Power supply for key telephone system

Details Power supply for key telephone system Power supply for key telephone system

1974-04-24

1976-02-24

Brown, Thomas W.

317 33VR, H04M 1900

Patent

active

039405729

ABSTRACT:
A power supply for a key telephone system provides regulated dc for the talk and relay circuits and various ac voltages for buzzer, lamp and ringer signaling. The power supply visually indicates dc overload, and at the same time provides effective voltage regulation and is compact in size by the use of foldback current limiting.

REFERENCES:
patent: 3366871 (1968-01-01), Connor
patent: 3691426 (1972-09-01), Mankovitz
patent: 3721894 (1973-03-01), Beckwith
patent: 3743887 (1973-07-01), Keough et al.
patent: 3748403 (1973-07-01), Schartmann et al.
patent: 3764752 (1973-10-01), Yachabach
patent: 3801894 (1974-04-01), Spiegel

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