CN2138866Y

CN2138866Y - Expanding package for colour television preselect channel

Info

Publication number: CN2138866Y
Application number: CN92223572U
Authority: CN
Inventors: 杨海
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-28
Filing date: 1992-05-28
Publication date: 1993-07-21
Anticipated expiration: 2002-05-28

Abstract

The utility model discloses a pre-select channel expanding assembly for a common electric tuning TV, which is mainly provided with an added pre-select device and a converter for working state of the pre-select device. The pre-select device and the converter are connected to the TV of requiring the added pre-select channel, so that the assembly technology of the utility model can be formed. The utility model has the advantages of reasonable structure, convenient installation and low cost. The utility model is a practical technology increasing the pre-select channel of the common electric tuning TV.

Description

Expanding package for colour television preselect channel

The utility model relates to the manufacturing technology of television set, and particularly a kind of technology that former preselected channel can be increased is applicable to that the preselected channel of common electrical tv tuner machine increases.

According to the interrelated data introduction, China has the preselected channel of the logical colour TV of tens million of Daeporis to have only 8.Along with developing rapidly of tv undertakings, programme channel constantly increases, and utilizes television set as the household electrical appliances that terminal shows, has begun to popularize as game machine, video tape recorder, household PC etc., so 8 channels often can not meet the demands, and bring very big inconvenience to use.

The utility model can not increase the straightforward procedure of preselection switch not change former machine circuit, and former machine preselected channel is doubled.Therefore, having very strong practicality and vast market, also is goal of the invention of the present utility model.

The utility model divides two parts: newly-increased preselector and preselector operating state transducer, electrical schematic diagram is seen accompanying drawing one respectively, accompanying drawing two.Its operation principle utilizes transducer that newly-increased preselector and former machine preselector are worked respectively exactly, and newly-increased like this preselector and former machine preselector can be distinguished 8 channels of preliminary election, have realized the expansion of channel.Available No. 8 channel switch control is changed in the work of new and old two groups of preselectors.The working procedure of circuit is: colour TV start, the BG in the transducer ₂Conducting, BG ₃Conducting, (this state can determine by circuit parameter) makes D ₃, D ₄Conducting.And BG ₁End BG ₄End, make D ₅, D ₆All end.Because A ₁, A ₂, A ₃, A ₄Therefore positive and negative terminal with former machine preliminary election potentiometer and newly-increased preliminary election potentiometer links to each other respectively, makes the work of former machine preselector, and newly-increased does not work.The 1-7 channel selection switch can be selected the 1-7 channel.Again because the state exchange of No. 8 switch controls transducers, so when pressing No. 8 channels of No. 8 switches selections, bistable trigger upset in the transducer makes newly-increased preselector work, and what the 1-7 channel selection switch was selected like this is exactly the 9-15 channel, again by No. 8 switches, be 16 channels, while state transformation, the 1-7 switch of this moment, what control is again the 1-7 channel, thus toward complex transformation.

Further describe concrete connection of the present utility model and use below in conjunction with accompanying drawing.Newly-increased preselector can be put into former machine preliminary election box because volume is less after the debugging.Mode of connection is: with lead with P ₁-P ₈Point (seeing figure one) is received the swing arm contact S of former machine preliminary election potentiometer respectively ₁-S ₈On, (with reference to figure three).The positive and negative terminal lead-in of former machine preliminary election potentiometer is disconnected, be connected to the A of transducer respectively ₂A ₁Point (seeing figure two) is increasing the A that the preselector positive and negative terminal switches through parallel operation newly ₄A ₃Point (seeing figure two).The CP of transducer is terminated on the frequency range switch of No. 8 switch and (see the S of figure three ₉The point).If any type be high potential control, only need diac D ₁D ₂Oppositely get final product (seeing figure two).

Because TV band has only 3, so newly-increased preselector is unkitted the frequency range switch, and corresponding shared with former machine preselector.The 1-3 preselection switch can be located at the L frequency range, be located at the H frequency range 4-7 number, be located at the U frequency range No. 8.

During start, former machine preselector is worked, and at this moment can adjust the 1-7 preliminary election potentiometer previous channel feature of former machine, and when pressing No. 8 switches, LED is luminous, shows newly-increased preselector work, and whole PR at this moment should recruit ₈Previous channel feature, and then transfer the pairing PR of 1-7 switch ₁To PR ₇Previous channel feature.Again by No. 8 switches, adjust No. 8 preliminary election potentiometer of former machine at last.So far, 16 whole preliminary elections of channel finish.The 1-7 switch can be selected arbitrarily in the use, and No. 8 switches are then for by once just making channel be converted to 9-16 by 1-8, or 9-16 is converted to 1-8, conversion and so forth.

Claims

1, a kind of preselected channel extension element of common electrical tv tuner machine is characterized in that connecting one group of preliminary election potentiometer of increase and a preselector operating state transducer on former machine preselector.

2, preselected channel extension element according to claim 1 is characterized in that the preliminary election potentiometer can adopt small-sized variable resistance type.

3, preselected channel extension element according to claim 1 and 2 is characterized in that preselector operating state transducer can adopt bistable trigger-action circuit.