A simple circuit that flashes an LED when the phone rings -- with an alternate version that closes a relay when the phone rings.
http://www.circuitstoday.com/ringing-phone-light-flasher
and this kit gives an excellent schematic of how to do this: http://www.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k8086.pdf
http://www.circuitstoday.com/ringing-phone-light-flasher
and this kit gives an excellent schematic of how to do this: http://www.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k8086.pdf
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