Phone in use indicator 5

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—————–+——+—->> phone line                     |      |                     |      o                     |       /                     |      /   momentary switch                     |      |                     |      /                     |      \   1200 Ohm                     |      /                   —–_|                    / \                   /\  SCR                     |                     /                     \  600 Ohm                     /                     |     ^^                   —–  //                    / \  //                   /___\    LED                     |                     |  >>—————–+———>> phone line

Sources

  • Terri Barber barber[at]beowulf.ucsd.edu

Category:Telephone

 

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