JPS5720018A - Channel selection device - Google Patents

Channel selection device

Info

Publication number
JPS5720018A
JPS5720018A JP9532180A JP9532180A JPS5720018A JP S5720018 A JPS5720018 A JP S5720018A JP 9532180 A JP9532180 A JP 9532180A JP 9532180 A JP9532180 A JP 9532180A JP S5720018 A JPS5720018 A JP S5720018A
Authority
JP
Japan
Prior art keywords
voltage
band
turns
switching
vhl
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
JP9532180A
Other languages
Japanese (ja)
Inventor
Isao Fujimoto
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 JP9532180A priority Critical patent/JPS5720018A/en
Publication of JPS5720018A publication Critical patent/JPS5720018A/en
Pending 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

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To regulate the lower limit of a receivable frequency range adequately, only by modifying a conventional device slightly by generating a regulation voltage only when a band which should be regulated is selected. CONSTITUTION:A switching part 7 is composed of switching transistors TR71 and 72, and base ends are connected to switching terminals Bl and Bu for the VHF low band and UHF high band which need not be regulated. Consequently, the TR71 or 72 turns on in the reception of the VHR low band or UHF high band. Therefore, the TR turns on only during the reception of the VHF high band to extract a lower- limit regulation voltage Vhl. Further, this voltage Vhl is applied to the tuning- voltage application terminal 24 of a tuner 2 via a switching diode 8. Therefore, when the output voltage of a channel selection part 4 drops below the voltage Vhl, a diode 8 turns on and holds the tuning voltage at the voltage Vhl, thereby regulating the range of a lower-limit receivable frequency.
JP9532180A 1980-07-10 1980-07-10 Channel selection device Pending JPS5720018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9532180A JPS5720018A (en) 1980-07-10 1980-07-10 Channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9532180A JPS5720018A (en) 1980-07-10 1980-07-10 Channel selection device

Publications (1)

Publication Number Publication Date
JPS5720018A true JPS5720018A (en) 1982-02-02

Family

ID=14134471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9532180A Pending JPS5720018A (en) 1980-07-10 1980-07-10 Channel selection device

Country Status (1)

Country Link
JP (1) JPS5720018A (en)

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