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DiscoverCircuits.com  --   Dave's Circuits
Circuits designed by David Johnson, P.E.

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Last Updated on:  06/17/2009 03:29:06 PM

Indicator Circuits

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2 LINE TELEPHONE LINE STATUS INDICATOR
Many home businesses use multiple phone lines. This circuit gives you a visual indication when a line is in operation. The two AA battery cells should provide enough power for about one year of operation. The circuit is line polarity insensitive.
 

Circuit 2 Line Phone Statue Indicator designed by David A. Johnson, P.E.
 

Indicator Circuits
Master Schematic Category List - David A. Johnson, P.E.

 
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