🚀 go-pugleaf

In article <1993Jan5.165339.2659@vax1.mankato.msus.edu> 
ven0103@vax1.mankato.msus.edu writes:
>Hello!
>
>	Does anybody know a place where I can order delay lines for TV sets?
>
>	I need two different times delays:
>			1 micro second.
>			64 micro seconds. (There's one with 
>the reference DL710
>but a different one may work too.)

In a typical colour television set a one scan line delay (63.55us for
NTSC and 64.00us for PAL) is done with a glass block and acoustic 
transducers. Shorter delays of a few to a few hundred nanoseconds use
lumped constant LC 'all pass networks'. I'm not sure what you need to
do a 1 micro sec delay.

There is an alternative to the glass block by using a CCD delay
line and these are used in tv cameras and camcorders. They require
a clock which is often a multiple of the colour subcarrier frequency.

Anyway, my advice would be to find a service manual for a tv set,
and order 'spare' parts from the manufacturers parts warehouse or a
local tv/electronics parts shop that will special order these items.

The second suggestion is to find an old tv chassis and cannibalise it
for parts.

Either way the glass block delay line will require a matching coil at
each transducer so don't forget to order those too.

Finally, if you require a wide bandwidth through these delay lines or
low distortion due to ringing, the consummer tv grade parts may be
unsuitable. Professional analog tv equipment uses higher quality
delay lines which are more expensive.

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Peter J. Stonard        +                                /^\  /^\
Grass Valley Group      +                       /^\     /   \/
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If it looks like; sounds like; quacks like; an Opinion. It's mine.