JPS54101603A - Muting unit of tuning meter - Google Patents
Muting unit of tuning meterInfo
- Publication number
- JPS54101603A JPS54101603A JP809878A JP809878A JPS54101603A JP S54101603 A JPS54101603 A JP S54101603A JP 809878 A JP809878 A JP 809878A JP 809878 A JP809878 A JP 809878A JP S54101603 A JPS54101603 A JP S54101603A
- Authority
- JP
- Japan
- Prior art keywords
- trq
- meter
- power source
- state
- turned
- 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 prevent the center value of a meter from shifting, by providing a muting circuit in the tuning meter of a FM receiver.
CONSTITUTION: Immediately after the power source is turned on and in a low- voltage state where the voltage has not yet reached power source voltage Vcc, TrQ5 of power source voltage detection-type muting circuit VM is cut off, and TrQ3 is in an ON-state. Therefore, TrQ1 and Q2 are in an ON-state, and the output end of tuning meter driving circuit 11, namely, tuning meter M is short-circuited to mute the meter operation. When power source voltage Vcc becomes higher and TrQ5 is turned on, TrQ3 is turned off to make a stationary state because the potential at a P point is lowered. Meanwhile, the operation of input level detection-type muting circuit IM is performed similarly, and the conduction of TrQ1 and Q2 is controlled by TrQ4 and Q6, thereby muting.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP809878A JPS54101603A (en) | 1978-01-27 | 1978-01-27 | Muting unit of tuning meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP809878A JPS54101603A (en) | 1978-01-27 | 1978-01-27 | Muting unit of tuning meter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54101603A true JPS54101603A (en) | 1979-08-10 |
Family
ID=11683825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP809878A Pending JPS54101603A (en) | 1978-01-27 | 1978-01-27 | Muting unit of tuning meter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54101603A (en) |
-
1978
- 1978-01-27 JP JP809878A patent/JPS54101603A/en active Pending
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