Loop detector 5V logic high

NorthwesternTelephoneandTelegraph
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Published: May 13, 2018 Complete

Project Description

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Project description
Tip input tolerates Vp=250V referenced to G; S in {T<-5.5V: 5V, 0V} referenced to G. Will tolerate ringing to below 15Hz.
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Component (10)
Qty
Description
RK73B1JTTD226J

R3, R4, R2

3
Resistor 22M 5% 1/10w
885012206094

C1

1
MLCC 0.068uF 50V 10%
SML-LX1206GC-TR1

D4

1
Green LED
RK73B1JTTDD241J

R5

1
Thick Film Resistors - SMD 240 OHM 5%

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