Video Amp Circuit

RichardF

If anyone has a quick and dirty, simple, video amp circuit diagram to send my way, I would appreciate it. I currently am sending my video signal from a CCTV camera over a·50 foot line (see my submersible ROV project in Completed Projects Forum). I want to go to 100 feet, but I suspect I will need a boost in signal level from the ROV to have a good signal at the surface. My CCTV camera output is 1 volt P to P at 75 ohms (standard NTSC). Having just made my first video recordings, I see what appears to be noise (light snow on the screen) affecting the picture. This is only going to get worse as I increase the tether length. If I boost at the source, I can then filter out the noise at the video recorder input. My tether is not shielded (don't want it to be).
Thanks,
Richard

pwillard

You can make a video driver from a now hard to find chip from Analog Devices (available at BG Micro pretty cheap) called the AD815. http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=11814 for about 2 bucks... (10-12 bucks anywhere else, I figure)

It is a high current driver IC that is cabable of handling a high bandwidth video signal.· Everything you need for your solution should be in the data sheet.

http://www.analog.com/UploadedFiles/Data_Sheets/AD815.pdf





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