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C5 R31 100K OL 1A B++ 22pF 1 4580 R56 7 4580 R46 100K C23 OL 2A B++ 22pF 2 R2B 10KA LEVEL C8 3 4 22/25 R24 20K GND C13 R35 R48 100K C25 OL 3A B++ 22pF 2 R3B 10KA LEVEL C12 GND B-5 6 Z4B 7 4580 Z4A 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 B-22/25 GND 6 GND C9 R33 22/25 5.11K GND 8 R22 20K Z2B 5 Z2A 2 C21 22/25 5.11K GND R44 R32 6 R5 R13 10K B+ 1 4580 2K 4580 R18 R19 2K R9 22/25 5.11K GND Z1B 7
C7
R45 C22 100K B++ 2 3 8
OL 1B 22pF Z3A 4 1 4580 B-5 6 Z3B 7 4580 R47 100K B++ C24 OL 2B 22pF 2 8 R58 82 1/2W R59 82 1/2W
RIGHT INPUT
1K 9.09K TRS JACK J1 C1 330pF 2 4 BZ1A R6 R10 9.09K 10K 1K R14
CW
+ -
GND 3 8
CW
8
5
GND
CH 1
+ -
J3 TRS JACK
GND
CW
1 4580 R60 82 1/2W R61 82 1/2W
3 22/25 R25 20K GND GND
Z5A 4
1 4580 B-5 6 Z5B 7 4580 C15 R36 22/25 5.11K GND R3A 10KA LEVEL C14 R49 C26 100K B++ OL 3B 22pF 2 8 R62 82 1/2W R63 82 1/2W
MONO SOURCE S1B 2P2T
CW
CH 2
+ -
J4 TRS JACK
22/25 5.11K GND
GND
CW
8
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 GND
22/25 R27 20K 5 GND 6
4
3
Z7A
1
3
Z8A
1 4580 B-Z8B 7 4580 R50 C19 R38 R51 R66 82 1/2W R67 82 1/2W
R7 R11 9.09K B+ GND 3 8 C2 330pF 2 4 BZ6A 4580 1 R20 2K 10K R15
LEFT INPUT
1K TRS JACK J2
CH 3
+ C28 22/25 5.11K GND R21 2K R4B 10KA LEVEL C16 100K B++ 2 3 8 C27 OL 4A 22pF 22/25 5.11K GND R4A 10KA LEVEL C18 100K B++ OL 4B 22pF 2 8
+ -
J5 TRS JACK
GND
CW
GND 1K 9.09K 10K
R8
R12
R16
Z9A
1
3
Z10A
1
CW
4
4580 B-R68 22/25 R28 20K GND 5 6 Z6B 7 4580 OVERLOAD/POWER SUPPLY H:\HC4\105050-2.SCH
DRAWN BY:
5 6 C20 22/25
ACTION:
NOTES (UNLESS OTHERWISE SPECIFIED): 1. ALL RESISTORS 1/4W 1% METAL FILM 2. ALL SWITCHES SHOWN IN THEIR 'OUT' OR 'OFF' POSITION
Z9B GND
7 4580
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 82 1/2W
CH 4
+ -
J6 TRS JACK
GND
HC 4 INPUTS/OUTPUTS
9-May-2001
H:\HC4\105050-1.SCH
SKH
CHECKED BY:
RWJ
10802 47th Avenue West Mukilteo WA 98275-5098
SHEET:
1
of 2
105050
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 B-14 R39 OL R B++
8
OL 1B 4148
10 LM339 5.11K D14
Z11D
13
R40
OL R
C46 0.1
C41 0.1 B-
OL 2B 4148 S2A 2P2T OL R D15 J7
POWER SUPPLY
4004 D10
B++
R76
4 LM339 5.11K
Z11B
2
R41
B+
100 C31 + C33 + 2200/16 2200/16
AC AC
OL 3B 4148 100K B++ GND 7 R30 20K OL 4A 4148 D8 R55 B-4148 100K GND 12 OL 4B LM339 5.11K GND D7 6 Z11A 1 R42 D16 3
OL R
CT
1 2 3 4 5 6
MOD JACK
C29 0.01
4004
C35 + C37 + 2200/16 2200/16
C39 0.1
R43 5.11K
C52 + 47/25
C30 0.01 D11 4004 D12 4004 S2B C32 + 2200/16 C34 + 2200/16 C36 + C38 + 2200/16 2200/16 C40 0.1
Y
D17 PWR
GND
C53 + 47/25
R77
100
B-
B--
ACTION:
HC 4 OL/PWR SUPPLY
DRAWN BY: H:\HC4\105050-2.SCH 9-May-2001
SKH
CHECKED BY:
RWJ
10802 47th Avenue West Mukilteo WA 98275-5098
SHEET:
2
of 2
105050