NAD 712 - System Block Diagram and Signal Flow; Signal Flow Diagram Explanation; Power Supply Unit Design; Power Supply Circuitry Details

BLOCK DIAGRAM
SIGNAL FLOW DIAGRAM
INPUT SELECT
cDLL
AUX_L
L-CH LDLL
VIDEO_L
TAPE1_L
TAPE2_L
TUNER_L
SPEAKER, L-CH
POWER
AMPLIFIER
PRE. OUT MAIN
IN
HEADPHONE, L-CH
PREAMP
CONTROL
SOFT °
CLIPPING
SPEAKER, R-CH
TAPE1_R POWER
TAPE2_R 7 AMPLIFIER
HEADPHONE, R-CH
MOTOR o-————
T2OUT
nm MANUAL CONTROL
>
SIGNAL
INPUT
@
—»
|
SIGNAL
OUTPUT
T1
OUT
—>P
SIGNAL
FLOW
R
POWER SUPPLY
STANDBY
RECTIFIER
&
45V
TO
DIGITAL
Ics
TRANSFORMER REGULATOR
ACVOLTAGE | MAINS
INPUT SELECT
115V/230V
4+38V TO POWER AMPLIFIERS
POWER RECTIFIER &
30V TO TUNER
TRANSFORMER REGULATOR -
-28V TO POWER AMPLIFIERS
POWER
SWITCH
+33V
TO
POWER
AMPLIFIERS
RECTIFIER & +12V ANALOG ICS
ON/STANDBY
REGULATOR -12V ANALOG ICS
-33V TO POWER AMPLIFIERS
4/8 — OHM
PIN 2 OF THE
GROUNDING
REGULATOR