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C5 R31 100K OL 1A B++ 22pF 1 4580 R56 7 4580 R46 100K B++ 22pF 2 R2B 10KA LEVEL C8 3 4 22/25 R24 20K GND C13 R35 R48 100K B++ 2 R3B 10KA LEVEL C12 8 C25 OL 3A 22pF GND B-5 6 Z4B 7 4580 Z4A 1 4580 R60 82 1/2W R61 82 1/2W C15 22/25 GND R3A 10KA LEVEL C14 R36 5.11K GND C23 OL 2A 82 1/2W C11 22/25 GND R2A 10KA LEVEL C10 R34 5.11K 82 1/2W R57 GND R1A 10KA LEVEL C6 22/25 R23 20K GND C3 22/25 R1B 10KA LEVEL C4 3 4 Z2A B-22/25 GND 6 GND C9 R33 22/25 5.11K GND 8 R22 20K Z2B 5 2 22/25 GND C21 5.11K R44 R32 22/25 5.11K GND Z1B 4580 R19 2K 7
C7
R45 100K B++ 2 3 8 C22 22pF Z3A 4 1 4580 B-5 6 Z3B 7 4580 R47 100K B++ C24 22pF
6 R5 R13 10K B+ GND 3 8 C1 330pF 2 4 4580 2K Z1A R6 R10 9.09K 10K 1K R14 B1 R9 9.09K
OL 1B
RIGHT INPUT
1K TRS JACK J1
CW
+ R18
CW
8
5
R58
82 1/2W R59
GND
82 1/2W
CH 1
+ -
J3 TRS JACK
OL 2B 2 8
GND
CW
3 22/25 R25 20K 5 GND 6
Z5A 4
1 4580 B-7 Z5B 4580 R49 100K B++ C26 22pF
CW
MONO SOURCE S1B 2P2T
R62
82 1/2W R63
82 1/2W
CH 2
+ -
J4 TRS JACK
22/25 5.11K GND
OL 3B 2 8
GND
CW
4
4580 22/25 B-R26 20K GND GND C17 5 6 R37 Z7B 7 4580 R64 82 1/2W R65 82 1/2W R50 GND
22/25 R27 20K
CW
4
3
Z7A
1
3
Z8A
1 4580 B-5 GND 6 Z8B 7 4580 C19 R38 R51
R66
R7 R11 9.09K B+ GND 3 8 C2 330pF 2 4 4580 Z6A 1 R20 2K 10K R15
82 1/2W R67
LEFT INPUT
1K TRS JACK J2 + -
82 1/2W
CH 3
+ C28 22/25 5.11K GND R21 2K 100K B++ 2 R4B 10KA LEVEL C16 3 8 C27 OL 4A 22pF 22/25 5.11K GND R4A 10KA LEVEL C18 100K B++ 22pF
J5 TRS JACK
OL 4B 2 8
GND
CW
GND 1K 9.09K 10K
R8
R12
R16
B-
Z9A
1
3
Z10A
1
CW
4
4580 B-R68 22/25 R28 20K GND 5 6 Z6B 7 4580 C20 22/25
ACTION:
5 6 GND Z9B 7 4580
NOTES (UNLESS OTHERWISE SPECIFIED): 1. ALL RESISTORS 1/4W 1% METAL FILM 2. ALL SWITCHES SHOWN IN THEIR 'OUT' OR 'OFF' POSITION
82 1/2W R69 82 1/2W
GND
22/25 R29 20K GND
4
4580 B-5 6 Z10B 7 4580
R70
82 1/2W R71
CH 4
82 1/2W
+ -
J6 TRS JACK
GND OVERLOAD/POWER SUPPLY H:\MH4\100460-2.SCH
DRAWN BY: H:\MH4\100460-1.SCH 15-Dec-1997 CHECKED BY: 10802 47th Avenue West Mukilteo WA 98275-5098
MH 4 INPUTS/OUTPUTS
SHEET:
SKH 11MAR96
RGH 23MAR96
1
of 2
100460
OVERLOAD CIRCUIT
B++
R17 15.8K 9 D1 OL 1A 4148 D2 R52 100K GND B+ 11 D3 OL 2A 4148 D4 R53 100K GND D9 5 D5 OL 3A 4148 D6 R54
CT
DECOUPLING CAPS
Z11C LM339 C47 0.1 C48 0.1 5.11K D13 C49 0.1 C50 0.1 C51 0.1 C42 0.1 C43 0.1 C44 0.1 C45 0.1 14 R39 OL R
8
B++
OL 1B 4148
B--
10 LM339 5.11K D14
Z11D
13
R40
OL R
C46 0.1
C41 0.1 B-
OL 2B 4148 S2A 2P2T
POWER SUPPLY
B++
R76 4004 D10
4 LM339 5.11K D15
Z11B
2
R41
OL R
B+
100 C31 2200/16 J7 1 2 3 4 5 6 C29 0.01 4004
+
C33 2200/16
AC AC
+
C35 2200/16
+
C37 2200/16
+
C39 0.1
OL 3B 4148 100K B++ GND 3
R43 5.11K
C52 47/25
+
7 R30 20K OL 4A 4148 D8 R55 B-4148 100K GND 12 OL 4B LM339 5.11K GND D7 6 Z11A 1 D16 R42
OL R
CT
C30 0.01 MOD JACK D11 4004 D12 4004 S2B C32 2200/16
+
Y C34 2200/16
+
C36 2200/16
+
C38 2200/16
+
C40 0.1
D17 PWR
GND
C53 47/25
+
R77
100
B-
B--
ACTION:
MH 4 OL/PWR SUPPLY
DRAWN BY: H:\MH4\100460-2.SCH 15-Dec-1997 CHECKED BY:
SKH 11MAR96
RGH 23MAR96
10802 47th Avenue West Mukilteo WA 98275-5098
SHEET:
2
of 2
100460