JPS57129008A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPS57129008A
JPS57129008A JP56014307A JP1430781A JPS57129008A JP S57129008 A JPS57129008 A JP S57129008A JP 56014307 A JP56014307 A JP 56014307A JP 1430781 A JP1430781 A JP 1430781A JP S57129008 A JPS57129008 A JP S57129008A
Authority
JP
Japan
Prior art keywords
capacitor
circuit
electric power
power amplifier
power supply
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
JP56014307A
Other languages
Japanese (ja)
Other versions
JPH0119286B2 (en
Inventor
Kunio Seki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56014307A priority Critical patent/JPS57129008A/en
Publication of JPS57129008A publication Critical patent/JPS57129008A/en
Publication of JPH0119286B2 publication Critical patent/JPH0119286B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To simplify a circuit and to reduce a cost as an electric power amplifier, by using both a capacitor for automatic release in a safety operation area protecting circuit, and a capacitor for removing an electric power supply ripple.
CONSTITUTION: Both output transistors (TR) Q19, Q21 are cascaded and the B- class push-pull operation is executed. On the base of a TR Q23, a constant- current TR Q9 for supplying a bias current is provided. A capacitor C101 for removing an electric power supply ripple component of a bias current circuit is connected to the connecting point of resistances R9, R10 through the 8-th terminal. Accordingly, in case when the TR Q19 has been deviated from the prescribbed operation area, the TR Q19 is cut off forcibly by the bias controlling circuit, and the operation of the TR Q19 is released by a time constant which has utilized the capacitor C101.
COPYRIGHT: (C)1982,JPO&Japio
JP56014307A 1981-02-04 1981-02-04 Power amplifier Granted JPS57129008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56014307A JPS57129008A (en) 1981-02-04 1981-02-04 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56014307A JPS57129008A (en) 1981-02-04 1981-02-04 Power amplifier

Publications (2)

Publication Number Publication Date
JPS57129008A true JPS57129008A (en) 1982-08-10
JPH0119286B2 JPH0119286B2 (en) 1989-04-11

Family

ID=11857438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56014307A Granted JPS57129008A (en) 1981-02-04 1981-02-04 Power amplifier

Country Status (1)

Country Link
JP (1) JPS57129008A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4835251U (en) * 1971-09-01 1973-04-27
JPS4855748U (en) * 1971-10-27 1973-07-17

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4835251U (en) * 1971-09-01 1973-04-27
JPS4855748U (en) * 1971-10-27 1973-07-17

Also Published As

Publication number Publication date
JPH0119286B2 (en) 1989-04-11

Similar Documents

Publication Publication Date Title
JPS57170606A (en) Amplifying circuit for pulse-width-modulated signal
JPS57173220A (en) Comparator circuit
JPS5529234A (en) Power supply device
JPS57129008A (en) Power amplifier
EP0794608A3 (en) Trickle power supply
JPS52116054A (en) Amplifier circuit
JPS53147255A (en) Current output circuit
JPS5416953A (en) Input current monitor system
JPS5553182A (en) Starting circuit for switching-mode power-supply circuit
JPS5395251A (en) Dc stabilized power supply
EP0822645A3 (en) Trickle power supply
JPS56122513A (en) Electric power supply system
JPS5416145A (en) Digital output circuit
JPS5791057A (en) Connecting device for communication line
JPS5412408A (en) Constant voltage power source system
JPS5544683A (en) Additional communication equipment
JPS53117709A (en) Dummy resistor on-off circuit
JPS5484225A (en) Switching power source circuit
JPS52116823A (en) Protection system for switching type dc stabilized power supply
JPS57184309A (en) Protecting circuit of amplifier
JPS5341745A (en) Overcurrent protector for intermittent load
JPS5329602A (en) Power supply connection circuit
JPS5347951A (en) Operation duty test circuits for light arrestors
JPS521444A (en) Constant current power supply system
JPS5394841A (en) Switching system for circuit corresponding part of communication control un it