JPS5575315A - Output amplifier circuit - Google Patents

Output amplifier circuit

Info

Publication number
JPS5575315A
JPS5575315A JP14929278A JP14929278A JPS5575315A JP S5575315 A JPS5575315 A JP S5575315A JP 14929278 A JP14929278 A JP 14929278A JP 14929278 A JP14929278 A JP 14929278A JP S5575315 A JPS5575315 A JP S5575315A
Authority
JP
Japan
Prior art keywords
transistor
secured
relay
rexr2
r1xrl
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
JP14929278A
Other languages
Japanese (ja)
Inventor
Ikuo Kanayama
Yosuke Yasui
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP14929278A priority Critical patent/JPS5575315A/en
Publication of JPS5575315A publication Critical patent/JPS5575315A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Abstract

PURPOSE:To ensure the good action in accordance with the load fluctuation by detecting the load impedance and then varying the power voltage. CONSTITUTION:Resistances 26 and 27 are referred to as RE along with resistances 29 and 31 to as R1 and R2 respectively, and as a result the bridge circuit is formed to impedance RL of speaker 6. As R1XRL=REXR2 is satisfied, the equal potential is secured between the base and the emitter of transistor 32. Thus transistor 32 is turned off with relay 34 set immobile. Relay 34 possesses contacts 3 and 4 for switching of the power voltage. While the proper value is secured for RL=8OMEGA along with connection of the speaker of RL=4OMEGA, and thus R1XRL<REXR2 is secured to break the bridge. As a result, transistor 32 is turned on to actuate relay 34, thus obtaining the proper level of voltage for driving of the load impedance.
JP14929278A 1978-12-01 1978-12-01 Output amplifier circuit Pending JPS5575315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14929278A JPS5575315A (en) 1978-12-01 1978-12-01 Output amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14929278A JPS5575315A (en) 1978-12-01 1978-12-01 Output amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5575315A true JPS5575315A (en) 1980-06-06

Family

ID=15471982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14929278A Pending JPS5575315A (en) 1978-12-01 1978-12-01 Output amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5575315A (en)

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