Electricity: electrical systems and devices – Miscellaneous
Patent
1988-11-02
1991-01-15
Thompson, Gregory D.
Electricity: electrical systems and devices
Miscellaneous
338334, 379398, 361397, H01R 909
Patent
active
049858084
ABSTRACT:
A printed circuit or printed wire board has a resistor network thereon, wired through conductors that are arranged so that individual circuit paths for different resistor combinations pass onto one of a plurality of peripheral tabs on the printed circuit board. The tabs are joined to the main portion of the circuit board through a frangible connection which permits breaking off the tabs. The main circuit into which the board is to be connected is tested to determine the needed circuit characteristics, and all but one of the tabs on the board are removed to provide the required circuit connections for matching the printed wire board circuit to the main circuit. The breakaway tabs permit selecting a particular circuit impedance so that the board is matched to the main circuit in which it is connected. The board is primarily used for compensation of a communications network where the loop loss of a telephone system is set to the right value.
REFERENCES:
patent: 4016463 (1977-04-01), Beall et al.
patent: 4216523 (1980-08-01), Harford
patent: 4227238 (1980-10-01), Saito
Communications Systems, Inc.
Thompson Gregory D.
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