Symetrix 421M, 1C00 Schematic

D

C

B

A

6

5

4

3

2

1

REVISION RECORD

LTR

REVISIONS DONE OR ECO NUMBER:

DATE:

J3-1

3.0

REMOVE DE-THUMP, "FINALIZE" COMP VALUES

0 9 / 2 1 / 9 5

+

A.0

"FINALIZE" COMPONENT VALUES AGAIN,

11/08/95

FIX EXPANDER THRESHOLD, RELEASE TO PRODUCTION.

J 3 - 2

B.0

CHANGE C9-12 TO METALIZED POLY

0 4 / 0 5 / 9 6

B01

Chg fuse text to reflect changed values.

-

0 7 / 0 5 / 9 6

D

C3

C4

C79

C53

INPUT_LVL

LOGIN

C

Add R187,R210,C80,C81 (sheet 6) per ECN138

0 4 / 1 4 / 9 9

220pF

220pF

220pF

220pF

SH6

SH4,6

J 3 - 3

( 0

t o - 1 0 d B )

R2

R4

R6

LINE GAIN

R20

R21

R24

SH7

RLY-

(BACK PANEL)

+15V

RL1

RLY+

J 3 - 4

J2

CW

SH7

1K00

9K09

4K99

61.9

10K0

100

4

J 3 - 5

C1

C5

C14

R177A

U4

3

7

C17

+

470pF

100p

5

47NP

LINE

10KA

EC1

VCC

J 3 - 6

C2

100p

R14

1

INPUT

1/4" TRS JACK

1

IN

2150A

8

6

-

U3B

-

470pF

XLR-MALE

2

U1A

R178

13K0

OUT

7

3

S

V

E

G

5

J4

R1

R3

-

1

+

R26

+55V

3

4K22

Y

E

C

N

NE5532

2

2

J 3 - 7

+

100K

1

C13

M

E

2

D

SH7

Q16

1K00

9K09

4

5

2

6

R22

3

GND

RC4560

4.7NP

8

6

TIP30A

R5

C6

R244

R241

4K99

100p

R19

10K0

4

C

Z3

4K99

+15V

7

59K0

R240

R16

R23

PHANTOM

200

R232

1M

160035

(SHOWN OUT)

D70

78K7

2

3

R245

R231

2K00

1

R17

10K0

C16

1N4742

2K00

6

U1B

61.9

C15

-

SW7A

1

12V

249

7

50K

2

R27

R234

5

47NP

+

22pF

R25

100K

R243

R15

THD

J5

2 0

MIC GAIN

RC4560

CW

3

R35

2

-

U3A

10K0

CW

1

100

1K21

R248

(BACK PANEL)

R242

R18

3

+

1K00

78K7

R233

C73

- 15V

61.9

R228

2

SW2A

NE5532

- 15V

2K5 - C

SH6

1/4" TRS JACK

100

6 KHz

R31

R30

L1

330pF

VCA_CV

(SHOWN OUT)

10K0

10K0

BEAD

R237

1

133 mV/dB

C70

Q12

3

R28

R246

470pF

2N4403

Q13

C12

2N4403

10K0

C11

C72

10K0

470pF, 2.5%

U13A

R238

R12

R13

B

4K99

2

100K

.0047

C18

+

-

1

R9

.0047

U2B

R227

3

100p

C74

+

U2A

6K49

6K49

5

100

RC4560

+

U5A

OUT_LVL

4 7 / 6 3

R235

3

7

2

R247

R236

C84

6K49

+

6

-

SH5

L2

C78

10K0

1

C10

-

1

D69

2

-

3

+

BEAD

R10

.0022

RC4560

4K99

330pF

100K

R229

4.7NP

6K49

RC4560

RC4560

U13B

6

-

1K00

7

R29

5

C9

C19

+

C69

R230

10K0

.0022

C71

D68

RC4560

100p

1K00

470pF, 2.5%

470pF, 2.5%

XLR-FEM

C7

SW8A

MIC

2

1

1

.056

2

R7

3

3

COMPANY:

SYMETRIX INC.

-15V2

15K0

(SHOWN OUT)

J1

NOTE:

SH6

125 Hz

14926 35th Avenue West

A

C68

C8

5

U5B

R11

1. ALL DIODES 1N4148 UNLESS NOTED

+

7

100K

Lynnwood, WA 98037-2303

USA

.056

2. ALL RESISTORS IN OHMS

6

-

C85

3. ALL CAPS IN uF UNLESS NOTED

TITLE:

REV:

R8

470pF, 2.5%

RC4560

DRAWN:

R B

DATED:

421M - AGC LEVELER

C

30K1

3 / 2 1 / 9 5

.001

DRAWING NO:

