Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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What would happen if the output was not connected directly to the inverting input, but
used a voltage divider to cut the output voltage in half before being fed to the inverting
input as shown in Figure 5-17?
With the non-inverting terminal set to V
balance the inputs. If the op-amp’s output is V
inverting input? The voltage divider of R
inverting terminal senses 1 V. The output must go higher. At what voltage will the input
sense 2 V? When the op-amp output is 4 V. What would the output be when the non-
inverting input is 3 V? The output will be 6 V. For each change of 1 V
changes by 2 V.
The voltage gain (Av) of the circuit is 2 and is described by the formula:
Time to test it out!
A
A
V
v
v
O
= 1+ R
= 1 + 10 kΩ/10 kΩ = 1+1 = 2
= (A
v
)(V
f
/R
I
i
) = 2(2 V) = 4 V
I
= 2 V, the output will drive in an attempt to
f
and R
O
i
= 2 V, what voltage will be at the
cuts the voltage in half so that the
Figure 5-17
Example of Non-
Inverting Op-Amp
I
, the output
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