IES950210A2 - A ringing voltage trigger circuit - Google Patents

A ringing voltage trigger circuit

Info

Publication number
IES950210A2
IES950210A2 IES950210A IES950210A2 IE S950210 A2 IES950210 A2 IE S950210A2 IE S950210 A IES950210 A IE S950210A IE S950210 A2 IES950210 A2 IE S950210A2
Authority
IE
Ireland
Prior art keywords
transistor
pin
trigger circuit
telephone line
ringing signal
Prior art date
Application number
Inventor
Karl Pawley
Michael O Dwyer
Caoimhin O Laoi
Original Assignee
Lake Electronic Tech
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lake Electronic Tech filed Critical Lake Electronic Tech
Priority to IES950210 priority Critical patent/IES65388B2/en
Publication of IES950210A2 publication Critical patent/IES950210A2/en
Publication of IES65388B2 publication Critical patent/IES65388B2/en
Priority to IE960235A priority patent/IE960235A1/en
Priority to GB9606214A priority patent/GB2299244B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

A trigger circuit for applying a voltage to a ring supply pin (2) of a speech chip (3) for activating a ringer (11) of a system phone in response to a ringing signal being applied to a telephone line (4) from a PBX. The trigger circuit (1) comprises first and second bridge rectifier (8) and (9). The ring supply pin (2) is fed through a transistor (T1) from the second rectifier circuit (9). A smoothing capacitor (C4) biases the base of the transistor (T1) through a potential divider (R1,R2) for switching on the transistor (T1) on a ringing signal appearing on the telephone line (4). A voltage control circuit (12) provided between the transistor (T1) and the pin (2) which comprises a smoothing capacitor (C3) and a zener diode (ZD1) regulate and maintain the voltage being applied to the pin (2) at a level sufficient to hold the pin 2 on for so long as a ringing signal is being applied to the telephone line (4).
IES950210 1995-03-24 1995-03-24 A ringing voltage trigger circuit IES65388B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IES950210 IES65388B2 (en) 1995-03-24 1995-03-24 A ringing voltage trigger circuit
IE960235A IE960235A1 (en) 1995-03-24 1996-03-21 A ringing voltage trigger circuit
GB9606214A GB2299244B (en) 1995-03-24 1996-03-25 A ringing voltage trigger circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IES950210 IES65388B2 (en) 1995-03-24 1995-03-24 A ringing voltage trigger circuit

Publications (2)

Publication Number Publication Date
IES950210A2 true IES950210A2 (en) 1995-10-18
IES65388B2 IES65388B2 (en) 1995-10-18

Family

ID=11040692

Family Applications (1)

Application Number Title Priority Date Filing Date
IES950210 IES65388B2 (en) 1995-03-24 1995-03-24 A ringing voltage trigger circuit

Country Status (2)

Country Link
GB (1) GB2299244B (en)
IE (1) IES65388B2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183423B (en) * 1985-11-23 1989-10-04 Stc Plc Telephone tone caller
KR920001410B1 (en) * 1989-04-26 1992-02-13 삼성전자 주식회사 Ring generating circuit
IE74186B1 (en) * 1990-10-23 1997-07-16 Lake Electronic Tech A speech and ringer volume attenuation control circuit for a telephone

Also Published As

Publication number Publication date
GB2299244A (en) 1996-09-25
GB2299244B (en) 1999-04-21
GB9606214D0 (en) 1996-05-29
IES65388B2 (en) 1995-10-18

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Legal Events

Date Code Title Description
MM4A Patent lapsed