GB546205A - Improvements in or relating to electrical impedance networks - Google Patents
Improvements in or relating to electrical impedance networksInfo
- Publication number
- GB546205A GB546205A GB1825340A GB1825340A GB546205A GB 546205 A GB546205 A GB 546205A GB 1825340 A GB1825340 A GB 1825340A GB 1825340 A GB1825340 A GB 1825340A GB 546205 A GB546205 A GB 546205A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- networks
- drum
- plunger
- chain
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/24—Frequency- independent attenuators
Landscapes
- Structure Of Telephone Exchanges (AREA)
Abstract
546,205. Attenuating networks. STANDARD TELEPHONES & CABLES, Ltd., BARNARD, R. M., JARVIS, F. L. J., WICKS, G. R., and KRAM, W. Dec. 31, 1940, No. 18253. [Class 40 (iii)] A variable attenuator comprises a series of T- networks arranged radially in a fixed drum 1 and connected at their lower ends to a short circular bus-bar 19. Each network is normally connected to its neighbour by a plunger 26 and the chain is broken at the selected point by the release of a plunger as at 29 by a cam ring secured to a plate 2 rotated by the selecting handle. Connection of the output conductor to the selected point in the chain is effected by a collector arm terminating at each end in spring-loaded plungers 31, 32, carried by the plate 2. The networks and their connections are screened individually by partition members 12, 13 and collectively by a plate 34 and drum 1. Unused contact studs are shielded by the plate 2. Definite selecting positions are provided for by balls 37 cooperating with recesses 39 in the drum 1 to which the plate is held by a spring. Specifications 514,454 and 520,289 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1825340A GB546205A (en) | 1940-12-31 | 1940-12-31 | Improvements in or relating to electrical impedance networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1825340A GB546205A (en) | 1940-12-31 | 1940-12-31 | Improvements in or relating to electrical impedance networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB546205A true GB546205A (en) | 1942-07-02 |
Family
ID=10109281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1825340A Expired GB546205A (en) | 1940-12-31 | 1940-12-31 | Improvements in or relating to electrical impedance networks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB546205A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2536501A (en) * | 1946-04-29 | 1951-01-02 | Amalgamated Wireless Australas | Attenuator for electric circuits |
| US2597090A (en) * | 1949-05-19 | 1952-05-20 | Daven Company | Variable attenuator |
| US3014187A (en) * | 1960-05-16 | 1961-12-19 | United Telecontrol Electronics | Variable step attenuator |
-
1940
- 1940-12-31 GB GB1825340A patent/GB546205A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2536501A (en) * | 1946-04-29 | 1951-01-02 | Amalgamated Wireless Australas | Attenuator for electric circuits |
| US2597090A (en) * | 1949-05-19 | 1952-05-20 | Daven Company | Variable attenuator |
| US3014187A (en) * | 1960-05-16 | 1961-12-19 | United Telecontrol Electronics | Variable step attenuator |
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