CH512862A - Circuit arrangement for telephone microphone amplifiers - Google Patents

Circuit arrangement for telephone microphone amplifiers

Info

Publication number
CH512862A
CH512862A CH1851669A CH1851669A CH512862A CH 512862 A CH512862 A CH 512862A CH 1851669 A CH1851669 A CH 1851669A CH 1851669 A CH1851669 A CH 1851669A CH 512862 A CH512862 A CH 512862A
Authority
CH
Switzerland
Prior art keywords
circuit arrangement
telephone microphone
microphone amplifiers
amplifiers
telephone
Prior art date
Application number
CH1851669A
Other languages
German (de)
Inventor
Katz Christian-Helmut
Franz Dipl Ing Beil
Original Assignee
Siemens Ag
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
Priority claimed from DE19681815174 external-priority patent/DE1815174C/en
Application filed by Siemens Ag filed Critical Siemens Ag
Publication of CH512862A publication Critical patent/CH512862A/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
    • 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
    • H03F3/347—DC amplifiers in which all stages are DC-coupled with semiconductor devices only in integrated circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
CH1851669A 1968-12-17 1969-12-11 Circuit arrangement for telephone microphone amplifiers CH512862A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19681815173 DE1815173B1 (en) 1968-12-17 1968-12-17 Circuit arrangement for telephone microphone amplifier
DE19681815174 DE1815174C (en) 1968-12-17 Telephone microphone amplifier with power supply on the output side

Publications (1)

Publication Number Publication Date
CH512862A true CH512862A (en) 1971-09-15

Family

ID=25756604

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1851669A CH512862A (en) 1968-12-17 1969-12-11 Circuit arrangement for telephone microphone amplifiers

Country Status (11)

Country Link
JP (1) JPS5113962B1 (en)
AT (1) AT296403B (en)
BE (1) BE743283A (en)
BG (1) BG20634A3 (en)
CH (1) CH512862A (en)
DE (1) DE1815173B1 (en)
FR (1) FR2026348A1 (en)
GB (1) GB1244548A (en)
LU (1) LU60014A1 (en)
NL (1) NL145738B (en)
SE (1) SE346190B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8004675A (en) * 1980-08-19 1982-03-16 Philips Nv SIGNAL BUFFER CIRCUIT IN AN INTEGRATED CIRCUIT FOR SUPPLYING AN OUTPUT SIGNAL TO A TERMINAL.

Also Published As

Publication number Publication date
LU60014A1 (en) 1970-02-16
BE743283A (en) 1970-06-17
NL145738B (en) 1975-04-15
DE1815174A1 (en) 1970-06-18
SE346190B (en) 1972-06-26
FR2026348A1 (en) 1970-09-18
GB1244548A (en) 1971-09-02
AT296403B (en) 1972-02-10
DE1815173B1 (en) 1970-08-20
BG20634A3 (en) 1975-12-05
JPS5113962B1 (en) 1976-05-06
DE1815174B2 (en) 1970-10-29
NL6918399A (en) 1970-06-19

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Legal Events

Date Code Title Description
PL Patent ceased