Clear-Com ICS-21, Instruction Manual

I C S - 2 1 / 2 1 D T   S P E A K E R   S T A T I O N

4 - 7

 Figure 7: ICS-21/21DT Schematic (identical to Clear-Com’s KB-212 schematic)

A

A

B

B

C

C

D

D

E

E

4

4

3

3

2

2

1

1

C5

220uF

+

R43

33.2K*

R45

10

IC8B

LM833

+

-

S2

D8

Green

C38

.01uF

R40

100*

C45

100uF

+

IC2B

LM833

+

-

C8

4.7uF

+

Q2

MMBT2907A

IC2A

LM833

+

-

R28

1.3K 1/2W

IC10

7805L

C21

22uF

+

P5

C42

10uF

+

C3

.1uF

C43

1uF

+

R39

390

C17

470pF

R18

5.6K

R17

1.2K*

R48

220K

R49

1M

R5

100K

C16

.22uF

R15

430*

C13

4.7uF

C4

.1uF

C29

.1uF

R24

20K*

IC1A

LM833

+

-

J1

R3C

47K*

Q3

MMBT

A64

R3D

47K*

R6A

100K*

IC5

LM384

-

+

C36

47pF

R6B

100K*

D2

BA

V99

R3A

47K*

C25

100uF

+

R37

5K POT

R3B

47K*

S1A

5101

14

S1B

5101

14

S1C

5101

14

C12

.1uF

D7

BA

V70

R41

300*

R2

47K*

R4

47K*

R46

470K*

R47

470K*

C7

47pF

D3

C47

.1uF

R14

2K*

R31

1.5K*

D4

5.1V

Q4

MMBT

A14

C34

.47uF

+

R8

10K*

R38

2K*

D1

BA

V70

IC4A

DG444

C15

.1uF

IC1B

LM833

+

-

D6

BA

V99

R6D

100K*

Q1

MMBFJ175

R30

10K POT

C32

.01uF

C35

.01uF

C37

.047uF

C46

.1uF

R32

20K*

R44

10K*

C24

22uF

+

C41

.1uF

R35

68.1K*

R36

68.1K*

P3

S3

C28

.22uF

R21

100K*

P6

IC9

PIC16C505

IC4C

DG444

R1B

10K*

C40

.1uF

C39

.1uF

R29

1K*

R1A

10K*

J2

R10

475*

C22

.22uF

R12

20K*

C19

47pF

R1C

10K*

R13

15K*

C27

.0047uF

C23

.047uF

R23

6.2K*

R22

120K*

C26

220pF

C1

1

.0015uF

IC4B

DG444

C14

22pF

R25

5K POT

R16

12.1K*

R7C

10K*

R7B

10K*

R7A

10K*

R7D

10K*

R42

8.2K*

C31

.47uF

+

C33

.01uF

R6C

100K*

IC4D

DG444

R9A

10K*

J3

C18

220uF

+

R19

10

R9B

10K*

R9C

10K*

R9D

10K*

R20

4.7K*

R1D

10K*

IC8A

LM833

+

-

R27

2.2

P2

C30

47pF

D5

BA

V99

P1

C44

.01uF

R26

3.24K*

C10

390pF

R33

15K*

R34

10K POT

C6

1uF

+

C20

1uF

+

P4

Bias

+V2

+V2

+V2

+V2

+V2

VDD

VDD

VDD

+V2

+V2

VDD

Bias

Bias

Bias

Bias

Bias

Bias

Bias

Bias

VDD

+V3

+V3

VDD

Bias

+V1

+V1

+V1

+V1

+V1

+V1

+V1

+V1

5

6

7

2

1

3

5

4

6

5

6

7

2

1

3

3

2

1

8

4

VIn

3

VOut

1

GND

2

1

2

3

3

2

1

8

4

1

2

3

4

5

6

7

8

9

10

3

6

4

5

1

8

6

2

8

7

3

1

14

4

5

10

11

12

13

2

7

1

2

3

1

8

3

1

2

2

7

1

6

2

5

3

4

1

2

3

1

3

1

2

3

3

1

2

13

4

5

12

5

6

7

1

2

3

4

5

3

2

1

3

1

2

1

2

3

4

5

6

7

8

2

1

3

5

4

6

1

2

3

4

5

6

RB0

13

RB1

12

RB2

11

RB3

4

RB4

3

RB5

2

RC0

10

RC1

9

RC2

8

RC3

7

RC4

6

RC5

5

VDD

1

VSS

14

11

9

10

2

7

1

8

1

2

3

4

3

6

6

8

7

3

1

2

3

6

2

7

1

8

4

5

3

6

14

16

15

1

8

1

2

3

4

5

6

7

8

2

7

3

6

4

5

4

5

3

2

1

8

4

1

2

3

1

2

3

1

2

3

4

5

6

7

8

9

10

3

1

2

1

2

3

4

5

1.  

ALL

 RESIST

ORS 

ARE 1/10W 5% LISTED IN OHMS

2.  

ALL

 CAP

ACIT

ORS 

ARE LISTED IN MICROF

ARADS

P

ANEL

MIC

SPEAKER OUTPUT

PREAMP

INTERCOM

LINE

DRIVER

INTERCOM

LINE

RECEIVER

POWER

AMPLIFIER

MIC SENS

CALL

SIGNAL

CALL

OPERA

TING MODE       S1B     S1C

Normal                         OFF     OFF

Remote Page                OFF      ON

Remote Listen               ON      OFF

Remote Listen-Page       ON      ON

PROGRAMMING / 

TEST

 INTERF

ACE

1 - Gnd / Gnd

2 - Data / Strobe

3 - n/a / Data Out

4 - Clock / Clock

5 - MCLR (not) / Data In

6 - +5V / n/a

BALANCED

PROGRAM

INPUT

ALER

T

T

ONE

VOLUME

PROGRAM

VOLUME

CW

CW

VOLUME

CW

MIN.

VOLUME

(INTERNAL)

CW

NOTES:  (UNLESS OTHER

WISE SPECIFIED)

T

ALK

CALL

LIGHT

TW POWER

OPTION

4-WIRE

OPTION (2)

INTERCOM

CHANNEL

4-WIRE

OPTION

(1)