Wired remote control with an increase in the number of received channels. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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TV owners with a program selection device such as SVP-4 (and its modifications) can increase the number of received TV channels up to 10 by simply modifying the SVP using a wired remote control.
The above scheme (Fig. 1), designed for 8 channels, has been successfully operating in conjunction with the SVP-4-5 (ZUSTST) for more than 5 years and does not affect the operation of the SVP in the normal mode.
The circuit contains the M1 module and the remote control. The choice of one of the 8 channels is carried out by microswitches SA1...SA4 depending on the position of the switches SA5, SA6. Volume control within a small range is carried out by the R3 knob.
Since there are no indicators in the M1 module that can be installed if desired, when the 7th and 8th channels are turned on, the indication of channels 2 and 6 lights up, respectively, which is some inconvenience.
The refinement of the SVP consists in breaking the connection of terminals 8, 9 and 10, D4. The M1 module is mounted on a separate board inside the TV. Connection VD2, VD4 is carried out to one of the resistors R52, R56, R60 - depending on the selected range. The R3 regulator is included in the gap between contacts 6 of connectors X9 (A1) and X9 (A9).
Setting up the 7th and 8th channels is carried out similarly to the first six channels using R1, R2 with the APCG turned off.
Instead of double switches SA5, SA6, you can use single microswitches similar to SA1...SA4 (Fig. 2).
If the number of received TV channels exceeds 8, the number of channels can be increased to 10 by assembling another M1 module. In this case, it is necessary to connect pin 11 D2 with pin 4 D4, having previously disconnected pin 4 D4 from the "ground" (for SVP-4-5, SVP-4-6, SVP-4-7).
Construction and details
The M1 module is made on a piece of foil-coated getinax, the size of which depends on the size of the parts to be installed, by surface mounting. The remote control is made in a plastic case from a toothbrush (180x25x25 mm) with the installation of SA1...SA6 and R3 in the slots in the top cover of the case. For convenience, SA1...SA4 are placed in pairs. SA5, SA6 - small switches МТ-3; SA1 ... SA4 - MTZ-1 microswitches; R1, R2 - 100K, any type; VD - D220B; R3 - preferably SPO-0,5 (to fit in a case).
The connection of the remote control with the TV is carried out with a MGTF wire of small diameter of the required length.
Literature
- Sokolov BC Devices for electronic selection of TV programs. -M, 1992.
- Elyashkevich S.A. Color TVs ZUSST. - M, 1990.
Author: R. Yareshko, Kharkov; Publication: N. Bolshakov, rf.atnn.ru
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