GB849530A - Telephone apparatus employing transistor amplifiers - Google Patents

Telephone apparatus employing transistor amplifiers

Info

Publication number
GB849530A
GB849530A GB35707/57A GB3570757A GB849530A GB 849530 A GB849530 A GB 849530A GB 35707/57 A GB35707/57 A GB 35707/57A GB 3570757 A GB3570757 A GB 3570757A GB 849530 A GB849530 A GB 849530A
Authority
GB
United Kingdom
Prior art keywords
amplifier
transistor
subscriber
nov
resistor
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
Application number
GB35707/57A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Telephone Laboratories Inc
Original Assignee
General Telephone Laboratories Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Telephone Laboratories Inc filed Critical General Telephone Laboratories Inc
Publication of GB849530A publication Critical patent/GB849530A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
GB35707/57A 1956-11-28 1957-11-15 Telephone apparatus employing transistor amplifiers Expired GB849530A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US358833XA 1956-11-28 1956-11-28

Publications (1)

Publication Number Publication Date
GB849530A true GB849530A (en) 1960-09-28

Family

ID=21885349

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35707/57A Expired GB849530A (en) 1956-11-28 1957-11-15 Telephone apparatus employing transistor amplifiers

Country Status (5)

Country Link
BE (1) BE562469A (cs)
CH (1) CH358833A (cs)
DE (1) DE1089418B (cs)
FR (1) FR1188597A (cs)
GB (1) GB849530A (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL255342A (cs) * 1959-08-31
NL271742A (cs) * 1960-11-24
NL271744A (cs) * 1960-11-24
NL271741A (cs) * 1960-11-24

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE678028C (de) * 1931-10-05 1939-07-07 Stabilovolt G M B H Schaltung fuer Elektronenroehren zur Abnahme einer negativen Gittervorspannung
AT193438B (de) * 1955-11-03 1957-11-25 Kapsch Telephon Telegraph Fernsprechstation mit Verstärker

Also Published As

Publication number Publication date
BE562469A (cs)
DE1089418B (de) 1960-09-22
CH358833A (de) 1961-12-15
FR1188597A (fr) 1959-09-23

Similar Documents

Publication Publication Date Title
US2693568A (en) Current and voltage regulation
US2850650A (en) Transistor current limiter
GB859111A (en) Improvements in or relating to telephone subscriber sets using amplifiers
US2818470A (en) Compensated transistor circuit
GB849530A (en) Telephone apparatus employing transistor amplifiers
GB858678A (en) Loudspeaking telephone using transistors
GB778072A (en) Improvements in electrical table lamps
GB871623A (en) Improvements in or relating to magnetostatic relays
US2967911A (en) Telephone bell ringing circuits
ES426575A1 (es) Perfeccionamientos introducidos en un circuito de adapta- cion de linea para uso en un aparato telefonico de abonado con marcacion de numero por pulsadores de tono.
GB694705A (en) Improvements in or relating to telephone set circuits
GB986310A (en) Telephone tone ringer
GB777627A (en) Improvements in transistor amplifiers
ES244069U (es) Circuito detector de corriente.
US3270142A (en) Variable impedance electrical circuits
GB791372A (en) Improvements in or relating to magnetostatic relays
GB849316A (en) Improvements in or relating to transistor amplifier circuits
GB1095635A (en) Improvements relating to tone callers
FR2403690A1 (fr) Dipole gyrateur
GB813944A (en) Improvements in or relating to transistor amplifiers
GB806562A (en) Improvements in or relating to telephone systems having substation circuits including transistors
GB747803A (en) Improvements in or relating to electric oscillation generators embodying a semi-conductor device
GB773850A (en) Improvements in or relating to telephone set circuits
GB558632A (en) Improvements in or relating to thermionic valve circuits
JPS54105405A (en) Amplifier for handset