JPS5523682A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPS5523682A
JPS5523682A JP9707578A JP9707578A JPS5523682A JP S5523682 A JPS5523682 A JP S5523682A JP 9707578 A JP9707578 A JP 9707578A JP 9707578 A JP9707578 A JP 9707578A JP S5523682 A JPS5523682 A JP S5523682A
Authority
JP
Japan
Prior art keywords
voltage
power supply
output
circuit
power
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
JP9707578A
Other languages
Japanese (ja)
Other versions
JPS6153889B2 (en
Inventor
Masashi Shoji
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 JP9707578A priority Critical patent/JPS5523682A/en
Publication of JPS5523682A publication Critical patent/JPS5523682A/en
Publication of JPS6153889B2 publication Critical patent/JPS6153889B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To avoid the speaker from being outputted with pulsative excess current, by increasing the voltage at the output terminal gradually, through the gradual increase of the collector potential of drive transistor driving the push pull circuit at the application of power supply.
CONSTITUTION: The amplifier provides the SEPP power amplifying circuit consisting of complementary transistors Tr 21 and 22, and drive circuit consisting of Tr 18 driving the circuit and diode 20, and the voltage from the power supply 7 is fed to Tr 18 via Tr 12, 15 constituting the differential amplifier to drive the power amplifying circuit. Between the power supply 7 and Tr 18 with this constitution, the line voltage fulctuation rejection circuit consisting of Tr 23, resistor 24 and capacitor 1, is connected. At the voltage transient of power application, the switch means 27 is closed, and a voltage is fed to the collector of Tr 18 via through Tr 26, and at steady state, the means 27 is opened. The output of Tr 18 at the period when the transient variation is caused at the application of power supply, is taken as the output voltage of the power amplifying circuit the same, to avoid the output of excess current to the load 5.
COPYRIGHT: (C)1980,JPO&Japio
JP9707578A 1978-08-08 1978-08-08 Power amplifier Granted JPS5523682A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9707578A JPS5523682A (en) 1978-08-08 1978-08-08 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9707578A JPS5523682A (en) 1978-08-08 1978-08-08 Power amplifier

Publications (2)

Publication Number Publication Date
JPS5523682A true JPS5523682A (en) 1980-02-20
JPS6153889B2 JPS6153889B2 (en) 1986-11-19

Family

ID=14182512

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9707578A Granted JPS5523682A (en) 1978-08-08 1978-08-08 Power amplifier

Country Status (1)

Country Link
JP (1) JPS5523682A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376391U (en) * 1989-11-28 1991-07-31

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498153A (en) * 1972-05-10 1974-01-24

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498153A (en) * 1972-05-10 1974-01-24

Also Published As

Publication number Publication date
JPS6153889B2 (en) 1986-11-19

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