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GB1467649A - Electronic amplifier - Google Patents

Electronic amplifier

Info

Publication number
GB1467649A
GB1467649A GB2274074A GB2274074A GB1467649A GB 1467649 A GB1467649 A GB 1467649A GB 2274074 A GB2274074 A GB 2274074A GB 2274074 A GB2274074 A GB 2274074A GB 1467649 A GB1467649 A GB 1467649A
Authority
GB
United Kingdom
Prior art keywords
power amplifier
amplifier
resistor
input
potentiometer
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.)
Expired
Application number
GB2274074A
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.)
Novanex Automation NV
Original Assignee
Novanex Automation NV
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 Novanex Automation NV filed Critical Novanex Automation NV
Publication of GB1467649A publication Critical patent/GB1467649A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general

Landscapes

  • Amplifiers (AREA)

Abstract

1467649 Amplifiers; limiters; gain control NOVANEX AUTOMATION NV 21 May 1974 [22 May 1973] 22740/74 Heading H3T and H4R A power amplifier is provided with a limiter which is so connected to a potentiometer comprising two resistors and a Zener diode coupled between the output of the amplifier and a power supply terminal that the limiting level increases with mains voltage. Pre-amplifier 1 has input terminals 2 and is coupled by capacitor 3 to power amplifier 4 which drives loud-speaker 5. The input at the power amplifier is shunted by FET 10, the gate 13 of which is biased via resistor 14 and a series diode from the tapping point of a potentiometer comprising resistors 18, 19 and Zener diode 17, connected between the negative supply line and output of power amplifier 4. The gate 13 is also connected to the input of power amplifier 4 via resistor 15 and capacitor 16 to make its characteristic symmetrical. The cut-off characteristic is smoothed by means of a pair of reversely-poled diodes 7, 8 in series with adjustable resistor 9 across resistor 6. The Specification includes also, but does not describe, a complete circuit-diagram of the power amplifier (Fig. 2, not shown).
GB2274074A 1973-05-22 1974-05-21 Electronic amplifier Expired GB1467649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7307129A NL7307129A (en) 1973-05-22 1973-05-22

Publications (1)

Publication Number Publication Date
GB1467649A true GB1467649A (en) 1977-03-16

Family

ID=19818917

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2274074A Expired GB1467649A (en) 1973-05-22 1974-05-21 Electronic amplifier

Country Status (6)

Country Link
DE (1) DE2424604A1 (en)
FR (1) FR2231155B1 (en)
GB (1) GB1467649A (en)
IT (1) IT1012765B (en)
NL (1) NL7307129A (en)
SE (1) SE402684B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166015A (en) * 1984-10-05 1986-04-23 Ross Marks Limited Overload preventing circuit for headphones
GB2250151B (en) * 1990-07-30 1995-04-05 Nad Electronics Limited Power amplifier protection circuit
GB2408644A (en) * 2003-11-26 2005-06-01 Wolfson Ltd A monolithic CMOS audio amplifier with an output stage negative supply rail provided by a charge pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2516042C2 (en) * 1975-04-12 1987-01-02 Robert Bosch Gmbh, 7000 Stuttgart Circuit for adjustable limiting and control of the output voltage of a transistor amplifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166015A (en) * 1984-10-05 1986-04-23 Ross Marks Limited Overload preventing circuit for headphones
GB2250151B (en) * 1990-07-30 1995-04-05 Nad Electronics Limited Power amplifier protection circuit
GB2408644A (en) * 2003-11-26 2005-06-01 Wolfson Ltd A monolithic CMOS audio amplifier with an output stage negative supply rail provided by a charge pump
US7030699B2 (en) 2003-11-26 2006-04-18 Wolfson Microelectronics Plc Amplifier
GB2408644B (en) * 2003-11-26 2007-04-25 Wolfson Ltd Amplifier

Also Published As

Publication number Publication date
FR2231155A1 (en) 1974-12-20
FR2231155B1 (en) 1979-02-16
IT1012765B (en) 1977-03-10
NL7307129A (en) 1974-11-26
SE402684B (en) 1978-07-10
DE2424604A1 (en) 1974-12-12

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee