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Cheapo video distribution amps.


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#1 Jess Haas SOC

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Posted 03 March 2008 - 03:32 AM

Anyone tried any of the cheapo DAs being marketed to people doing car av installs? Here is an example: http://www.buy.com/p...1/90129568.html

I don't feel like spending much because most of the time I really don't think it is necessary, but I did a shoot the other day where the video tap image was rather dark to begin with and I was thinking a DA could be a good idea.

The question is will something like this result in a better or worse image than I get without it? Currently I have my monitor, archos and video transmitter all terminating.

~Jess
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#2 Robert Starling SOC

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Posted 03 March 2008 - 10:20 AM

Anyone tried any of the cheapo DAs being marketed to people doing car av installs? Here is an example: http://www.buy.com/p...1/90129568.html


DAs are not very expensive in the scheme of things. VAC makes about every variation you can imagine. I had Terry West put a 1x4 internal in my Clipper 2 and my Clipper 24 and they work great. The DA was less than $120 I think and is about the size of a little box of matches. They also make a tiny one that powers with a 9v battery.
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#3 JimBartell

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Posted 03 March 2008 - 12:33 PM

A Video DA is basically a quad Op-amp chip (about $2) in a box. The connectors and box cost more than the guts. If a cell phone can be made for $20 there is no reason a Video D/A can't.

And only one device on a video line should be terminated. And even that is not necessary on wire runs this short.

Jim "cheapskate in a box" Bartell
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#4 Jess Haas SOC

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Posted 03 March 2008 - 02:38 PM

Thanks for the input. I know a VAC one really isn't all that expensive, but I honestly don't feel like it is something I need 99.9% of the time so while I am considering buying a $20 item I don't really feel like spending $120 on it at the moment. Assuming there isn't much in the way of a functional difference between the two it seems the main drawback is that the cheap one uses RCAs while the more expensive one has BNCs. If I really feel a need I may pull out my soldering iron and change that, and if I feel really crazy I might repackage the whole thing adding lemos or something for input and monitor output in order to streamline the package. Hopefully the 12v input on the thing can handle my 14.4v batteries. So far I have found that most things designed for car use don't have a problem with them.

~Jess
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#5 Wolf Seeberg

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Posted 08 March 2008 - 01:19 AM

HERE THE $ 200 PRO VERSION OF THE $ 2 CHIP
iF YOU ORDER 3 MILLION i CAN SELL THEM FOR $ 2.21
THNAKS WOLF IN la Attached File  DA_mini.doc   188.5KB   36 downloads

http://www.wolfvid.c...ets/DA_mini.pdf
Attached File  DA_mini.doc   188.5KB   36 downloads
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#6 G. Grammatikos

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Posted 10 March 2008 - 06:10 AM

i have buy the same vda from canford for 140euros 3-4 years before ,but the problem is that it work only with the 9volt battery and not with steadicam power ( i try it ,and i use a regulator but the problem is that power remix with video signal (english polarity) but it work perfect with 9v battery,try to find it at canford catalogue i suppose that it cost less than 100 euros
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