JPS56110330A - Channel selection circuit - Google Patents

Channel selection circuit

Info

Publication number
JPS56110330A
JPS56110330A JP1265080A JP1265080A JPS56110330A JP S56110330 A JPS56110330 A JP S56110330A JP 1265080 A JP1265080 A JP 1265080A JP 1265080 A JP1265080 A JP 1265080A JP S56110330 A JPS56110330 A JP S56110330A
Authority
JP
Japan
Prior art keywords
voltage
channel selection
base
selection circuit
vrn
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
JP1265080A
Other languages
Japanese (ja)
Other versions
JPS6161576B2 (en
Inventor
Isao Fujimoto
Koji Terami
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.)
Sanyo Electric Co Ltd
Original Assignee
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP1265080A priority Critical patent/JPS56110330A/en
Priority to CA000359597A priority patent/CA1180139A/en
Priority to DE19803034530 priority patent/DE3034530A1/en
Priority to GB8029512A priority patent/GB2060294B/en
Publication of JPS56110330A publication Critical patent/JPS56110330A/en
Publication of JPS6161576B2 publication Critical patent/JPS6161576B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes

Abstract

PURPOSE:To facilitate a complicated control for a receivable range in a channel selection circuit, by fixing the lower limit of the tuning voltage that is applied to a tuner. CONSTITUTION:The voltage decided by the variable resistor VRn of the channel set according to the channel selection signal is applied to the base of the transistor TR. Thus the capacitor C is charged, and the voltage of the output terminal 5 increases up to a prescribed level. In case the voltage lower than the lowest voltage of 1.25V is applied to the base of the TR, no forward bias is applied between the base and the emitter of the TR. As a result, the TR is turned off and the voltage lower than 1.25V and given by the resistor VRn never emerges at the terminal 5.
JP1265080A 1979-09-14 1980-02-04 Channel selection circuit Granted JPS56110330A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1265080A JPS56110330A (en) 1980-02-04 1980-02-04 Channel selection circuit
CA000359597A CA1180139A (en) 1979-09-14 1980-09-05 Tuner apparatus
DE19803034530 DE3034530A1 (en) 1979-09-14 1980-09-12 TUNING DEVICE
GB8029512A GB2060294B (en) 1979-09-14 1980-09-12 Voltage variable capacitance tuner apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1265080A JPS56110330A (en) 1980-02-04 1980-02-04 Channel selection circuit

Publications (2)

Publication Number Publication Date
JPS56110330A true JPS56110330A (en) 1981-09-01
JPS6161576B2 JPS6161576B2 (en) 1986-12-26

Family

ID=11811234

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1265080A Granted JPS56110330A (en) 1979-09-14 1980-02-04 Channel selection circuit

Country Status (1)

Country Link
JP (1) JPS56110330A (en)

Also Published As

Publication number Publication date
JPS6161576B2 (en) 1986-12-26

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