JPS5597768A - Transmitting amplifier circuit - Google Patents

Transmitting amplifier circuit

Info

Publication number
JPS5597768A
JPS5597768A JP497279A JP497279A JPS5597768A JP S5597768 A JPS5597768 A JP S5597768A JP 497279 A JP497279 A JP 497279A JP 497279 A JP497279 A JP 497279A JP S5597768 A JPS5597768 A JP S5597768A
Authority
JP
Japan
Prior art keywords
transmitter
amplifying
connection
current
telephone
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.)
Pending
Application number
JP497279A
Other languages
Japanese (ja)
Inventor
Hitoshi Ito
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP497279A priority Critical patent/JPS5597768A/en
Publication of JPS5597768A publication Critical patent/JPS5597768A/en
Pending 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
    • H04M1/60—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)
  • Signal Processing (AREA)

Abstract

PURPOSE:To make the multiple parallel calling of a common-battery telephone set by making a series DC connection between a transmitter and current amplifier circuit and an AC connection between perior and post stages. CONSTITUTION:A series DC connection between transmitter M and emitter-follower-connected current amplifying transistor Tr is made and an AC prior/post-stage connection between transmitter M and amplifying Tr is also made via coupling transformer T. Further, hybrid circuit Hg for side-tone attenuation to receiver R is connected to telephone-line connection terminal L1, the emitter of amplifying Tr is connected to telephone-line connection terminal L2, and its collector is DC-connected to terminal L1 by way of transformer T and transmitter M. Then, a DC current flowing through amplifier Tr is nearly equalized in value to that through transmitter M, and currents flowing through transmitter M and amplifying Tr are held constant at any time; and a current when several common-battery telephone sets are connected in parallel between terminals L1 and L2 is made constant and common-battery telephone sets are connected in parallel and used.
JP497279A 1979-01-19 1979-01-19 Transmitting amplifier circuit Pending JPS5597768A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP497279A JPS5597768A (en) 1979-01-19 1979-01-19 Transmitting amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP497279A JPS5597768A (en) 1979-01-19 1979-01-19 Transmitting amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5597768A true JPS5597768A (en) 1980-07-25

Family

ID=11598502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP497279A Pending JPS5597768A (en) 1979-01-19 1979-01-19 Transmitting amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5597768A (en)

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