JPS5694818A - Limiting circuit for tuning range of electronic tuner - Google Patents
Limiting circuit for tuning range of electronic tunerInfo
- 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
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.
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) |
-
1979
- 1979-12-27 JP JP17366379A patent/JPS5694818A/en active Pending
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