RELEASED:	DATED:	52 421M 1	SHEET: 1 OF 7

6	5	4	3	2	1

D

C

B

A

+15V

"ON" IN AUTO

(CAUSES GAIN TO DECREASE IF STEADY STATE

U6A

Q3

SIGNAL PRESENT, SUCH AS FEEDBACK)

2N5458

2

-

R70

1

R49

3

ARM

+

100

SH4

10K0

LM324

R65

R66

R69

1M

R67

4K99

4K99

383K0

D2

R42

Q2

1K00

2N4401

IN15

R37

D8

R68

D3

R51

SH7

R41

383K0

EXP_CV

200K

1M

D5

9K09

SH3

U7D

D17

R52

D6

D1

D4

EXPAND

12

+

R50

10K0

14

R278

D93

GREEN

Q1

U7C

13

-

U7B

13K0

5

R55

U6B

9

LM324

+

6

2N5458

-

8

4K99

7

-

R39

R40

R48

6

7

10

+

U7A

-

4K99

5

2

LM324

LOG_OUT

+

2K67

20K0

10K0

-

1

LM324

LM324

R43

SH4

3

R36

2

R47

+

"OFF" IN AUTO

C21

R44

500KA

R45

1M

.47uF

1

3

150K0

LM324

20K0

EXPANDERCW

2K00

RELEASE

+

C23

C24

R46

R38

R56

D10

(FRONT PANEL)

2.2

4.7NP

1M

R64

4K99

768K

D53

+15V

13K0

+15V

R74

R63

- 15V

- 15V

10K0

2M2

R112

D7

10K0

R62

HIGH WHEN EXP IN BYPASS

R60

R113

383K0

10M

1K21

U6D

13

-

14

12

R59

R61

+

LM324

AUTO

13K0

4K99

1

LOW WHEN IN AUTO

R58

EXPANDER

50KB

THRESHOLD

2

(FRONT PANEL)

R75

CW

3

10K0

BYPASS

U6C

R54

9

-

20K0

OPEN WHEN IN AUTO

R71

8

10

+

Q17

10K0

LM324

R57

2N4401

R73

10K0

COMPANY:

SYMETRIX INC.

10M

R103

R72

10K0

D9

R249

14926 35th Avenue West

10K0

Lynnwood, WA 98037-2303 USA

3M3

- 15V

TITLE:

421M - EXPANDER

REV:

DRAWN:

R B

DATED:

C

3 / 2 1 / 9 5

DRAWING NO:

- 15V

RELEASED:

DATED:

52 421M 1

SHEET:

2 OF 7

D

C

B

A

6	5	4	3	2	1

D	LOG_OUT		D
	SH4	+15V

D71

+15V

R80

IN15

U25B

SH7

158K0

D12

U8D

CW

3

5

+

R83

+15V WHEN UNIT IS ENABLED

R78

7

12

+

R76

6

14

-

100

13

50KB

2

249K0

RC4560

-

R95

+

R85

LM324

R87

OUTPUT LIMITER

1

R84

C20

R81

10K0

10M

200K

C22

D14

THRESHOLD

2.2

10K0

U20B

RED

30K1

22pF

4

-

2

R89

LIMIT

D11

- 15V

Q19

5

D13

+

4K99

2N5458

- 15V

LM339

R86

R88

C

C

+15V

R97

R96

15K0

10K0

59K0

1M

R82

U8C

D63

AGC OR LIMITER

CW

2K37

RATIO_BUF2

10

+

R99

3

R79

8

CONTROL VOLTAGE

50K

2

SH4

9

D15

-

R77

1

R259

15K8

200K

LM324

THRESHOLD

TRIM

10K0

POSITION OF RATIO POT

R101

R98

+15V

- 15V

35K7

R260

20K0

R91

R90

R93

R94

RATIO_BUF1

100K

U9D

CV

SH4

40K2

30K1

49K9

49K9

R102

SH6

LM324

EXP_CV

13

-

R92

U9A

U9B

10

14

+

2

6

D92

8

SH2

30K1

12

B

-

1

-

+

B

7

9 -

U9 - 8 should go high for

49K9

3

+

5

+

about .5 seconds when the

LM324

U9C

ratio pot is turned CCW.

LM324

LM324

C83

CAUSES C20 TO DISCHARGE RAPIDLY.

4.7NP

R100

49K9

+15V

1

COMPANY:

SYMETRIX INC.

A

TARGET

50KB

2

R33

3

U25A

A

OUTPUT

R32

200K

2

+

1

14926 35th Avenue West

-

Lynnwood, WA 98037-2303 USA

LEVEL

CW

3

(FRONT PANEL)

R34

C76

RC4560

TITLE:

REV:

DRAWN:

R B

DATED:

421M - LIMITER

C

158K0

.47uF

3 / 2 1 / 9 5

- 15V

DRAWING NO:

RELEASED:

DATED:

52 421M 1

SHEET:

3 OF 7