GB1467649A - Electronic amplifier - Google Patents
Electronic amplifierInfo
- 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
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).
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)
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)
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 |
-
1973
- 1973-05-22 NL NL7307129A patent/NL7307129A/xx not_active Application Discontinuation
-
1974
- 1974-05-21 GB GB2274074A patent/GB1467649A/en not_active Expired
- 1974-05-21 SE SE7406807A patent/SE402684B/en unknown
- 1974-05-21 DE DE19742424604 patent/DE2424604A1/en not_active Withdrawn
- 1974-05-22 FR FR7417859A patent/FR2231155B1/fr not_active Expired
- 1974-05-22 IT IT2311674A patent/IT1012765B/en active
Cited By (5)
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 |
---|---|
SE402684B (en) | 1978-07-10 |
IT1012765B (en) | 1977-03-10 |
FR2231155B1 (en) | 1979-02-16 |
FR2231155A1 (en) | 1974-12-20 |
NL7307129A (en) | 1974-11-26 |
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 |