Clip extracts signal from phone line


Posted on Sep 21, 2012

For this scheme to have satisfactory signal-to-noise and frequency-response parameters, the clip, connecting cable, and amplifier must m be attached parallel to the signal wire and must be as long as is conveniently possiblean inch or moreand preferably slightly curved to maximize the coupling capacitance. (For a twisted-conductor line, the plates should not be longer than the twist `wavelength` to avoid signal cancellation.) You should orient the clip for the cleanest signal output. The clip, its connecting cable, and the amplifier must be shielded to minimize interference, typically comprising 60-Hz signals and their harmonics from powerline fields. The cable should have good electrical symmetry and low total capacitance between conductors and to the shield. Thus, the amplifier must be near the clip. The amplifier should have high input resistance, low current noise, and adequate common-mode rejection.






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