GB901887A - Improvements relating to electronic counting chains - Google Patents
Improvements relating to electronic counting chainsInfo
- Publication number
- GB901887A GB901887A GB273359A GB273359A GB901887A GB 901887 A GB901887 A GB 901887A GB 273359 A GB273359 A GB 273359A GB 273359 A GB273359 A GB 273359A GB 901887 A GB901887 A GB 901887A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stage
- stages
- lead
- operate
- controlled
- 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
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/002—Pulse counters comprising counting chains; Frequency dividers comprising counting chains using semiconductor devices
Landscapes
- Safety Devices In Control Systems (AREA)
Abstract
901,887. Electrical counting circuits. WESTINGHOUSE BRAKE & SIGNAL CO. Ltd. Jan. 26, 1960 [Jan. 26, 1959], No. 2733/59. Class 106 (1). To ensure proper operation of a ring counter, e.g. in a railway signalling system, even though one of the stages fails, each stage is prepared for operation by two of the preceding stages. In Fig. 1 stepping pulses are applied alternately to leads S1 S2. Operation of either stage A or stage B restores stage C so that the next stepping pulse on lead S1 reoperates C. Failure of either A or B then has no effect on the proper operation of C. In Fig. 2; stepping pulses are applied in turn to leads S1-S4 to operate stages AD. Stage E is controlled by A and B, C and D in pairs and failure of any one of A-D either to operate or release has no ill effect on E. A pulse applied over lead RL either to all the stages or only to the first four restores all stages. Fig. 3 shows the invention applied to the disclosure in Specification 901,886 in which an auxiliary transistor TR3C controlled by the preceding stage B is augmented by another transistor TR4C controlled by the next preceding stage A. To ensure that the stepping pulse on lead S1 which operates stage A shall not also operate stage C, the control lead between the stages includes a capacity delay RCA2. Specification 891,533 also is referred to.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB273359A GB901887A (en) | 1959-01-26 | 1959-01-26 | Improvements relating to electronic counting chains |
| FR816552A FR1246002A (en) | 1959-01-26 | 1960-01-25 | Improvements to electronic counting chains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB273359A GB901887A (en) | 1959-01-26 | 1959-01-26 | Improvements relating to electronic counting chains |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB901887A true GB901887A (en) | 1962-07-25 |
Family
ID=9744868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB273359A Expired GB901887A (en) | 1959-01-26 | 1959-01-26 | Improvements relating to electronic counting chains |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1246002A (en) |
| GB (1) | GB901887A (en) |
-
1959
- 1959-01-26 GB GB273359A patent/GB901887A/en not_active Expired
-
1960
- 1960-01-25 FR FR816552A patent/FR1246002A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1246002A (en) | 1960-11-10 |
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