Telephone Tester projects

Electronics Infoline Web

Line Status Indicator

http://www.web-ee.com/Schematics/Telco%20Status%20Indicator/telco_status.htm

can be used to alarm security system.

http://www.aaroncake.net/circuits/phonecut.htm

http://www.electronic-circuits-diagrams.com/telephonesimages/telephonesckt16.shtml

get telephone audio to mixer or send audio to telephone.

http://www.tkk.fi/Misc/Electronics/circuits/telephone_test.html

http://home.maine.rr.com/randylinscott/jun99.htm

simple busy indicator

http://www.aaroncake.net/circuits/phonbusy.htm

http://margo.student.utwente.nl/el/phone/voicemail.zip

http://margo.student.utwente.nl/el/phone/phon_use.zip