B/W monitor for spec.
ZXNet echo conference «hardware.zx»
From Kirill Frolov → To Alexander Bondarenko 9 September 2001
Press RESET immediately, Alexander!
08 Sep 01 11:00, Alexander Bondarenko wrote to Kirill Frolov:
AB>>> Yes, and I heard here that normal people do this through a transistor
AB>>> they hook up with the air conditioner. But how exactly - I don’t get the hang of it. Yes and no
AB>>> I understand analog.
KF>> Find the diagram of Leningrad (composite, scorpion, kaya...)
AB> I was actually wondering if anyone had this business to throw here.
Repeater for RGB
+ +5v
|
|
/
500 |/
----RRRRR----|
digital |\n
R,G,B_|
| emitter
| 27
+----------RRRRR--> R,G,B to TV
R
R 200
R
__|__
And this is an adder; the same signals that go to the TV are supplied to the input:
+------+- +5v
R |
R 680 |
R/
digital | /| | |/
SYNC ---|< |--------+---|
| | | |\n
| _| emitter
500 | |
BLUE ----RRRRR------+ | 1.2k | | 27
RED ----RRRRR------+ +-------RRRRR----> Video to monochrome monitor
2.5k | |
GREEN ----RRRRR------+ R 200
R R
R 1k R
R |
+------+
__|__
From Dmitry Lomov → To Kirill Frolov 9 September 2001
Hello, Kirill!
Once, Fri Sep 07 2001 23:35, Kirill Frolov wrote to Alexander Bondarenko:
AB>> (black looks bright because of this). In short, contrast
AB>> unhealthy.
AB>> I picked up this thing from ordinary RGB through inverters and then
AB>> tuning
AB>> summary (my computer is Pentagon).
AB>> In short, people, if you’re not a hack, please advise what’s best to do here.
AB>> Of course, I understand that the question is stupid, but it just doesn’t work out!
KF> Inside the spec (Zonovsky) there is an RGB adder. which forms
KF> brightness and sync signal. Do it as it is. You need one KT315.
KF> Only there the resistors for RGB are specified as (1):(2):(4), and you do
KF> something like (1):(1.2):(2.5)
no, this is not good. colors (gradations) will merge.
KF> and then the contrast will be normal.
Contrast is the range of the video signal. reduce the scope while maintaining
proportions and synchronization level, you can reduce the resistors in the divider (Zonov,
like 680 to 1000).
Best wishes.
Dmitry. [ZX] [Quake]np: The Baetles - Maxwell's Silver Hamme