GB1264004A - Double current telegraph signal transmitter - Google Patents
Double current telegraph signal transmitterInfo
- Publication number
- GB1264004A GB1264004A GB2324069A GB2324069A GB1264004A GB 1264004 A GB1264004 A GB 1264004A GB 2324069 A GB2324069 A GB 2324069A GB 2324069 A GB2324069 A GB 2324069A GB 1264004 A GB1264004 A GB 1264004A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- conductive
- terminals
- transistor
- supply
- 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
- 239000003990 capacitor Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/24—Relay circuits using discharge tubes or semiconductor devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electronic Switches (AREA)
Abstract
1,264,004. Telegraphy; transistor switching circuits. CREED & CO. Ltd. 7 May, 1969, No. 23240/69. Headings H3T and H4P. In a circuit having two electronic switches serially connected across the positive and negative terminals of a power supply to generate double current signals in response to telegraph signals, it is arranged that only one switch can be conductive at any one time to prevent shortcircuiting the supply and to avoid the need for a current limiting resistor. Telegraph signals, Figs. 2A, 2B (not shown), at terminals 1 are passed in true and invert form from transistor 41 to gates 37, 38. Capacitors 35, 36 increase the rise time of the signals, Figs. 2E, 2F (not shown), fed to the gates so that one gate is rendered non-conductive prior to the other being rendered conductive. Pulses from oscillator 17 pass via the conductive gate 37 or 38 and transformer 12 or 15, and are rectified at 13, 16, the resulting signals controlling transistor switches 34 connected across the supply terminals 8, 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2324069A GB1264004A (en) | 1969-05-07 | 1969-05-07 | Double current telegraph signal transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2324069A GB1264004A (en) | 1969-05-07 | 1969-05-07 | Double current telegraph signal transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1264004A true GB1264004A (en) | 1972-02-16 |
Family
ID=10192439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2324069A Expired GB1264004A (en) | 1969-05-07 | 1969-05-07 | Double current telegraph signal transmitter |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1264004A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4412141A (en) | 1980-12-16 | 1983-10-25 | General Datacomm Industries, Inc. | Three state loop keyer |
| GB2262673A (en) * | 1991-12-09 | 1993-06-23 | Abb Stroemberg Drives Oy | Control circuit for a semiconductor switch |
-
1969
- 1969-05-07 GB GB2324069A patent/GB1264004A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4412141A (en) | 1980-12-16 | 1983-10-25 | General Datacomm Industries, Inc. | Three state loop keyer |
| GB2262673A (en) * | 1991-12-09 | 1993-06-23 | Abb Stroemberg Drives Oy | Control circuit for a semiconductor switch |
| GB2262673B (en) * | 1991-12-09 | 1995-08-02 | Abb Stroemberg Drives Oy | A switching circuit for a semiconductor switch |
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