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Part Name
Description
LS1240A View Datasheet(PDF) - Unisonic Technologies
Part Name
Description
Manufacturer
LS1240A
ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
Unisonic Technologies
LS1240A Datasheet PDF : 5 Pages
1
2
3
4
5
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
1F
2.2k
8
5
V
AB
7
UTC LS1240A
RL
Vout
10 F
1
2
3
4
R1
C1 14k
100nF
27200
f1
R1=
*(1-0.04 In
f1(Hz)
1943
)
f2=0.725f1
f
SWEEP
=
750
C1(nF)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 5
QW-R108-002.I
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