Shadyswitch tone plant v1.0

NorthwesternTelephoneandTelegraph
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Quasi-functional
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Shadyswitch tone plant v1.1
Shadyswitch tone plant v1.1

NorthwesternTelephoneandTelegraph

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Published: September 4, 2017 Complete

Project Description

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Project description
Do not use; Mfr. Disc. This one requires that the 12V line have a supply voltage of about 10.7V and the tone request lines about 12V, but does not compute these voltages. The LEDs are then overdriven by over 200%.
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Component (14)
Qty
Description
VJ0805V225MXJTW1BC

C4

1
MLCC - SMD/SMT 0805 2.2uF 16volts Y5V 20%
ERJ-3GEYJ683V

R2, R3, R4

3
SMD 0603 68Kohms 5% AEC-Q200
MM4148

D4, D1, D3, D2

4
75V 500mA SMT diode
GRM155R71C224KA12D

C1, C2

2
MLCC - SMD/SMT 0402 0.22uF 16volt X7R +/-10%

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