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Calling Bell Using An Intercom

Calling Bell Using An Intercom

10

9

1

2

4

6

7

3,8

g

f

e

d

c

b

a

14

16

10

12

IC2

7447

15

9

1

7

8

11

13

5

A

B

g

f

e

d

c

b

a

6

2

C

D

4

3

17

11

13

IC1

MT8870

8

7

12

14

Q0

Q1

Q2

Q3

4

1

10

18

16

3

2

5

6

9

2

8

6

3

1

5

4

IC4

NE555

TH

GND

7

DIS

O/P

T

4

2

5

1

TH

7

8

3

7

6

1

5

4

IC5

NE555

O/P

GND

Vcc

DIS

T

BELL

+

+

1

2

S2 (b)

1

2

P1

P2

S1 (a)

5V

S1

PUSH-TO-OFF SWITCH

XTAL

3.579545MHZ

R1

10K

C1

0.1μ

R2

150K

TIP

TELEPHONE

LINE

RING

GND

C3

0.1μ

100V

S2 = S2 (a), S2(b) = DPDT SWITCH

R11

220Ω

IC3

MCT

2E

T1

BC548

R14

4.7K

C4

0.01μ

C5

10μ

16V

C6

220μ

16V

C7

0.01μ

VR1

220K

R15

220K

R16

10K

R13

10K

D1

1N4007

T2

BC548

L

230V AC

50HZ

N

R17

10K

DIS1 = LTS542 COMMON-ANODE 7-SEGMENT DISPLAY

R10

470Ω

DIS1

LTS542

R4

470Ω

C2

0.1μ

R3

390K

TELEPHONE

RL1

5V, 1C/O

RELAY

N/O

N/C

Calling Bell Using An Intercom

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publish time: 2020-09-28
Circuit Everyday

This is a simple call bell circuit that can be used in small offices. By using the existing intercom system, up to nine extensions can call the office. Whenever someone needs help from the "office boy", he can dial the extension number of the "office boy" intercom by the following method, and then press a key to indicate its location number.

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