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Philips Semiconductors
Using the NE/SA5234 amplifier
V
CC
I
B2
–
I
2
INPUT
+
I
1
I
B3
V
EE
INTERMEDIATE STAGE
100
80
60
dB
G1000
40
20
0
10Hz
1991 Oct
I
I
B5
B6
I
B4
Q53,54
Q51,52
C2
Q61
V
B4
C1
I
B7
CURRENT CONTROL
100Hz
1kHz
Figure 5. NE5234 Closed Loop Gain vs Frequency
D2
Q83
I
B8
Q84
C3
C4
Q72
Q78
Q62
CLASS
AB
CONTROL
I
B9
CLASS AB OUTPUT
Figure 4.
10kHz
100kHz
1MHz
FREQUENCY
4
Application note
AN1651
R82
R85
R76
Q81
Q85
Q82
C5
OUTPUT
C6
Q71
Q75
D3
R86
R75
10 6
10
SL00632
SL00633
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