LS1240A(2005) Просмотр технического описания (PDF) - Unisonic Technologies

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Компоненты Описание

производитель

LS1240A
(Rev.:2005)

ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER

Unisonic Technologies 

LS1240A

BLOCK DIAGRAM

LINEAR INTEGRATED CIRCUIT

TELEPHONE 1

LINE

2

GND

RECTIFIER

IN BRIDGE IN

8

TELEPHONE

LINE

7

RECTIFIER

CAPACITOR

SWEEP RATE

3

CONTROL CAPACITOR

SWITCHING

FREQUENCY

GENERATOR

THRESHOLD

CIRCUIT

WITH

HYSTERESIS

6 N.C.

4

OUTPUT FREQYENCY

CONTROL RESISTOR

NONE

FREQUENCY

GENERATOR

OUTPUT

STAGE

5

BUZZER

TEST CIRCUIT

1 µF

2.2kΩ

8

5

VAB

7 UTC LS 1240A RL Vout

10 µF

1

23

4

R1

C1 14kΩ

100nF

R1= 27200 *(1-0.04 In f1

f1(Hz)

1943

) f2=0.725f1

fSWEEP

=

750

C1(nF)

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

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