GB609541A - Improvements in or relating to low-frequency amplifying circuits - Google Patents
Improvements in or relating to low-frequency amplifying circuitsInfo
- Publication number
- GB609541A GB609541A GB8113/46A GB811346A GB609541A GB 609541 A GB609541 A GB 609541A GB 8113/46 A GB8113/46 A GB 8113/46A GB 811346 A GB811346 A GB 811346A GB 609541 A GB609541 A GB 609541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- low
- volume
- potentiometer
- impedance
- negative feed
- 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
- 230000003321 amplification Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
- H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes
- H03G3/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
609,541. Impedance networks. PHILIPS LAMPS, Ltd. March 15, 1946, No. 8113. Convention date, July 29, 1941. [Class 40 (viii)] [Also in Group XL (c)] In a low-frequency amplifier circuit the volume control which comprises a potentiometer in series with an impedance between grid and .cathode, and has associated with it negative feed-back which increases as the control moves towards the low-volume position, the volume is reduced to zero by connecting the end of the potentiometer not connected to the impedance across which the feed-back is applied, to the movable contact of a second potentiometer which has the voltages to be amplified applied across it and of which one end is connected to the cathode of the amplifier valve the two potentiometers being controlled in the same sense by a common operating member. In the Figure, negative feed-back is shown as applied from a source 10 and the arrangement is such that when the contacts are at B and D respectively the volume is reduced to zero. Frequency dependent networks 16, 17 and 11, 18 may be associated with potentiometer 13 and negative feed-back source 10 and are so proportioned that when the volume controls are displaced towards the low-volume position, amplification of the low frequencies decreases to a lesser extent than that of the higher frequencies.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL609541X | 1941-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB609541A true GB609541A (en) | 1948-10-04 |
Family
ID=19788055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8113/46A Expired GB609541A (en) | 1941-07-29 | 1946-03-15 | Improvements in or relating to low-frequency amplifying circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB609541A (en) |
-
1946
- 1946-03-15 GB GB8113/46A patent/GB609541A/en not_active Expired
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