Hello all, I have what is probably a rather simple problem for an electrical engineer or someone who knows a bit about video signal buffering or op amp selection for analog video applications, but these are not my areas of expertise unfortunately.
Basically what I’m trying to do is convert a video tape player that originally only has composite video output into having S-Video output. I’d like to be able to do this with betamax and VHS players and possibly some others. These formats store their luma and chroma data signals separately on the tape and these signals are usually kept separate within the player until they are joined into composite right at the output.
It hasn’t been too hard to actually locate valid chroma and luma signals on video boards, however, they are not at standard S-Video levels - say luma and chroma might be half of what their peak to peak values would need to be for standard S-Video and my guess is that they’ll drop even lower without some type of buffer or op amp once they are put under the usual 75 ohm load.
My question is whether there’s a (hopefully) simple circuit that I can can try to boost these existing chroma and luma signals to levels that are usable for a standard S-Video out that will have a 75 ohm termination. Ideally it’d be some type of Op Amp that buffers the signal so that loading the output down doesn’t affect the existing circuitry or input signal. I would imagine it would contain a couple of variable resistors to fine tune to the desired output levels as well.
I also understand that different op amps have different noise and bandwidth profiles and I do not know what would be ideal for these analog video formats, so I’d like specific part numbers suggested if possible and a crude drawing of how it might be wired up to try. It’d also be ideal if this can be accomplished with a single input voltage to the ICs as opposed to say BOTH plus 5V and minus 5V as some op amp applications require.
Any help is greatly appreciated!
