JPS5468601A - Muting circuit - Google Patents
Muting circuitInfo
- Publication number
- JPS5468601A JPS5468601A JP13585477A JP13585477A JPS5468601A JP S5468601 A JPS5468601 A JP S5468601A JP 13585477 A JP13585477 A JP 13585477A JP 13585477 A JP13585477 A JP 13585477A JP S5468601 A JPS5468601 A JP S5468601A
- Authority
- JP
- Japan
- Prior art keywords
- trs
- conducting
- terminal
- voltages
- muted
- 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
Abstract
PURPOSE: To perform good muting by connecting PNP and NPN type transistors between output terminal and ground and switching these with driving voltages of mutually opposite polarities.
CONSTITUTION: When the switch of the shell containing a cartridge 10 is closed, a negative voltage is applied to terminal 24 and a transistor Tr 21 conducts, and Tr 20 changes from conducting to non-conducting state, hence supply voltages of -B, +B respectively are applied to the bases of the Trs 13, 14, and the Trs 13, 14 become both conducting. Hence, the output terminal is grounded and the output signal from a coil 11 is muted. At the time when the Trs 13, 14 change from the non-conducting to conducting state, negative and positive voltages are generated respectively in the terminal 12, but the values of resistances 15, 17 are made mutually equal and therefore, the voltages negate with each other and no transient noise is generated in the terminal 12. Further, the Trs 13, 14 are parallel connected and therefore the impedance of the circuit decreases and even the minute signal is well muted.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13585477A JPS5468601A (en) | 1977-11-11 | 1977-11-11 | Muting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13585477A JPS5468601A (en) | 1977-11-11 | 1977-11-11 | Muting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5468601A true JPS5468601A (en) | 1979-06-01 |
Family
ID=15161315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13585477A Pending JPS5468601A (en) | 1977-11-11 | 1977-11-11 | Muting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5468601A (en) |
-
1977
- 1977-11-11 JP JP13585477A patent/JPS5468601A/en active Pending
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