JPS55159616A - Automatic fine tuning unit for tuner - Google Patents

Automatic fine tuning unit for tuner

Info

Publication number
JPS55159616A
JPS55159616A JP6674279A JP6674279A JPS55159616A JP S55159616 A JPS55159616 A JP S55159616A JP 6674279 A JP6674279 A JP 6674279A JP 6674279 A JP6674279 A JP 6674279A JP S55159616 A JPS55159616 A JP S55159616A
Authority
JP
Japan
Prior art keywords
output
circuit
aft
fet31
change
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
JP6674279A
Other languages
Japanese (ja)
Other versions
JPS6214126B2 (en
Inventor
Sadao Suzuki
Takaharu Shirato
Yoshitaka Fujiwara
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP6674279A priority Critical patent/JPS55159616A/en
Publication of JPS55159616A publication Critical patent/JPS55159616A/en
Publication of JPS6214126B2 publication Critical patent/JPS6214126B2/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

Abstract

PURPOSE:To enable normal AFT operation even for any of lower local and upper local with the constitution of an AFT circuit and this change-over circuit producing two outputs different in the polarity. CONSTITUTION:An output of inverse operations is respectively fed to output terminals 16 and 17 from output stage transistors (TR)14, 15 of an AFT circuit 6. When an FET31 of an AFT change-over circuit 7 is OFF, since the output from the terminal 16 is fed to an output TR30 via resistors 28 and 29, one output characteristics of a circuit 6 are obtained and the oscillating frequency of a local oscillator 4 is controlled. Next, when the input signal to a control terminal is changed over and the FET31 is ON, since the resistance value of FET31 is very small in comparison with a resistor 28, the output at the termianal 17 is mainly fed to the base of TR30, and another output characteristic of the circuit 6 is outputted from TR30, to change the oscillating frequency of the oscillator 4.
JP6674279A 1979-05-31 1979-05-31 Automatic fine tuning unit for tuner Granted JPS55159616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6674279A JPS55159616A (en) 1979-05-31 1979-05-31 Automatic fine tuning unit for tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6674279A JPS55159616A (en) 1979-05-31 1979-05-31 Automatic fine tuning unit for tuner

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP21654186A Division JPS6264115A (en) 1986-09-13 1986-09-13 Aft voltage selecting circuit

Publications (2)

Publication Number Publication Date
JPS55159616A true JPS55159616A (en) 1980-12-11
JPS6214126B2 JPS6214126B2 (en) 1987-03-31

Family

ID=13324626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6674279A Granted JPS55159616A (en) 1979-05-31 1979-05-31 Automatic fine tuning unit for tuner

Country Status (1)

Country Link
JP (1) JPS55159616A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866768U (en) * 1981-10-30 1983-05-06 日本電気ホームエレクトロニクス株式会社 AFT voltage selection circuit
JPS6264115A (en) * 1986-09-13 1987-03-23 Sony Corp Aft voltage selecting circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866768U (en) * 1981-10-30 1983-05-06 日本電気ホームエレクトロニクス株式会社 AFT voltage selection circuit
JPS6115660Y2 (en) * 1981-10-30 1986-05-15
JPS6264115A (en) * 1986-09-13 1987-03-23 Sony Corp Aft voltage selecting circuit
JPH0217966B2 (en) * 1986-09-13 1990-04-24 Sony Corp

Also Published As

Publication number Publication date
JPS6214126B2 (en) 1987-03-31

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