JPS5994437U

JPS5994437U - electronic tuner

Info

Publication number: JPS5994437U
Application number: JP19019782U
Authority: JP
Inventors: 松下　良昭; 藤田　祥二
Original assignee: 三菱電機株式会社
Priority date: 1982-12-14
Filing date: 1982-12-14
Publication date: 1984-06-27

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の電子チューナの回路図である。第２図および第３図はこの考案の実施例の回路図である図において、３は同調電圧発生回路、４は帯域切換回路
、５ａ、　　５ｂ、・・・、５Ｎは発光ダイオード、７
ａ、　　７ｂ、・・・、７Ｎは逆電圧防止ダイオード、
８ａ、５ｂ、−，５Ｎは第１のスイッチ、８ａ′。８ｂ′、・・・、８Ｎ′は第２のスイッチ、４１Ｌ。４１Ｈは帯域切換回路の制御端子、１２．１３は電圧制
限トランジスタ、１４．１５は抵抗を示す。FIG. 1 is a circuit diagram of a conventional electronic tuner. 2 and 3 are circuit diagrams of an embodiment of this invention, in which 3 is a tuning voltage generation circuit, 4 is a band switching circuit, 5a, 5b, . . . , 5N is a light emitting diode, and 7
a, 7b,..., 7N are reverse voltage prevention diodes,
8a, 5b, -, 5N are first switches 8a'. 8b', . . . , 8N' are second switches 41L. 41H is a control terminal of the band switching circuit, 12.13 is a voltage limiting transistor, and 14.15 is a resistor.

Claims

[Claims for Utility Model Registration] A first switch that is turned on by tuning to apply a predetermined voltage from a tuning voltage generation circuit to the tuner through the switch, a light emitting diode having a voltage applied to its anode, and a light emitting diode having a voltage applied to its anode; a second switch directly connected to the cathode and turned on to set the cathode to a reference potential and cause the light emitting diode to emit light; the first switch and the second switch are switched in conjunction; a band selector switch having one terminal which is connected to the switch No. 2 and becomes a reference potential when the switch is turned on; the band selector switch has at least two other terminals which are selectively connected to the -10,000 terminal; a band switching circuit comprising at least two control terminals each connected to at least two other terminals, and applying a predetermined band switching voltage to the tuner in response to the voltage of the control terminal; An electronic tuner including a transistor inserted and connected in series between a terminal and a control terminal, and having a base applied with a voltage equal to or lower than the reverse withstand voltage of the light emitting diode.