In message , XYGAX writes >Have you thaught of those delay lines they use in TV sets they are analouge >but I dont know if the delay is a fixed time period but it might be worth a >look. The chroma delay line (PAL not NTSC!) delays one line period, that's 64uS for PAL 625 line transmissions. It's designed to delay a 4.433MHz signal, so doubt it could be used for anything else - basically it feeds the signal into one edge of a piece of glass/plastic and then picks up the vibrations at the other end. The luma delay line is FAR! shorter, I don't know how short but think it must be around 1uS or less. These seem to work by just feeding the signal through a long piece of wire coiled around a former, the delay is the length of time it takes to travel down the wire. Some of the very old TV's used a piece of coaxial cable (coiled up) as the delay line. >Distant memory havent fixed TV's for years and then it was only the power >supplies and line stages nothing else ever goes wrong with them.... Don't you beleive it! :-). >Bet my telly pops now I wouldn't be suprised :-). -- Nigel. /--------------------------------------------------------------\ | Nigel Goodwin | Internet : nigelg@lpilsley.demon.co.uk | | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | | Chesterfield | | | England | | \--------------------------------------------------------------/