Electrohome ECP 4100 Series Instrukcja Użytkownika Pobierz pdf (Strona 3)

Component list

C1 22 uF 10V electrolytic

C2 22 uF 10V electrolytic

R1 2.2 kohm

R2 2.2 kohm

U1 74LS86 or 74HCT86

Simple sync combining BOX

Sometimes you want to use a ready-made BNC cable made for connecting VGA card to high quality monitor.

Those BNC cables have 5 BNC outputs with following functions:

Signal Function Color in cable

------------------------------------------------

R Red Red

G Green Green

B Blue Blue

H/HV Hsync(+Vsync) Black

V Vsync White or Gray

Tha cables are usually built (should be built!) from high quality 75 ohm coaxial cable and 75 ohm BNC conenctors

to guarantee good image quality. You can see a typical schematic of commercial VGA to BNC cable below:

This kind of cable can be used with monitors with 5 BNC inputs. But if you unfortinately have a monitor with RGB

and composite sync inputs only, that cable might not be of any use, unless your graphics card can generate

composite sync signals (this is not a standard option). If you cna get composite sync directly from graphics card,

then it is enough to just connect the H/HV connector to the composite sync pinput of the monitor.

If you are on unfortunate person who deos not have this kind of graphics card or your drivers don't allow using that

option, then your only choice is to build a circuit which combines the separate HSYNC and VSYNC signals to

composite sync. You can see this kind of circuit below.

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Electrohome ECP 4100 Series Instrukcja Użytkownika Strona 3