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LS1240 Datenblatt(PDF) 2 Page - STMicroelectronics

Teilenummer LS1240
Bauteilbeschribung  Electronic two-tone ringer
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LS1240 Datenblatt(HTML) 2 Page - STMicroelectronics

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Obsolete
Product(s)
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Product(s)
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Block diagram and test circuit
LS1240
2/9
1
Block diagram and test circuit
Figure 1.
LS1240 block diagram
Figure 2.
Test circuit
Rectifier
bridge
Threshold circuit
with hysteresis
Output
stage
Tone frequency
generator
Switching
generator
frequency
8
7
6
5
4
3
2
1
Telephone
line
Rectifier
capacitor
N.C.
Buzzer
Output frequency
control resistor
Sweep rate
control capacitor
GND
Telephone
line
+
-
R1
=
2.72
⋅ 10
4
f1
(Hz)
⋅ (1 − 0.04 ln
f1
1943)
f2 = 0.725 f1
fSWEEP
=
750
C1
(nF)


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