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_VTOP
3
5
5
3
1 7 7 EL2257C 1
+
E
EL2257C +
E
EL2257C EL2257C E
+
E
+
13 9 9 13
U12:2 U12:1
14 C 8 C C 8 C 14
- - - -
U11:1 U11:2
2
6
6
2
D
D
D
D
G G G G
S
S
S
S
B2_P B1_P
11
11
U11:3 U12:3
EL2257C EL2257C
4
4
B2_N
B1_N
This connects to
chassis gnd at the
rear panel.
_SPK
IX2 1 IX1
_BOP 2 _BGND
1 2
DR2 DR1
_SPK_GND
B3_P B3_P
3
5
5
3
1 7 7 1
+
E
EL2257C +
E
EL2257C EL2257C E
+ EL2257C E
+
13 9 9 13
14 C 8 C C 8 C 14
- - - U13:1 -
U14:1 U14:2 U13:2
2
6
6
2
D
D
D
D
G G G G
S
S
S
S
11
11
U14:3 U13:3
EL2257C EL2257C
4
4
_VBOT
IX3
IX4
DR3
DR4
PM_REF
QTY ITEM NO. PART NO. DESCRIPTION VENDOR
DR1
DR3
DR2
DR4
IX1
IX3
IX2
IX4
_BGND
_BGND
_VBOT
_VTOP
_VBOT
_VTOP
_BOP
_BOP
PM_REF
22u-25V
C129
_BOP _BGND
U21:1 U21:2
14 1 8 7
13 2 9 6
3 11
4 12
22u-25V
C125
CA3054M96 CA3054M96
U21:3
5
CA3054M96
CW
W
CCW
DN_DRV UP_DRV
_VBOT
C126
22u-25V HOT
B3_N
I_MON
DIFF_AMP_BIAS
Gain = 1/37.5
_V200
P_ISENSE
3 _BOP
+ MUTE
1 5
+
2 7
- N_ISENSE
5V=187V
6
-
_N_STEP -POL- _SPK_GND
Positive = Clip
VP
2 3
- +
1 5 1
+ _BOP
3 7 2
+ -
Values shown preclip a fixed VN 6
- +POL+ -POL-
5 volts below the rails up to
15 amps of output current.
After that, preclip advances
120 mV per ampere output,
2 14
for 12v preclip at 70 amps. - +
6 1 With values shown, the effective 10 12 15
-
step switch time delay is 4us
16
7 3 13
+ flat out to 50 KHz. -
9
5
+
VP
CLAMP_SIG Closed loop gain
=37.5 or 31.5 dB
0.84 atten. VN
CLIP
_SPK
3
+
1
2
-
VP
PRE_LIM
-POL- +15V_
5
8
+
7 -POL- LOSS_OF_FEEDBACK
Gain = 1.67
6
-
4
11
3
+
7 5 2
1
-15V_ 4
-
6
8
CLIP_FEED
VN
DN_DRV
UP_DRV
REREF
VP
VP
Limiter is shown in "fast clip-tracking"mode. VP
To convert to a slow attack/release limiter,
open the 3 places shown shorted with lines,
and make the connection shown by the
arrow line.
VN
GAIN_RETARD
8
7
SHED_V SHED_V
6
PWR_GND
5
+15V
4
PSENABLE_A PSENABLE_A
1 3
STANDBY I_SET I_SET
2 2
MSP_VMON MSP_VMON PWR_GND
3 1
D_GND PSENABLE_K PSENABLE_K
4
MSP_IMON MSP_IMON
5
280 KHz LPF
MODE_FLAG
6
CLIP_
7
-POL- 2
-
SIG_GND 1
3
+
+POL+
8
CH_IN_N
+POL+ C88
47-10NP-10%
CH_IN_P
9 +POL+ 1
J6:1
POT_TOP
10
-POL- 2
J6:2
REREF REREF
-POL- J6:3
11 3
POST_POT_N POST_POT_N
12 4
J6:4
POST_POT_P POST_POT_P
13 5
J6:5
PRE_LIM SIG_GND
14 6
J6:6
+15V_ B1_P STANDBY_LED STANDBY_LED
15 7
J6:7
SMPS_V SMPS_ON SIG_GND
16 8
J6:8
-15V_ B1_N VP VP
PRE_LIM
C63 C68 9
J6:9
VN VN
22u-25V 22u-25V
REREF
10
J6:10
+15V +15V
PROTECT
11
J6:11
V_MON V_MON
LOSS_OF_FEEDBACK CLIP
12
J6:12
PROTECT
13
J6:13
PWR_GND
14
J6:14
CLIP_FEED CLIP_FEED
15
J6:15
CLIP
16
J6:16
PWR_GND
VP
Current gain: 22,460.
3.0 mA total set curent
results in 68A peak output.
Minumum at full cut-back is
250 uA or 5.6A output.
PROTECT
VP
DIFF_AMP_BIAS
SMPS_ON
MUTE STANDBY_LED
D
G
PSENABLE_A
S
I_SET
_BOP
PSENABLE_K
Nominal I_SET = 3ma to 5ma.
Amp is fully on at I_SET>1ma.
Above 3ma fan is unaccellerated.
From 3ma to 1ma speed rises.
Below 1ma fan speed reduces
22u-25V
back linearily to normal speed.
C117
VN
_BGND
_V50 VN
600ms delay to enable audio.
200ms delay to disable audio.
1
2
_BOP
3
4 GAIN_RETARD 6
22u-25V
-
C55
7
FAN_N 5
+
Gain = 1/37.5
_SPK_GND
Fan idles at 10V up
to 60C. From 60C to
80C fan ramps from
10V to 24V. At 85C V_MON
fan V = 28V MAX. 5 2 1
+ VP
(Note that SMPS can 7
3
also speed fan up.) 6
-
-POL-
MSP_VMON
B3_N
_N_STEP
SNAPPER PTC
5
+ P_ISENSE
7
6
-
6 2
- -
5V = 100 deg C. 7 1
5 3
+ + N_ISENSE
Total Gain = 16.85dB
3
+
1 VN
2
-
HOT=250uA
@ 80 deg C.
VP
I_MON
HOT
MSP_IMON
U1
The "HOT" threshold is 80C
2.5V-1%
Cutback begins at 100C and