Electronic component search and free download site.
Transistors,MosFET ,Diode,Integrated circuits
English
한국어
日本語
русский
简体中文
español
Part Name
Description
E-LS1240A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
E-LS1240A
Electronic two-tone ringer
STMicroelectronics
E-LS1240A Datasheet PDF : 9 Pages
1
2
3
4
5
6
7
8
9
Block diagram and test circuit
1
Block diagram and test circuit
Figure 1. LS1240 block diagram
Telephone
line
8
Rectifier
capacitor
7
N.C.
6
Rectifier
bridge
+
Threshold circuit
with hysteresis
-
Buzzer
5
Output
stage
LS1240
Switching
frequency
)
generator
ct(s
1
du
Telephone
ro
line
2
GND
3
Sweep rate
control capacitor
te
P
Figure 2. Test circuit
Tone frequency
generator
4
Output frequency
control resistor
Obsolete
Product(s) - Obsole
R1
=
2.72
⋅
10
4
f1
(
Hz
)
⋅
(
1
−
0.04
ln
19f143
)
f2 = 0.725 f1
f
SWEEP
=
750
C1
(
nF
)
2/9
Share Link:
datasheetq.com [
Privacy Policy
]
[
Request Datasheet
] [
Contact Us
]