PROD 1. What is the function of VR, in Figs. 11-2 and 11-7. DL RO 0.014 +12V R₁ 1k ww Vin(+) 6 C₁ 0.1μ Audio input HH VRI Vin(-) 4 U1 HА741 10k ww R2 10k UCTS 0.01 μ -12V PWM output Fig. 11-2 The pulse width modulator based on μA741 +12 V ° C₂ 100 R₁ 300 Re 300 Cs 100 ww ww Vcc 4 reset 2 trigger 5 control voltage U₁ LM555 GND www R₂ T₁ 10k output 3 discharge Z Voc output 3 reset VR₁ 5k 2 trigger 7 discharge Ra 1k threshold 6 control 6 threshold voltage GND Rs CA U2 LM555 1 2k 100 Ca 0.01 Audio lutput www R7 10k O PWM C6 -0.014 Fig. 11-7 Pulse width modulator 11/9 Output

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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PROD
1. What is the function of VR, in Figs. 11-2 and 11-7.
DL
RO
0.014
+12V
R₁ 1k
ww
Vin(+)
6
C₁ 0.1μ
Audio
input
HH
VRI
Vin(-)
4
U1
HА741
10k
ww
R2 10k
UCTS
0.01 μ
-12V
PWM
output
Fig. 11-2
The pulse width modulator based on μA741
+12 V
°
C₂ 100
R₁ 300
Re 300
Cs 100
ww
ww
Vcc
4
reset
2
trigger
5 control
voltage
U₁ LM555
GND
www
R₂
T₁
10k
output
3
discharge Z
Voc
output 3
reset
VR₁
5k
2 trigger
7
discharge
Ra
1k
threshold 6
control
6
threshold
voltage
GND
Rs
CA
U2 LM555 1
2k
100
Ca
0.01
Audio lutput
www
R7
10k
O PWM
C6
-0.014
Fig. 11-7 Pulse width modulator
11/9
Output
Transcribed Image Text:PROD 1. What is the function of VR, in Figs. 11-2 and 11-7. DL RO 0.014 +12V R₁ 1k ww Vin(+) 6 C₁ 0.1μ Audio input HH VRI Vin(-) 4 U1 HА741 10k ww R2 10k UCTS 0.01 μ -12V PWM output Fig. 11-2 The pulse width modulator based on μA741 +12 V ° C₂ 100 R₁ 300 Re 300 Cs 100 ww ww Vcc 4 reset 2 trigger 5 control voltage U₁ LM555 GND www R₂ T₁ 10k output 3 discharge Z Voc output 3 reset VR₁ 5k 2 trigger 7 discharge Ra 1k threshold 6 control 6 threshold voltage GND Rs CA U2 LM555 1 2k 100 Ca 0.01 Audio lutput www R7 10k O PWM C6 -0.014 Fig. 11-7 Pulse width modulator 11/9 Output
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