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Studio Reference
II
II
I
&
IIII
IIII
II
Professional Studio Amplifiers
Fig. 5.1 Circuit Block Diagram
FAULT
ONLY ONE CHANNEL SHOWN
NPN HI
OUTPUT
STAGE
NPN LOW
OUTPUT
STAGE
PNP LOW
OUTPUT
STAGE
PNP HI
OUTPUT
STAGE
+
OUTPUT
+Vcc
–Vcc
TRANSLATOR
LVA
LVA
+Vcc
–Vcc
BIAS
CURRENT
LIMIT
TRANSLATOR
BALANCE
INPUT STAGE
P.I.P.
BALANCED
INPUTS
1/4" PHONE
XLR
VARIABLE
GAIN STAGE
ERROR
AMP
DISPLAY
BIAS
BRIDGE
BALANCE
+Vcc
–Vcc
POWER
SUPPLY
CONTROL
DC/LF
TIMER
POWER
+Vcc
–Vcc
ODEP
A
B
A
(ODEP)
B
(ODEP)
SUPPLY
D
E
(DISPLAY)
D
C
(DISPLAY)
E
HS
TEMP
C
(ODEP)
+24
–24
ENABLE
OVER
VOLTAGE