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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, November 17, 2017 06:32 AM

List of Dave's Circuit Designs

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More  Indicator Circuits    LEDs  
 Micro Power Circuits    Telephone Circuits

1 LINE TELEPHONE LINE STATUS INDICATOR


This circuit is similar to the above circuit, but only monitors one phone line.

Click on Drawing Below to view PDF version of Schematic

Circuit Phone Line Status Light designed by David Johnson, P.E.



More  Indicator Circuits    LEDs  
 Micro Power Circuits    Telephone Circuits

Dave's Circuits


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