DE1815174B2 - - Google Patents

Info

Publication number
DE1815174B2
DE1815174B2 DE19681815174 DE1815174A DE1815174B2 DE 1815174 B2 DE1815174 B2 DE 1815174B2 DE 19681815174 DE19681815174 DE 19681815174 DE 1815174 A DE1815174 A DE 1815174A DE 1815174 B2 DE1815174 B2 DE 1815174B2
Authority
DE
Germany
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.)
Granted
Application number
DE19681815174
Other languages
German (de)
Other versions
DE1815174A1 (en
DE1815174C (en
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 filed Critical
Priority claimed from DE19681815174 external-priority patent/DE1815174C/en
Priority to DE19681815174 priority Critical patent/DE1815174C/en
Priority to DE19681815173 priority patent/DE1815173B1/en
Priority to JP9856269A priority patent/JPS5113962B1/ja
Priority to NL6918399A priority patent/NL145738B/en
Priority to CH1851669A priority patent/CH512862A/en
Priority to BG1354969A priority patent/BG20634A3/xx
Priority to LU60014D priority patent/LU60014A1/xx
Priority to AT1164169A priority patent/AT296403B/en
Priority to GB6115969A priority patent/GB1244548A/en
Priority to SE1736569A priority patent/SE346190B/xx
Priority to FR6943549A priority patent/FR2026348A1/fr
Priority to BE743283D priority patent/BE743283A/xx
Publication of DE1815174A1 publication Critical patent/DE1815174A1/en
Publication of DE1815174B2 publication Critical patent/DE1815174B2/de
Publication of DE1815174C publication Critical patent/DE1815174C/en
Application granted granted Critical
Expired legal-status Critical Current

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)
DE19681815174 1968-12-17 1968-12-17 Telephone microphone amplifier with power supply on the output side Expired DE1815174C (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
DE19681815174 DE1815174C (en) 1968-12-17 Telephone microphone amplifier with power supply on the output side
DE19681815173 DE1815173B1 (en) 1968-12-17 1968-12-17 Circuit arrangement for telephone microphone amplifier
JP9856269A JPS5113962B1 (en) 1968-12-17 1969-12-08
NL6918399A NL145738B (en) 1968-12-17 1969-12-08 CIRCUIT FOR A MICROPHONE AMPLIFIER.
CH1851669A CH512862A (en) 1968-12-17 1969-12-11 Circuit arrangement for telephone microphone amplifiers
LU60014D LU60014A1 (en) 1968-12-17 1969-12-15
BG1354969A BG20634A3 (en) 1968-12-17 1969-12-15
AT1164169A AT296403B (en) 1968-12-17 1969-12-15 Circuit arrangement for transistorized telephone microphone amplifiers
GB6115969A GB1244548A (en) 1968-12-17 1969-12-16 Improvements in or relating to microphone amplifiers
SE1736569A SE346190B (en) 1968-12-17 1969-12-16
FR6943549A FR2026348A1 (en) 1968-12-17 1969-12-16
BE743283D BE743283A (en) 1968-12-17 1969-12-17

Applications Claiming Priority (2)

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

Publications (3)

Publication Number Publication Date
DE1815174A1 DE1815174A1 (en) 1970-06-18
DE1815174B2 true DE1815174B2 (en) 1970-10-29
DE1815174C DE1815174C (en) 1973-08-23

Family

ID=

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2115670A1 (en) * 1971-03-31 1972-06-29

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2115670A1 (en) * 1971-03-31 1972-06-29

Also Published As

Publication number Publication date
SE346190B (en) 1972-06-26
DE1815174A1 (en) 1970-06-18
BE743283A (en) 1970-06-17
BG20634A3 (en) 1975-12-05
LU60014A1 (en) 1970-02-16
GB1244548A (en) 1971-09-02
CH512862A (en) 1971-09-15
FR2026348A1 (en) 1970-09-18
NL6918399A (en) 1970-06-19
NL145738B (en) 1975-04-15
DE1815173B1 (en) 1970-08-20
AT296403B (en) 1972-02-10
JPS5113962B1 (en) 1976-05-06

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Legal Events

Date Code Title Description
E77 Valid patent as to the heymanns-index 1977
EHJ Ceased/non-payment of the annual fee