DUC 1. In Fig. 12-4, what are the functions of the VR1 and VR2? 2. In Fig. 12-4, what is the function of the VR3? VR₁ 50k C₁ R1 0.1 100k Carrier Input U₁ A741 PWM signal input R41k www Re 1k w C7 ± 10μT R7 100 ww =L H C4 2.2 H W82 Rs 51 3 10 U3 MC1496 C2 R2 U2 A741 22 0.1 100k VR2 50k VR3 100kr 14 C3 10μ 1k 0.1 4 5 6 12 m Re 10k R9 R102 3.9k 3.9k HHI C10 0.1 -0 +12V C11 R 0.02 100k +12 V Demodulated output C R11 R12 A741 0.33 10k 100k -12 V Ca 1μ C12 1500p PRODUC Fig. 12-4 PWM demodulator PRODUCTS

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DUC
1. In Fig. 12-4, what are the functions of the VR1 and VR2?
2. In Fig. 12-4, what is the function of the VR3?
VR₁
50k
C₁ R1
0.1 100k
Carrier
Input
U₁
A741
PWM signal
input
R41k
www
Re 1k
w
C7 ±
10μT
R7 100
ww
=L
H
C4
2.2
H
W82
Rs 51
3
10
U3
MC1496
C2
R2
U2
A741
22
0.1 100k
VR2
50k
VR3
100kr
14
C3
10μ
1k
0.1
4
5
6
12
m
Re
10k
R9 R102
3.9k 3.9k
HHI
C10
0.1
-0
+12V
C11
R
0.02 100k +12 V
Demodulated
output
C
R11
R12
A741
0.33 10k
100k
-12 V
Ca
1μ
C12
1500p
PRODUC
Fig. 12-4 PWM demodulator
PRODUCTS
Transcribed Image Text:DUC 1. In Fig. 12-4, what are the functions of the VR1 and VR2? 2. In Fig. 12-4, what is the function of the VR3? VR₁ 50k C₁ R1 0.1 100k Carrier Input U₁ A741 PWM signal input R41k www Re 1k w C7 ± 10μT R7 100 ww =L H C4 2.2 H W82 Rs 51 3 10 U3 MC1496 C2 R2 U2 A741 22 0.1 100k VR2 50k VR3 100kr 14 C3 10μ 1k 0.1 4 5 6 12 m Re 10k R9 R102 3.9k 3.9k HHI C10 0.1 -0 +12V C11 R 0.02 100k +12 V Demodulated output C R11 R12 A741 0.33 10k 100k -12 V Ca 1μ C12 1500p PRODUC Fig. 12-4 PWM demodulator PRODUCTS
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