JPS54101603A - Muting unit of tuning meter - Google Patents

Muting unit of tuning meter

Info

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
Application number
JP809878A
Other languages
Japanese (ja)
Inventor
Hiromi Kusakabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP809878A priority Critical patent/JPS54101603A/en
Publication of JPS54101603A publication Critical patent/JPS54101603A/en
Pending legal-status Critical Current

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
JP809878A 1978-01-27 1978-01-27 Muting unit of tuning meter Pending JPS54101603A (en)

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)

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