Crown Audio S Series - Manual (Page 20)

Operation Manual
S-Series Power Amplifiers
page 20
5 Principles of Operation
Figure 5.1
S-Series
Amplifier Block
Diagram
(Shown with
Standard Input
Module)
TRANSLATOR LVA
BIAS
CURRENT
SOURCE
BALANCE
INPUT STAGE
VARIABLE
GAIN STAGE
ERROR
AMP
BALANCED
INPUTS
TO SIGNAL
PRESENCE
INDICATOR
COMPRESSOR
CONTROL
TO CLIP
INDICATOR
BUFFER
MUTE
DC PROTECT
LOGIC
TO
FAULT
CONNECTOR
–VCC –VCC
+ HI-VOLTAGE
BOOTSTRAP
BIAS BIAS BIAS BIAS BIAS
TDVI
LIMITER
TRIPLE-DEEP
DARLINGTON
NPN POSITIVE
OUTPUT STAGE
TRIPLE-DEEP
DARLINGTON
NPN NEGATIVE
OUTPUT STAGE
PROPORTIONAL
SPEED
FAN
CONTROL
FAN
DC
PROTECT
HEATSINK
TEMPERATURE
OUTPUT
CONTROL
HEATSINK
TEMPERATURE
TRANSFORMER
TEMPERATURE
TO FAULT
INDICATOR
POWER
SUPPLY
+ VCC
+ 15V
– 15V
– VCC
TURN-ON
DELAY
+
OUTPUT
BOOTSTRAP
CIRCUIT
+ HI-VOLTAGE
BOOTSTRAP