JPS54104761A - Audio amplifier - Google Patents
Audio amplifierInfo
- Publication number
- JPS54104761A JPS54104761A JP1173078A JP1173078A JPS54104761A JP S54104761 A JPS54104761 A JP S54104761A JP 1173078 A JP1173078 A JP 1173078A JP 1173078 A JP1173078 A JP 1173078A JP S54104761 A JPS54104761 A JP S54104761A
- Authority
- JP
- Japan
- Prior art keywords
- capacitance
- terminal
- resistor
- breeder
- potential
- 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
Links
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE: To prevent the destruction of output transistor, when the output terminal is shortened with the power supply terminal or ground, by comparing the central point of the breeder circuit with the potential of the feedback capacitance.
CONSTITUTION: Audio signal is inputted from the non inversion input terminal 1 via the resistor 7 from the contact point of the resistors 5 and 6, and amplification 12 is made with the rate determined with the resistors 8 and 9 and the capacitance 11. The central point of the breeder consisting of the resistor 5 and 6 and the output of the comparators 13 and 15 taking the junction of the feedback capacitance 11 and the resistor 8 are connected to the switching circuits 14 and 16, and the base bias of the final stage transistor is turned off when the output terminal 2 is shortened or grounded. Power supply is connected to the terminal 3 and the terminal 4 is grounded. With this constitution, since the DC potential of the capacitance 11 is greatly shifted from a half of the power supply voltage, the breeder neutral point is taken as the reference voltage by utilizing it, and the potential of the capacitance 11 is compared 13 and 15 and switched 14 and 16, turning off the final stage transistor of the amplitude 12. The capacitance 11 is rapidly charged up 17 and the circuit is started.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1173078A JPS54104761A (en) | 1978-02-03 | 1978-02-03 | Audio amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1173078A JPS54104761A (en) | 1978-02-03 | 1978-02-03 | Audio amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54104761A true JPS54104761A (en) | 1979-08-17 |
| JPS6352482B2 JPS6352482B2 (en) | 1988-10-19 |
Family
ID=11786140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1173078A Granted JPS54104761A (en) | 1978-02-03 | 1978-02-03 | Audio amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54104761A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5696724U (en) * | 1979-12-26 | 1981-07-31 | ||
| JPS5893013U (en) * | 1981-12-17 | 1983-06-23 | 日本コロムビア株式会社 | Output transistor current limit circuit |
| JP2012090125A (en) * | 2010-10-21 | 2012-05-10 | Onkyo Corp | Amplifying device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7205834B2 (en) * | 2002-07-18 | 2007-04-17 | Sony Corporation | Power amplifier |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS498153A (en) * | 1972-05-10 | 1974-01-24 | ||
| JPS5171050A (en) * | 1974-12-17 | 1976-06-19 | Nippon Musical Instruments Mfg |
-
1978
- 1978-02-03 JP JP1173078A patent/JPS54104761A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS498153A (en) * | 1972-05-10 | 1974-01-24 | ||
| JPS5171050A (en) * | 1974-12-17 | 1976-06-19 | Nippon Musical Instruments Mfg |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5696724U (en) * | 1979-12-26 | 1981-07-31 | ||
| JPS5893013U (en) * | 1981-12-17 | 1983-06-23 | 日本コロムビア株式会社 | Output transistor current limit circuit |
| JP2012090125A (en) * | 2010-10-21 | 2012-05-10 | Onkyo Corp | Amplifying device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6352482B2 (en) | 1988-10-19 |
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