AU461765B2 - A SOLID STATE BELL ringing system - Google Patents
A SOLID STATE BELL ringing systemInfo
- Publication number
- AU461765B2 AU461765B2 AU38669/72A AU3866972A AU461765B2 AU 461765 B2 AU461765 B2 AU 461765B2 AU 38669/72 A AU38669/72 A AU 38669/72A AU 3866972 A AU3866972 A AU 3866972A AU 461765 B2 AU461765 B2 AU 461765B2
- Authority
- AU
- Australia
- Prior art keywords
- solid state
- bell ringing
- ringing system
- state bell
- solid
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US170927A US3868683A (en) | 1971-08-11 | 1971-08-11 | Solid state bell ringing system |
USUS170,927 | 1971-08-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
AU3866972A AU3866972A (en) | 1973-08-09 |
AU461765B2 true AU461765B2 (en) | 1975-05-15 |
Family
ID=22621838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU38669/72A Expired AU461765B2 (en) | 1971-08-11 | 1972-02-04 | A SOLID STATE BELL ringing system |
Country Status (2)
Country | Link |
---|---|
US (1) | US3868683A (en) |
AU (1) | AU461765B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4103258A (en) * | 1976-03-18 | 1978-07-25 | Mitsubishi Denki Kabushiki Kaisha | Pulse generator including a capacitor which is discharged through a thyristor |
US4628213A (en) * | 1985-08-09 | 1986-12-09 | General Signal Corporation | Electronic circuits for driving bells or electromagnetic devices |
KR960003660B1 (en) * | 1993-07-24 | 1996-03-21 | 국방과학연구소 | Electric-optical q-switching drive-circuit for photoprism laser resonator |
AU718281B2 (en) * | 1998-03-25 | 2000-04-13 | Robert Bosch Gmbh | A drive circuit for a sounder |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2759179A (en) * | 1952-12-05 | 1956-08-14 | Bell Telephone Labor Inc | Ringing circuit |
US2723386A (en) * | 1954-05-05 | 1955-11-08 | Bendix Aviat Corp | Sonic transducer with mechanical motion transformer |
NL283356A (en) * | 1961-09-18 | |||
GB989232A (en) * | 1961-12-08 | 1965-04-14 | Post Office | Improvements in or relating to signalling circuits |
US3506881A (en) * | 1966-12-12 | 1970-04-14 | Thomas P Leary | Variable time interval cable release for motion picture cameras |
US3593185A (en) * | 1969-04-17 | 1971-07-13 | Raven Ind Inc | Temperature-compensated unijunction transistor relaxation oscillator with switched reference voltage |
US3601714A (en) * | 1970-02-11 | 1971-08-24 | Gen Motors Corp | Unijunction relaxation oscillator providing linear potential to frequency conversion |
-
1971
- 1971-08-11 US US170927A patent/US3868683A/en not_active Expired - Lifetime
-
1972
- 1972-02-04 AU AU38669/72A patent/AU461765B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3868683A (en) | 1975-02-25 |
AU3866972A (en) | 1973-08-09 |
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