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KAC-714
CIRCUIT DESCRIPTION
Description of Components
AUDIO UNIT (X09-5020-10)
Device
Use and Function
Operation and Condition
NJM4565D
Isolation amplifier
Eliminates car noise from the RCA input, and adjust its gain.
NJM4565D
Speaker level input amplifier
Balanced-unbalanced amplifier for the speaker level input.
| NJM4565D
Summing amplifier
Mixing of the RCA input and speaker level input.
NJM4565D
LPF
Filter passing the lower frequencies than a threshold between 30 and
200Hz (variable).
pPC494C
Oscillator for DC/DC converter
wPC1237HA
2SC945(A) (Q,P)
2SA992(F,E)
2SC1845(F,E)
Protection
Overload DC offset. Activated by P-CON.
Input differential amplifier
2nd stage differential amplifier
3rd stage differential amplifier
2SC1845(F,E)
Cascode stage
2SA992(F,E)
Current mirror
2SC945(A) (Q,P)
2SC2590(Q,R)
Temperature compensation
Power drive stage
2SA1110(Q,R)
Power drive stage
2SC4387LB*5
Power stage
Q151
Q152
Q201
Q202
Q203, 204
Q205, 206
2SA1672LB*5
2SC945(A) (Q,P)
DTA124ES
2SA992(F,E)
2SC3940A(R,S)
2SA1534A(R,S)
2SC945(A) (Q,P)
2SA1534AiR,S)
2SC945\(A) (Q,P)
2SA733(A) (Q,P)
Power stage
Input muting
When the amplifier is switched OFF, activated before the relay to
protect the relay contact.
Input muting driver
Current detection
Activates IC5 upon detection of overcurrent.
+16V regulated voltage.
+£16V regulated voltage.
P-CON ON detection.
Power switch
Switching drive
Switching drive
Supplies power to IC4.
Q207, 208
2SK1946
Switching power stage
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