JPS54119812A - Amplifier for transmitter - Google Patents

Amplifier for transmitter

Info

Publication number
JPS54119812A
JPS54119812A JP1095778A JP1095778A JPS54119812A JP S54119812 A JPS54119812 A JP S54119812A JP 1095778 A JP1095778 A JP 1095778A JP 1095778 A JP1095778 A JP 1095778A JP S54119812 A JPS54119812 A JP S54119812A
Authority
JP
Japan
Prior art keywords
diode
constant
collector
output
level
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.)
Granted
Application number
JP1095778A
Other languages
Japanese (ja)
Other versions
JPS567338B2 (en
Inventor
Esao Hishinuma
Hiroshi Hara
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1095778A priority Critical patent/JPS54119812A/en
Priority to US06/001,361 priority patent/US4233474A/en
Publication of JPS54119812A publication Critical patent/JPS54119812A/en
Publication of JPS567338B2 publication Critical patent/JPS567338B2/ja
Granted 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
    • H04M1/02—Constructional features of telephone sets
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/06—Hooks; Cradles
    • H04M1/10—Hooks; Cradles associated with switches operated by magnetic effect due to proximity of receiver or hand-set

Abstract

PURPOSE:To enable to keep the arriving level of exchanger terminal widely constant, by lowering the collector-to-base voltage drop of the first and third transistor than that corresponding to one diode drop and keeping constant the output level of the amplifier of the transmitter. CONSTITUTION:The diode 2 and the transistor TrT1, and diode D2 and TrT3 constitute two constant current circuits. Each collector output is respectively connected to the diodes 4 and 5 and the output of the diodes 4 and 5 is connected to the collector of TrT2 and T4 of the two constant current consisting of diode D3, Tr2 and diode D3 and TrT4. By lowering the collector-to-base voltage drop of TrT1 and T3 than one diode voltage, even with small current supply, the output level of the amplifier for transmitter can be controlled constant. Thus, the level of arrival of exchanger terminal when connecting to the telephone line can be kept constant widely independently of the length of the telephone line.
JP1095778A 1978-01-10 1978-02-01 Amplifier for transmitter Granted JPS54119812A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1095778A JPS54119812A (en) 1978-02-01 1978-02-01 Amplifier for transmitter
US06/001,361 US4233474A (en) 1978-01-10 1979-01-05 Telephone transmitter amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1095778A JPS54119812A (en) 1978-02-01 1978-02-01 Amplifier for transmitter

Publications (2)

Publication Number Publication Date
JPS54119812A true JPS54119812A (en) 1979-09-18
JPS567338B2 JPS567338B2 (en) 1981-02-17

Family

ID=11764656

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1095778A Granted JPS54119812A (en) 1978-01-10 1978-02-01 Amplifier for transmitter

Country Status (1)

Country Link
JP (1) JPS54119812A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56136072A (en) * 1980-03-26 1981-10-23 Nec Corp Telephone set service network

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981000A (en) * 1982-10-30 1984-05-10 名商株式会社 Device for cutting and forming lead wire
JPS60231538A (en) * 1984-05-01 1985-11-18 Hitachi Ltd Reed straightener

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56136072A (en) * 1980-03-26 1981-10-23 Nec Corp Telephone set service network
JPS6041909B2 (en) * 1980-03-26 1985-09-19 日本電気株式会社 Telephone communication network

Also Published As

Publication number Publication date
JPS567338B2 (en) 1981-02-17

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