JPS57174907A - Muting circuit - Google Patents
Muting circuitInfo
- Publication number
- JPS57174907A JPS57174907A JP56059453A JP5945381A JPS57174907A JP S57174907 A JPS57174907 A JP S57174907A JP 56059453 A JP56059453 A JP 56059453A JP 5945381 A JP5945381 A JP 5945381A JP S57174907 A JPS57174907 A JP S57174907A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- current flows
- zener diode
- base
- resistor
- 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.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE: To achieve muting operation, by detecting the change from OFF to ON state (closing) of a power switch and that from ON to OFF (opening) by itself.
CONSTITUTION: When a switch S1 is applied, a current flows to a Zener diode D1 through the switch S1 and a resistor R2 from a power supply +B, and a capacitor C1 is charged with a voltage regulated at the Zener diode. The charging current flows to the base of a transistor Tr1 via a diode D6 and a resistor R3 to turn on the Tr1. Thus, pulse-like noise generated on a line 2 through the application of switch is absorbed to ground via the Tr1. When the switch S1 is opened conversely, since the base of a Tr2 is grounded via resistors R4 and R1, the Tr2 turns on. As a result, a current flows to a Zener diode D3 through the Tr2 and an R6 from the power supply +B and a capacitor C2 is charged with a voltage regulated at the Zener diode D3. Pulse-like noise can be rejected, because the charging current flows to the base of the Tr1 through a D5 and the R3 and the Tr1 turns on.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56059453A JPS57174907A (en) | 1981-04-20 | 1981-04-20 | Muting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56059453A JPS57174907A (en) | 1981-04-20 | 1981-04-20 | Muting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57174907A true JPS57174907A (en) | 1982-10-27 |
Family
ID=13113728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56059453A Pending JPS57174907A (en) | 1981-04-20 | 1981-04-20 | Muting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57174907A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5442617A (en) * | 1992-09-16 | 1995-08-15 | Samsung Electronics Co., Ltd. | Digital noise blanking circuit of CD-ROM system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52102716A (en) * | 1976-02-25 | 1977-08-29 | Fuji Photo Film Co Ltd | Photographic film unit |
-
1981
- 1981-04-20 JP JP56059453A patent/JPS57174907A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52102716A (en) * | 1976-02-25 | 1977-08-29 | Fuji Photo Film Co Ltd | Photographic film unit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5442617A (en) * | 1992-09-16 | 1995-08-15 | Samsung Electronics Co., Ltd. | Digital noise blanking circuit of CD-ROM system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS55115729A (en) | Mos transistor circuit | |
JPS57124946A (en) | Pulse detection circuit | |
JPS57204629A (en) | Control circuit of pulse width | |
JPS57109189A (en) | Output buffer circuit | |
JPS57174907A (en) | Muting circuit | |
JPS57104325A (en) | Ecl circuit | |
JPS5654124A (en) | Contact read-in circuit | |
JPS56123111A (en) | Muting circuit | |
JPS54149564A (en) | Delay circuit | |
JPS56159716A (en) | Direct-current electric power device | |
JPS5769942A (en) | Detection circuit for selecting gallout signal | |
JPS5518731A (en) | Generating circuit for initial reset signal | |
JPS5724123A (en) | Reset circuit | |
JPS55132521A (en) | Recording circuit for flexible disc unit | |
JPS551660A (en) | Signal detection circuit | |
JPS5748829A (en) | Semiconductor switch circuit | |
JPS54124248A (en) | Constant-voltage circuit with reset signal generating circuit | |
JPS55149873A (en) | Overcurrent detector | |
JPS5478423A (en) | Voltage detection circuit | |
JPS5647815A (en) | Stabilized electric power supply unit | |
JPS56151365A (en) | Noise detector | |
JPS5735421A (en) | Malfunction preventing circuit at power supply application | |
JPS645795B2 (en) | ||
JPS5450948A (en) | Bidirectional constant current circuit | |
JPS648894A (en) | Power source circuit for servo amplifier |