FR1287248A - Circuit for a speaker phone system - Google Patents
Circuit for a speaker phone systemInfo
- Publication number
- FR1287248A FR1287248A FR860009A FR860009A FR1287248A FR 1287248 A FR1287248 A FR 1287248A FR 860009 A FR860009 A FR 860009A FR 860009 A FR860009 A FR 860009A FR 1287248 A FR1287248 A FR 1287248A
- Authority
- FR
- France
- Prior art keywords
- circuit
- phone system
- speaker phone
- speaker
- phone
- 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
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/34—DC amplifiers in which all stages are DC-coupled
- H03F3/343—DC amplifiers in which all stages are DC-coupled with semiconductor devices only
- H03F3/345—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices
- H03F3/3455—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with field-effect devices with junction-FET's
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
- H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
- H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
- H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
- H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Electronic Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA701637T | |||
GB20034/59A GB950182A (en) | 1959-06-11 | 1959-06-11 | Improvements in and relating to electrical circuits employing transistor networks |
NL250981 | 1960-04-28 | ||
NL1127407X | 1960-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR1287248A true FR1287248A (en) | 1962-03-09 |
Family
ID=76269552
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR829644A Expired FR1259724A (en) | 1959-06-11 | 1960-06-10 | Transistor networks for the detection of electrical signal levels |
FR860009A Expired FR1287248A (en) | 1959-06-11 | 1961-04-27 | Circuit for a speaker phone system |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR829644A Expired FR1259724A (en) | 1959-06-11 | 1960-06-10 | Transistor networks for the detection of electrical signal levels |
Country Status (6)
Country | Link |
---|---|
JP (3) | JPS384353B1 (en) |
CA (1) | CA701637A (en) |
DE (2) | DE1141333B (en) |
FR (2) | FR1259724A (en) |
GB (3) | GB950182A (en) |
NL (1) | NL250981A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH407212A (en) * | 1963-08-29 | 1966-02-15 | Siemens Ag Albis | Amplitude discriminator with a bistable circuit |
US3373295A (en) * | 1965-04-27 | 1968-03-12 | Aerojet General Co | Memory element |
SE435679B (en) * | 1980-09-17 | 1984-10-15 | Landskrona Finans Ab | STIMULATOR SYSTEM, INCLUDING ONE OF A RECHARGEABLE BATTERY DRIVE PULSE GENERATOR |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1048946B (en) * | 1957-07-19 | 1959-01-22 | Siemens Ag | Circuit arrangement for controlling the power supply to a consumer with, in particular, an inductive reactance component by means of a transistor |
-
0
- NL NL250981D patent/NL250981A/xx unknown
- CA CA701637A patent/CA701637A/en not_active Expired
-
1959
- 1959-06-11 GB GB20034/59A patent/GB950182A/en not_active Expired
- 1959-06-11 GB GB39319/63A patent/GB950183A/en not_active Expired
- 1959-08-27 JP JP2750859A patent/JPS384353B1/ja active Pending
-
1960
- 1960-06-10 DE DEE19460A patent/DE1141333B/en active Pending
- 1960-06-10 FR FR829644A patent/FR1259724A/en not_active Expired
- 1960-06-10 JP JP2719260A patent/JPS384354B1/ja active Pending
-
1961
- 1961-04-25 GB GB14915/61A patent/GB936756A/en not_active Expired
- 1961-04-25 DE DEN19939A patent/DE1127407B/en active Pending
- 1961-04-27 FR FR860009A patent/FR1287248A/en not_active Expired
-
1963
- 1963-04-22 JP JP1952163A patent/JPS3819521B1/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
GB936756A (en) | 1963-09-11 |
NL250981A (en) | |
JPS384353B1 (en) | 1963-02-24 |
GB950183A (en) | 1964-02-19 |
DE1141333B (en) | 1962-12-20 |
GB950182A (en) | 1964-02-19 |
FR1259724A (en) | 1961-04-28 |
CA701637A (en) | 1965-01-12 |
JPS3819521B1 (en) | 1963-09-26 |
DE1127407B (en) | 1962-04-12 |
JPS384354B1 (en) | 1963-04-24 |
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