IES950210A2 - A ringing voltage trigger circuit - Google Patents
A ringing voltage trigger circuitInfo
- 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
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).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IES950210 IES950210A2 (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 IES950210A2 (en) | 1995-03-24 | 1995-03-24 | A ringing voltage trigger circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
IES65388B2 IES65388B2 (en) | 1995-10-18 |
IES950210A2 true IES950210A2 (en) | 1995-10-18 |
Family
ID=11040692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IES950210 IES950210A2 (en) | 1995-03-24 | 1995-03-24 | A ringing voltage trigger circuit |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2299244B (en) |
IE (1) | IES950210A2 (en) |
Family Cites Families (3)
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 |
-
1995
- 1995-03-24 IE IES950210 patent/IES950210A2/en not_active IP Right Cessation
-
1996
- 1996-03-25 GB GB9606214A patent/GB2299244B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
IES65388B2 (en) | 1995-10-18 |
GB2299244B (en) | 1999-04-21 |
GB9606214D0 (en) | 1996-05-29 |
GB2299244A (en) | 1996-09-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Patent lapsed |