The past decade has a significant increase in the intensity of the ether, and cable broadcasting. Viewers, for otherwise exploitative television receivers obsolete models, have problems with reception: six or eight buttons in TV, equipped devices choose the software or devices touch (SVP 4, SVP 4-1, SVP 4-5, SVP 4-6, SVP-403, MIM-2, CIP-1-1, CCA-U-75, etc.) cannot provide switching capabilities all needed programs.
There are several ways solution to the above issue:
1) buy a new modern television receiver,
2) using the block selection television programs VCR (if the condition that exists),
3) replacement of obsolete device of choice programs like AEP, MEP, DIP, CCA, MU-48 and others on the management module TV 5(6)-th generation,
4) finalization stale device selection so that to increase the number of selectable television programs
The first two solutions the problems will require material costs, third the path for the majority of viewers can be considered optimal. However, 't be denied shadowmonster revision of the existing device selection programs, especially if the number of TV broadcasting programs in the region does not exceed 12,16 and preference minimal financial costs.
Proposed revision TV "horizon" (TC-D), allowing to double the number of received TV programs when minimal changes in the normal device choice of programmes. A fragment of the revised scheme it is shown in Fig. 1. In module settings MN-4P additionally introduced block potentiometers settings, eight decoupling diodes and Combi-switch for Additional block potentiometers settings (positional the RP designation) is similar to the block potentiometers, used in the module MN-411 (POS designation R11, type CPG-42). Decoupling diodes VD3-1 VD P -1 exclude the mutual influence of variable resistors Multiple switch SA1 allows to implement switching between main and additional blocks potentiometers settings.
It should be noted that the proposed circuit design can be used when refining and other TV models class ZUSTST and USCT. As an example in Fig. 2 shows the revised scheme selection device programs CIP-1-1, which is part of TVs "Photon TC-DE)".
Diodes VD3-1, VD11-convenient 1 be placed directly on the resistor the Assembly RP, solder them to the appropriate conclusions ladies movable contacts of the potentiometers. Resistor the Assembly should be mounted on the PCB of the module MN-411, and the switch in any convenient for installation and location management.
Electrical connections it is desirable to perform a belt or cable single conductors, tied into a bundle. This solution is simple, but has a slight disadvantages.
Switch SA1 has to do manually, and the ability to customize to 16 channels suits far not everyone. These operational inconvenience pay off simplicity and low cost and time to implement improvements.
Author: Yu Puzenko, Kyiv; Publication: www.cxem.net