JPS5694818A - Limiting circuit for tuning range of electronic tuner - Google Patents

Limiting circuit for tuning range of electronic tuner

Info

Publication number
JPS5694818A
JPS5694818A JP17366379A JP17366379A JPS5694818A JP S5694818 A JPS5694818 A JP S5694818A JP 17366379 A JP17366379 A JP 17366379A JP 17366379 A JP17366379 A JP 17366379A JP S5694818 A JPS5694818 A JP S5694818A
Authority
JP
Japan
Prior art keywords
voltage
band
limited
diode
conducts
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
JP17366379A
Other languages
Japanese (ja)
Inventor
Tsuyoshi Kondo
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 JP17366379A priority Critical patent/JPS5694818A/en
Publication of JPS5694818A publication Critical patent/JPS5694818A/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

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To limit the receiving band to a necessary range and at the same time prevent occurrence of a disturbance to the undesired frequency, by limiting the tuning voltage to be supplied to a variable capacity diode down to the prescribed range by a clamping circuit. CONSTITUTION:When the band switch 4 selects a high band in the VHF band, the signal VH turns to a high level to turn on and off the transistors TR1 and TR2, respectively. Under these conditions, the turning voltage VT is increased. And thus the diode D1 conducts when the voltage VT becomes higher than the voltage Vmax set by the resistance VR1. AS a result, the voltage VT is limited to the voltage Vmax. On the other hand, the diode D2 conducts when the voltage VT is reduced. As a result, the voltage VT is limited to the voltage Vmin set by the resistance VR2. Such limitation can be used effectively in case when the reception frequency is limited.
JP17366379A 1979-12-27 1979-12-27 Limiting circuit for tuning range of electronic tuner Pending JPS5694818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17366379A JPS5694818A (en) 1979-12-27 1979-12-27 Limiting circuit for tuning range of electronic tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17366379A JPS5694818A (en) 1979-12-27 1979-12-27 Limiting circuit for tuning range of electronic tuner

Publications (1)

Publication Number Publication Date
JPS5694818A true JPS5694818A (en) 1981-07-31

Family

ID=15964786

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17366379A Pending JPS5694818A (en) 1979-12-27 1979-12-27 Limiting circuit for tuning range of electronic tuner

Country Status (1)

Country Link
JP (1) JPS5694818A (en)

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