This is RGB To Monochrome converter by using Matches impedance of PC to a B/W or CCTV monitor technic.You can get away with running a monochrome monitor on GREEN, but this looks real crappy when viewing color images. These simple resistor networks allow you to display R+G+B on a B/W or CCTV monitor without ghosting. Be shure to set your video card for 60Hz interlaced. Most video cards do give you Csync out on H. You can also run an OLD monochrome EGA or VGA monitor like this, but be shure to hook up the Vsync. This will not work on TTL monitors. source

The circuit transmits 200MHz (-3dB bandwidth) video signals while stripping off the sync pulse and performing DC restoration. It is configured for a typical video cable driver application driving a double-terminated 75Ω load, where the EL8102  is configured for a gain of +2 to ensure unity gain throughout.source

This signal generator uses a three channel DAC to generate Composite video signal (CVBS) and S video signal (Y/C separated) at the same time, left one channel is not used in NTSC format. It is assigned for one of the color components of Y/CB/CR video format. This feature was not planned some years ago, but it has been added when started to draw the schematic this year, because NTSC television system might be obsoleted in the near future. The two different video format, component video and NTSC video, work in exclusive.source

This is a simple display controller. It can be controlled with a small microcontroller, such as MCS51, 68HC11, Z80, AVR and others.However, it is not suitable for practical use because the microcontroller is occupied in synthesizing video signal, it cannot process any other operation. The CPLD used for main controller is XC95108(PLCC). It has 108 macrocells and 69 I/O port(some have gloval function), so that it is just suitable for this project.Most function is integrated into the XC95108, therefore, number of parts and wires could be reduced. The CRTC block is counter array to generate display timing. The timing controller block is the main logic to arbitrate between host access and display access to the video buffer.source

Here is the simple Video amplifier.Part List are used :R1=1Kohm C2-6=100uF 25V C6=100uF 25V R2-3=12Kohm C3=100nF 100V IC1=LM359N R4-5-6=10Kohm C4=1pF ceramic J1-2=BNC connector C1=10nF 100V C5=10nF 100V.source