GB1317134A - Telegraph transmitting device - Google Patents
Telegraph transmitting deviceInfo
- Publication number
- GB1317134A GB1317134A GB1317134DA GB1317134A GB 1317134 A GB1317134 A GB 1317134A GB 1317134D A GB1317134D A GB 1317134DA GB 1317134 A GB1317134 A GB 1317134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- telegraph
- resistor
- current
- double
- 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
- 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
- H04L25/22—Repeaters for converting two wires to four wires; Repeaters for converting single current to double current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
- H03K17/66—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will
- H03K17/665—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will connected to one load terminal only
- H03K17/666—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will connected to one load terminal only the output circuit comprising more than one controlled bipolar transistor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
1317134 Double current telegraph amplifier CREED & CO Ltd 13 April 1972 17060/72 Heading H3T A telegraph double-current amplifier responds to the magnitude of an input signal to send positive or negative pulses along a telegraph line L connected between zero potential and the joined collector-emitters of two like conductivity transistors T 1 , T 2 whose collectoremitter paths are in series between positive and negative supply lines. The transistors conduct alternately only; means being provided to ensure this such as a transformer T R1 having one secondary S1 connected between zero potential and the base of transistor T 1 via an envelope detector circuit and the other secondary connected between the collector and base of the transistor T 2 . In operation small input signals do not turn on transistor T 1 but permit the transistor T 2 to be turned on by current flowing via the line L and resistor R 2 . Large signals turn transistor T 1 on but produce a bias across resistor R 2 to oppose the current flowing through the load at the resistor so preventing transistor T 2 from conducting. A centre tapped battery may be used in place of two separate supplies t 1 , t 2
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1706072 | 1972-04-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1317134A true GB1317134A (en) | 1973-05-16 |
Family
ID=10088549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1317134D Expired GB1317134A (en) | 1972-04-13 | 1972-04-13 | Telegraph transmitting device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1317134A (en) |
-
1972
- 1972-04-13 GB GB1317134D patent/GB1317134A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |