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