Buzz #05 19 мая 1997

Доработки     Железо

Iron - Connect your computer to the vacuum tube TV set series "700" (completion ZX-Spectrum and TV).

                       *** IRON ***



  Connect your PC to a TV set VALVE SERIES "700"
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   Color TVs Horizon, Rainbow and others with an index of 700
lamps 6ZH5P with Chroma amplifiers bad "fit together" with
Computer ZX SPECTRUM. Color is always willing to be better for 
the elements of the image, the letters appear repetitive and 
stripes, shadows. 

   The following improvements to the strength and novice 
amateurs will get rid of these weaknesses and get a good color 
image when using conventional TV kompyuterom.Kachestvo programs 
is not affected. 


                    MODIFICATIONS ZX SPECTRUM

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   Here it is necessary to change the RGB output signal.
1. Resistors 27 ohms and 200 ohms to disconnect from the 
circuit. 2. In the corner on a free sheet of card to install 
four podstroech    GOVERNMENTAL resistor 220 ohms, and the same 
constant - 

   27 ohm and connect them to the scheme (Fig. 1):


                                  R5 C1 + VIDEO

 February 13 R1 5Ў10 uF

   14 R1-R2: 220 ohms

                         R5-R8: 27 Om
March 12 C2-C4: 0,1

    4
 May 1910 R6 C2

   11 R
 June 9 R2

    7 R7 C3

                                                             G

   A3 R3

                                 R8 C4

                                                             B

            R4 Fig.1

3.Mikroshema D36 555KP11 must be installed on the panels.

  Instead this chip is placed 555KP14, or color on the screen

  will not match the true one.
4.Signaly RGB output through the capacitor 0,1 uF; VIDEO 
(SYNC)-through 

  capacity of 5.10 uF, taken one of them, which will give a 
better color   Noe izobrazhenie.VIDEO is usually taken for 
black and white   of the image.


   Connect your PC to TV can do the usual assembly
wire up to 4 meters. These wires should be 5: SYNC, R, G,
B, a common wire (ground).


                      MODIFICATIONS TELEVISION

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   1.For connect your computer to the TV needs a low input, and 
"VIDEO". In some of the TV it is, in other not, but there is 
access to a tape recorder. In any case, on-board video channel 
(vertical left, if you look back), there are three pins, the 
average of which (2) connected to the base of the transistor T9 
KT315 (see schematic diagram TV). Jumper these pins are 
switched to receive TV (1-2) or to accept low "VIDEO" (2-3) 
(Fig. 2). To work with a computer jumper is placed on pins 2-3.


  TV TV
 >>

          January 1

         > S1>

          2 to the base of \ 2 to the base

         > T9 KT315 \> T9 KT315

          March 3

         >> All cables,
 >> Let down by
 Bass Boost VIDEO MOVIE S1 should be
(Ekranir.) (ekranir.) screening!



      Figure 2 Figure 3

   That every time you do not remove the rear cover, parallel 
pins connect a toggle switch or pushbutton switch P2K. 
Ustavlivaem it down on a vertical plastic plate, which already 
placed "tone high and low," etc. Connecting: S1-wire screen in 
accordance with the scheme (Fig. 3). Remove the jumper at all. 

   If the TV video input is missing, the same plastic plate 
next to the toggle switch must be installed 5-pin socket. In 
extreme cases, you can use an existing access to the tape, but 
the nest must still be byti 5-pin. Inside TV you can unsolder 
arbitrarily, eg pin 1 connect with pin 3, 2-foot ground from 
pins 3,4,5 wires go to amplifiers tsvetnoraznostnyh signals - 
to the panel. grid of the tube 6ZH5P through the switch (see 
below). 

   2nd Best image quality is achieved, "severance" from the
These lamps previous scheme. To do this on the board color do 
the following: a) directly to the first legs of the 3-tube 
sockets lamps 6ZH5P (Simp. mesh see the concept of TV) of the 
assembly Solder resistor 0.5 ohm resistor 470-680. Solder the 
other end of resistor to ground "land". This absolutely no 
effect on an ordinary TV picture. b) The print wires going to 
the 1-m legs tube sockets, cuts themselves around the legs. It 
is the first leg is now necessary to file a RGB signal from the 
computer. But to be able to work with your computer and watch 
TV-transmission, to the point of discontinuity, connect one 
constructed pereklchatel type P2K - returning after the next 
pressing. Conductors, connections will be about 10 sm.dlinoy. 
It also does not affect the TV-transmissions and has no values 
​​when using the computer. 

   Compound was performed according to the scheme (see Figure 
4). It must be remembered that when the board is vertical, the 
upper lamp - red, Medium - "green" and lower - "blue". So in 
the TV "Rainbow 719-1. 

   More correctly it would install next to each p / lamps and
pins (on the board BRC) on the relay type REF 10.15 and include 
them in one set tumbler. Relays can be powered by 
current-limiting resistors, the voltage 24 VV present case, 
this switch is displayed in the lower right corner of the 
square "vents" and back Kryzhko TV.


   The overall wiring diagram is shown in Figure 5


               to cut so done with

                conductors. each of the three

              \ P / lamps on the block

               \ To the first leg color.

             S2 w / Lamp 6ZH5P.


                       470 ohms Fig.4



                                                           TV
to D39 \ S1 loudly. \

                                               \


    51k (ekranir.)
SYNC


    R

    G

    B \ R
 SPECCY


                   Figure 5 \ G

                                                        S2


                                                         \ B



                      ORDER SETTING

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   Connective cord from the computer to plug and socket on the 
TV TV lamps to be "ring a chime, so that each signal from the 
first incident on the place of the latter. 

   Enable TV on any program to warm up.

   Enable switch S1. The image disappears.

   Enable switch S2. Ideally the screen should be as belym.No
e-gun CRT projectors x have the current spread, the screen may
be stained by any of the primary colors: red,
blue or green, most likely. To eliminate this phenomenon, you 
must first memorize the position of trimmer potentiometers (see 
the concept of TV) R44 (red), R46 (green), R47 (blue) on the 
block scans. They are located at the bottom of the unit on 
textolite board when viewed from behind. 

   Further, if a touch-up, say green, have a screwdriver with 
an insulating handle krutnut R46 (top) anti-clockwise and 
watching the screen, get a white screen. 

   After working with SPECCY, if you need to watch TV 
transmission, it is necessary return this resistance in the 
former polozhenie.Eto is a significant drawback of this method 
of connection (and actually it can and not to be - it all 
depends on kinescope). 

   On the contrary R44, R46 and R47 at the rear cover must be 
drilled on hole diameter of 6-10 mm.


   Connecting the plug to the TV and turn on ZX. You should see 
a proprietary label. 

   Upload rasprostanennuyu program TEST-PROG where there are
colored band with two shades of brightness, or if you are
happy owner PENTAGON'a 128K in the initial menu, hold
BREAK SPACE key and click on RESET. After that, the screen 
shows colored bands. Resistors R44, R46, R47, handles 
"brightness" and "contrast" woo-quality images and get to work.


   At VLF TV can display and sound. The signal from the ZX 
should be taken with the 2-nd foot chip 555TM9 D39 and through 
resistor (5.1 k) (as concept, the conclusion "ZW") apply to the 
movable contact variable resistor TV "volume". In this case, 
the wire must be shielded to take. 

PS: These improvements made personally by me (DYKSOFT'om) with 
TV 

      Rainbow 719-1.