JPS56131226A - Afc circuit - Google Patents

Afc circuit

Info

Publication number
JPS56131226A
JPS56131226A JP3553880A JP3553880A JPS56131226A JP S56131226 A JPS56131226 A JP S56131226A JP 3553880 A JP3553880 A JP 3553880A JP 3553880 A JP3553880 A JP 3553880A JP S56131226 A JPS56131226 A JP S56131226A
Authority
JP
Japan
Prior art keywords
turns
tuning
afc
circuit
tuning state
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.)
Granted
Application number
JP3553880A
Other languages
Japanese (ja)
Other versions
JPS6129575B2 (en
Inventor
Masahisa Sudo
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP3553880A priority Critical patent/JPS56131226A/en
Publication of JPS56131226A publication Critical patent/JPS56131226A/en
Publication of JPS6129575B2 publication Critical patent/JPS6129575B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/023—Neutralization of the automatic frequency correction during a tuning change

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To improve the reliability of an AFC circuit and to constitute it at low cost by realizing AFC stop in a purely electronic way. CONSTITUTION:When a tuning state is beyond acquisition, the muting signal of IF amplifying circuit 5 is at H and while transistor Tr13 turns on, Tr14 turns off, thereby turning on Tr18. As a result, the output voltage of integrating network 9 is fixed at a reference voltage supplied from point X and AFC operation stops. Because it is out of tuning range at this time, the output of level detecting circuit 8 is at H and while Tr15 turn on, Tr16 turns off, so that tuning display LED turns on. Next, when the tuning state is placed in the acquisition range, the muting signal is at L, and while Tr13 turns off, Tr18 turns on, but since the charging current of capacitor 17 is supplied to the base of Tr18, which stays on. Therefore, while capacitor 17 is charged, the AFC operation stops. If the tuning state is set during the period, the output of circuit 8 is at L and LED21 displays the tuning state.
JP3553880A 1980-03-18 1980-03-18 Afc circuit Granted JPS56131226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3553880A JPS56131226A (en) 1980-03-18 1980-03-18 Afc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3553880A JPS56131226A (en) 1980-03-18 1980-03-18 Afc circuit

Publications (2)

Publication Number Publication Date
JPS56131226A true JPS56131226A (en) 1981-10-14
JPS6129575B2 JPS6129575B2 (en) 1986-07-08

Family

ID=12444503

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3553880A Granted JPS56131226A (en) 1980-03-18 1980-03-18 Afc circuit

Country Status (1)

Country Link
JP (1) JPS56131226A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0622720U (en) * 1992-03-12 1994-03-25 勝博 菅野 Incinerator using waste products
JP2002339081A (en) * 2001-05-18 2002-11-27 Kawasaki Steel Corp Polyester resin-coated tin alloy plated steel sheet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49104511A (en) * 1973-02-05 1974-10-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49104511A (en) * 1973-02-05 1974-10-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0622720U (en) * 1992-03-12 1994-03-25 勝博 菅野 Incinerator using waste products
JP2002339081A (en) * 2001-05-18 2002-11-27 Kawasaki Steel Corp Polyester resin-coated tin alloy plated steel sheet

Also Published As

Publication number Publication date
JPS6129575B2 (en) 1986-07-08

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