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Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Chayt, Kenneth A.
Attorney: Cannon; Russell A.

Next ten patents ordered by date:

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Title: Ringer power generator circuit for carrier subscriber station terminal

Abstract: A ringer-power generator circuit is provided in which ring pulses cause positive and negative output voltages of a swinging choke regulator to be alternately connected to one of the tip and ring lines of a handset; and cause a control circuit to be alternately connected to and disconnected from a supply voltage. The control circuit has an RC timing circuit which delays initial turn on of the regulator to prevent bell tapping, and includes a transistor, diodes and timing circuit which control maximum output power and maximum output voltage of the regulator for causing the latter to essentially operate as a voltage limited high impedance source.

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Inventors: Stewart, James A. (Menlo Park, CA, US)

Application Number: 827529
Filing Date: 1977-08-25
Publication_date: 1979-05-01
Assignee: GTE Automatic Electric Laboratories, Inc. (Northlake, IL)
Primary Class(es): 340/384.7 363/19, 379/418, 455/400
Other Classes:
US Patent Ref:

3302130	Jan, 1967	Minks	363/18.
3510584	May, 1970	Krasin et al.	179/2.
3886321	May, 1975	Krasin et al.	179/84.
3904833	Sep, 1975	Beene et al.	179/84.
3927266	Dec, 1975	Stewart et al.	179/2.

Other Refs: Other References: "Transistor Manual", General Electric Co., Seventh Edition, 1969, p. 52.