Phone busy indicator


 Sometimes it often happens that a telephone line being shared by several telephone sets to lift one of them to make a call we find that the line is being used either by another person, a fax or modem.  To avoid these problems and still maintain good character, it will be helpful to place a device that tells us when the line is being used by another person or apparatus.

Schematic of the Phone Busy indicator Livewire

Electronic simulation with Livewire

Circuit Phone Busy indicator simulated livewire




Printed circuit with PCB Wizard

   Printed circuit of the Phone Busy indicator

   

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