GB840035A - Improvements in or relating to electrical circuits such as automatic volume control circuits - Google Patents
Improvements in or relating to electrical circuits such as automatic volume control circuitsInfo
- Publication number
- GB840035A GB840035A GB3468156A GB3468156A GB840035A GB 840035 A GB840035 A GB 840035A GB 3468156 A GB3468156 A GB 3468156A GB 3468156 A GB3468156 A GB 3468156A GB 840035 A GB840035 A GB 840035A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- diodes
- output
- transistor
- rectifier
- 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
- H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated
Landscapes
- Amplifiers (AREA)
Abstract
840,035. Automatic volume control. DRESSER INDUSTRIES Inc. Nov. 13, 1956, No. 34681/56. Class 40 (4). An automatic volume control circuit comprises two diodes or other unilaterally conductive devices coupled in parallel across a signal path and controlled in dependence upon the output signal of the path so as to vary their conductivity, a sensitive biasing circuit being provided for the cathode of one device and the anode of the other. In the Figure, two diodes 11, 14 are connected reversely in shunt with the input of an amplifier 4 in series with by-pass capacitors 35, 36. One diode is biased from the B+ supply through resistor 28 and resistor 30 and the other is biased through resistor 28, 34 and 31. The centre point of a potentiometer 20, 21 is connected through a resistor 24 to the opposite electrodes of the diodes, the arrangement being such that an equal bias is applied to each diode, rendering them non-conducting or just conducting. In the latter event resistors 20 and 21 may be omitted. An output from the amplifier is applied through transformer 48 to a full-wave rectifier 52, 53 and the output from this rectifier is applied to the base of a transistor 40 to vary the shunting effect of the transistor on the bias resistor 34. An increase in output on the amplifier causes the resistance of the transistor to decrease and accordingly the bias on the diodes to decrease so as to cause the input to the amplifier to remain more nearly constant. The time constant of the rise and decay of the control voltage may be varied by varying a resistor 44 and a capacitor 45 respectively. In an alternative embodiment (Fig. 2, not shown) the transistor is omitted and the output from the rectifier is applied directly across resistor 34. In this case the rectifier output may exceed the bias on the diodes so that they are rendered more conducting than is possible in the Fig. 1 arrangement. It is further stated that the output from the rectifier or the transistor in Fig. 1 could be connected in series with resistor 34 and also that the thermionic diodes could be replaced by semi-conductor diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3468156A GB840035A (en) | 1956-11-13 | 1956-11-13 | Improvements in or relating to electrical circuits such as automatic volume control circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3468156A GB840035A (en) | 1956-11-13 | 1956-11-13 | Improvements in or relating to electrical circuits such as automatic volume control circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB840035A true GB840035A (en) | 1960-07-06 |
Family
ID=10368652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3468156A Expired GB840035A (en) | 1956-11-13 | 1956-11-13 | Improvements in or relating to electrical circuits such as automatic volume control circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB840035A (en) |
-
1956
- 1956-11-13 GB GB3468156A patent/GB840035A/en not_active Expired
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