GB1129186A - Improvements in or relating to electric timing circuits - Google Patents
Improvements in or relating to electric timing circuitsInfo
- Publication number
- GB1129186A GB1129186A GB2600266A GB2600266A GB1129186A GB 1129186 A GB1129186 A GB 1129186A GB 2600266 A GB2600266 A GB 2600266A GB 2600266 A GB2600266 A GB 2600266A GB 1129186 A GB1129186 A GB 1129186A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- capacitor
- switching device
- relay
- closed
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/08—Indicating faults in circuits or apparatus
- H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Relay Circuits (AREA)
Abstract
1,129,186. Transistor time delay circuits; automatic exchange equipment. GENERAL ELECTRIC CO. Ltd. 6 June, 1967 [10 June, 1966], No. 26002/66. Headings H3T and H4K. A timing circuit comprises a capacitor which, when a pair of contacts is closed, discharges towards a value at which a transistor conducts whereby an electromagnetic relay is operated by the transistor only if the contacts remain closed for longer than a predetermined period. The circuit is suitable for detecting pauses in pulse trains signalling digit values of telephone numbers. When switching device 1 is open, transistor 2 is not conducting and capacitor 8 charges through resistor 6 to the difference between the supply voltage and the voltage across a Zener diode 12. The switching device closes between input pulses and the capacitor then commences to discharge through resistor 10 and the switching device. If the latter remains closed for long enough, i.e. between pulse trains but not between pulses of a train, the capacitor charges sufficiently to render diode 9 and transistor 2 conductive so that relay 15 is operated. Device 1 may be a relay contact, a transistor, a thyristor or a valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2600266A GB1129186A (en) | 1966-06-10 | 1966-06-10 | Improvements in or relating to electric timing circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2600266A GB1129186A (en) | 1966-06-10 | 1966-06-10 | Improvements in or relating to electric timing circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1129186A true GB1129186A (en) | 1968-10-02 |
Family
ID=10236797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2600266A Expired GB1129186A (en) | 1966-06-10 | 1966-06-10 | Improvements in or relating to electric timing circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1129186A (en) |
-
1966
- 1966-06-10 GB GB2600266A patent/GB1129186A/en not_active Expired
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