Simple video contrast attenuator

Darren Blake

Active Member
Hi all,

My wireless video sender may be outputting a way-too contrast-y image, which is causing crosstalk onto the audio channels when high-contrast stationary images are displayed (like the Sky programme guide).

To test this I would like to be able to add something to the composite video line out of the sender to knock down the contrast and/or brightness a touch.

Is there a simple circuit that I can build that will do this just to test the theory?

TIA.
 

Darren Blake

Active Member
No one? :(

I'm only after something simple. Would a potential divider work? Any ideas on what value to use for the variable resistor so as not to mess up the 75 ohms impedance matching on the video line?
 

Big Al

Standard Member
What make is your video sender?

Some have a switch which allows differnt contrast settings

Big Al
 

Darren Blake

Active Member
Hi Al.

Its a Digisender X2 (DG200) and yes, it has the contrast switch. I'm on the lower setting and it is still too much.
 
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