Using your results in step 1, design and build the 2-level voltage level meter in Figure 5. Note that voltage node V₁ in the voltage divider (Figure 4) is connected to the inverting input of one of the op-amps and voltage node V₂ in the voltage divider is connected to the inverting input of the other op- amp. Use the equation in the "Light Emitting Diodes" supplement to determine values for Rlimiting so that the current through each LED (when on) is 10 mA, as specified in the supplement.

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter18: Resistive-inductive Parallel Circuits
Section: Chapter Questions
Problem 8PP: In an R-L parallel circuit, ET=48 volts, IT=0.25 amps, R=320. Find XL.
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1. When we build our level meter, we will need some fixed voltages to serve as
references for comparison. We can produce these voltage references
through the use of voltage division -- dividing down the positive voltage rail
used to power the op-amps. See Figure 4. Use your results from prelab to
choose values for R1, R2, and R3 such that V₁ = 8 V and V₂ = 4 V.
15V
R
R2
R3
www
V2
ww
Figure 4. Voltage references for the level meter.
Transcribed Image Text:1. When we build our level meter, we will need some fixed voltages to serve as references for comparison. We can produce these voltage references through the use of voltage division -- dividing down the positive voltage rail used to power the op-amps. See Figure 4. Use your results from prelab to choose values for R1, R2, and R3 such that V₁ = 8 V and V₂ = 4 V. 15V R R2 R3 www V2 ww Figure 4. Voltage references for the level meter.
Using your results in step 1, design and build the 2-level voltage level meter
in Figure 5. Note that voltage node V₁ in the voltage divider (Figure 4) is
connected to the inverting input of one of the op-amps and voltage node V₂
in the voltage divider is connected to the inverting input of the other op-
amp. Use the equation in the "Light Emitting Diodes" supplement to
determine values for Rlimiting so that the current through each LED (when on)
is 10 mA, as specified in the supplement.
Vin
R1
R2
R3
+15
-15
+15
+
8
-15
U1A
U1B
Rlimiting
Rlimitin
Figure 5. Two LED level meters.
ALED
4
LED2
Transcribed Image Text:Using your results in step 1, design and build the 2-level voltage level meter in Figure 5. Note that voltage node V₁ in the voltage divider (Figure 4) is connected to the inverting input of one of the op-amps and voltage node V₂ in the voltage divider is connected to the inverting input of the other op- amp. Use the equation in the "Light Emitting Diodes" supplement to determine values for Rlimiting so that the current through each LED (when on) is 10 mA, as specified in the supplement. Vin R1 R2 R3 +15 -15 +15 + 8 -15 U1A U1B Rlimiting Rlimitin Figure 5. Two LED level meters. ALED 4 LED2
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