CN2189370Y

CN2189370Y - Frequency channel broadening device for TV set

Info

Publication number: CN2189370Y
Application number: CN93241861U
Authority: CN
Inventors: 王树斌
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-09
Filing date: 1993-10-09
Publication date: 1995-02-08
Anticipated expiration: 2003-10-09

Abstract

The utility model relates to a frequency channel broadening device of a TV, which comprises tuning potentiometers, a band switch and a channel conversion switch. The utility model is mainly characterized in that the channel conversion switch is a plurality of double-pole synchronous switches, the band switch is a plurality of single-pole three-position switches, the number of the tuning potentiometers is equal to the number of the double-pole synchronous switches or the number of the single-pole three-position switches. The frequency channel broadening device can add seven, fourteen, twenty-two or more channels on the basis of the original piano key type black and white or colour TV sets produced early, and has the advantages of accurate effect and easy loading.

Description

Frequency channel broadening device for TV set

The utility model belongs to the channel expander, is a kind of channel expander that is used for television receiver.

The television receiver of Shi Yonging is touch-tone greatly now, and majority has only eight channels, and the program tricks that TV station broadcasts has exceeded eight covers, in order to see several programs more, people have no alternative but go for program with tuner knob, like this, not only bother but also accelerate the wearing and tearing of potentiometer, in the course of time cause contact bad, just have treadmill and transfer the fault of not putting into effect to take place; Reequip remote controller in addition, but this scheme technical sophistication, expense are big, transform trouble.

The purpose of this utility model is, provides a kind of simple in structure, reequips TV receiver channels expander easily.

The utility model can be realized with following mode:

Channel expander, its channel switcher that comprises trim-pot, band switch and channel switcher is N double-pole synchro switch, trim-pot is N, each switch one end links to each other with the swing arm and the contact 5 of trim-pot respectively, contact 7 is through resistance R ground connection, each switch other end is exit A, VT, one end ground connection of trim-pot, the other end is exit B; Band switch is a N hilted broadsword three-position switch, and three of each switch is exit VL, VH, U.

Advantage of the present utility model:

Circuit is simple, and the extended channel number is 7 or 11 multiple, and accurately and reliably, cost is low, and repacking easily.

Fig. 1 is the utility model electrical schematic diagram;

Fig. 2 is that the 12V power supply is given the figure of tuner supply line through channel switch;

Fig. 3 is that the 12V power supply is given the figure of tuner supply line through triode.

Below in conjunction with accompanying drawing in detail embodiment of the present utility model is described in detail:

1 is trim-pot in the accompanying drawing, the 2nd, band switch, be N hilted broadsword three-position switch, the 3rd, light emitting diode lamp, the 4th, channel button, be N double-pole synchro switch, 5, connect diode or light-emitting diode between 6 two, 5, connect light-emitting diode between 7 two, R is a dropping resistor, and n represents channel, wave band, tuning number is generally 7 or 11 multiple, " X " expression disconnects herein among the figure, A, B, VT, ground, VL, VH, U is the corresponding points that channel expander circuit and teleset line join, and two contacts of an end of each switch 4 link to each other with the swing arm and the contact 5 of trim-pot 1 respectively, contact 7 resistance R that is connected in series, R other end ground connection, contact 6 connects the back contact of band switch 2, and three contacts of switch 2 are exit VL, VHU, the other end of each channel switch 4 are exit A, VT, one end ground connection of trim-pot 1, the other end is exit B.

Embodiment 1:

Fig. 2 is the figure of tuner supply line that takes from the CTP-3905 of Sanyo type color TV set, take up an official post at television receiver and to get a channel switch 4, the get on line of band switch 2 of this channel switch 4 is disconnected, the VT line also disconnects, adjust the trim-pot 1 of key correspondence, making its current potential is the 33V peak, the A terminals of Fig. 1 are connected to the A point place of Fig. 2, the B terminals of Fig. 1 are connected to the B point place of Fig. 2, A end among Fig. 1 obtains 12V voltage at this moment, the B end obtains 33V voltage, point 5 among Fig. 1,6 respectively with diode just, negative pole links to each other, contact 5 and 7 is connected the both positive and negative polarity of light-emitting diode respectively, and when pressing this key of television receiver, the utility model has just been started working, each key by the channel expander can both access program, when other button was pressed on the television receiver, channel expander releasing work was got back to television receiver itself again by key control.

Embodiment 2:

Fig. 3 is the figure of tuner supply line that joint is taken from tree peony TC-483 type color TV set, take up an official post at television receiver and to get a channel switch 4, the get on line of band switch 2 of this channel switch 4 is disconnected, the VT line also disconnects, adjust the trim-pot 1 of key correspondence, making its current potential is the 33V peak, the A terminals of Fig. 1 are received Fig. 3 A place, the B of Fig. 1 terminates to the B place of Fig. 3, A among Fig. 1 terminates on the branch line ball of Fig. 3 at this moment, B hold 33V voltage, the contact 5,6 of Fig. 1 extremely links to each other with the negative, positive of light-emitting diode respectively.Contact 7 is an ignore, and the A among Fig. 1 end is just received on the branch line ball of Fig. 3 like this, B hold 33V voltage, 3 is indicator lights among the figure.

If the channel expander is got 8 (expanding 7) or giving of 12 (expanding 11) selects device not enough, desirable two groups 8 (expanding 14) or 12 (expanding 22), connection is: with on the television receiver one by first group of channel expander of key control, with on first group of channel expander one by second group of channel expander of key control, the rest may be inferred in addition on the television set, expand one group, two groups buttons of device itself all be mechanical interlocking and also be electrical interlock mutually.

The circuit of various button television receivers is had nothing in common with each other, but the function that is realized is identical, and the utility model is applicable to most of button television receivers.

Claims

1, a kind of TV receiver channels expander comprises trim-pot, band switch and channel switcher, it is characterized in that:

The a channel switcher is a N double-pole synchro switch, and trim-pot is N, and each switch one end links to each other with the swing arm and the contact 5 of trim-pot respectively, contact 7 is through resistance R ground connection, each switch other end is exit A, VT, an end ground connection of trim-pot, and the other end is exit B;

The b band switch is a N hilted broadsword three-position switch, and three of each switch is exit VL, VH, U.