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Hawk-Woods MDV Link System question. 16mm camera battery.

Hawk-Woods mdv link system kinor 16 cx 2m 16mm camera 12v battery solution aaton arri film mdv cinema

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#1 Vadim Trofymenko

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Posted 25 December 2012 - 02:43 PM

Hello, I have a question about Hawk-Woods MDV Link system. I have a 16mm camera which requires a 12v 5-7A power source with 4-pin XLR out. At the moment I'm using a sealed acid motorbike battery, but it's heavy and it takes ages to charge it.

The question is: can I use a Hawk-Woods DV-F970 LLithium-Ion Battery ( which is 7.2V 47W 6600mA) and Hawk-Woods DV-XLRR MDV 12V Step-Up Power Adaptor to power the camera?
I'm not really good at electricity, please help me.
Thank you.

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#2 Phil Rhodes

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Posted 25 December 2012 - 04:38 PM

Sorry, no - the adapter doesn't have the current capability to run the camera.

The way you said it, it sounds like the camera needs a 12V power supply from which it may draw five to seven amps, which is probably reasonable for a 16mm film camera. That's up to 12V x 7A = 84 watts. The DV-XLRR adaptor can only provide 12 watts, which basically means it's limited to one amp. Even if you could draw more than seven amps from one of those tiny DV batteries, it would only last a few minutes.
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#3 Vadim Trofymenko

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Posted 25 December 2012 - 04:40 PM

Thanks for the reply Phil. That's clear it.
Can you advice something similar to dv link system, or something around £200 that would be light and charge under 5 hours?
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#4 Phil Rhodes

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Posted 25 December 2012 - 05:39 PM

Difficult. Batteries are expensive, as you have found!

For that money you could build some simple nickel cadmium or nickel metal hydride batteries as I suggested in the other forum thread which would charge in a few hours. If you don't want to do that, I think about the best solution is probably that DeWalt power tool battery adaptor you found. Perhaps you could find an old, broken power tool and use its battery mount. I'm sure that's all they're doing.

You could also look around and find some old NiCd PAG or Anton-Bauer batteries, and replace the cells.
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#5 Vadim Trofymenko

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Posted 25 December 2012 - 05:42 PM

Phil, thanks a lot! About DeWalt, how do I connect it to the camera?
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#6 Vadim Trofymenko

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Posted 25 December 2012 - 05:52 PM

This one looks promising, but how do they do itPosted Image
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#7 Phil Rhodes

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Posted 25 December 2012 - 05:54 PM

Cut one of these in half?

(Actually, it looks like they're just removing the swivel flashlight head)
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#8 Vadim Trofymenko

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Posted 25 December 2012 - 05:56 PM

Looks great! But how many Amperes it has? I need at least 5A...
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#9 Phil Rhodes

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Posted 25 December 2012 - 06:48 PM

Amps are a measure of capability; most NiCd packs could deliver 5A for a short time at least. I would expect the DeWalt batteries to be fine for your 16mm camera, but you may wish to measure the actual current draw while the camera is operating. Most film cameras draw a lot of current while getting up to speed, but less when operating. Well-maintained and properly (not excessively) lubricated cameras will consume less power.

This is even cheaper, if you can find some suitable batteries. I'm tempted myself.
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#10 Vadim Trofymenko

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Posted 25 December 2012 - 06:50 PM

Phil, I think I've found a solution. What do you think?
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#11 Phil Rhodes

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Posted 25 December 2012 - 06:58 PM

I'm sure it'll work fine, although it's lead acid and it will have the same long charge time as any other lead acid.
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#12 Vadim Trofymenko

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Posted 25 December 2012 - 07:01 PM

Well yeah I know, but... I don't know how to make a DeWalt to 4pin XLR adaptor.
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Edited by Vadim Trofymenko, 25 December 2012 - 07:05 PM.

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#13 Vadim Trofymenko

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Posted 25 December 2012 - 07:04 PM

Plus I'm worried about my electronics...
Last time I've measured camera running on a lead acid battery it was 12V 5A minimum. DeWalt batteries are 12V 3A maximum. Of course I can use a 18V DeWalt like some folks do with Arri, but the problem is that my camera doesn't have a protective system on it. :(
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#14 Phil Rhodes

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Posted 25 December 2012 - 07:06 PM

That's just one of those flashlights with a 4 pin XLR connector in the top.

Buy the flashlight and the connector, figure out how to mount it somehow, and you'd probably only have to solder two wires.

I'm not sure how they're making that one work as it uses the 18V batteries, but you could simply use the 12V flashlight and the 12V batteries.
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#15 Vadim Trofymenko

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Posted 26 December 2012 - 10:10 AM

I think this flashlight has perfect shape for XLR connector. Althrought it isn't cheap ;)
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#16 Vadim Trofymenko

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Posted 26 December 2012 - 10:15 AM

But again, I'm worried that it won't be able to run 400' magazine.
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#17 Jean-Louis Seguin

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Posted 26 December 2012 - 10:35 AM

Which camera do you have?

Some cameras can safely be run from 13.2VDC or 14.4VDC which gives you a great advantage as a lot of cameras have an operational cut-off point of around 11VDC.

For our Aaton cameras, we have been successfully using 13.2VDC NP-1 type batteries with the appropriate adapter.

If it can take 14.4VDC safely, you can look into Lithium-Ion options which can be fast charged with the right charger.

For something inexpensive, I can recommend the products of http://www.all-battery.com/. I've had a few problems with certain specific products but overall they are pretty good to deal with.

Cheers,
Jean-Louis
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#18 Vadim Trofymenko

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Posted 26 December 2012 - 10:36 AM

Jean I have a Kinor 16 CX 2M camera.
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#19 Vadim Trofymenko

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Posted 26 December 2012 - 11:23 AM

Just spoke with a technician who knows Kinor cameras and found out that motor takes maximum voltage of 14.4V. I don't want to use 12V 3A because I'm afraid it won't be able to take 400' magazine, not for long at least.
I'll buy a DeWalt 14.4V 3A battery with charger and try to connect it to the camera.
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#20 Jean-Louis Seguin

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Posted 26 December 2012 - 01:02 PM

Beware: If the maximum safe voltage is said to be 14.4VDC, it may not be safe to use a 14.4VDC battery because a fully charged 14.4VDC battery can output up to 17VDC.

Probably safer to stick to a 12V with higher capacity.

Jean-Louis
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Also tagged with one or more of these keywords: Hawk-Woods, mdv link system, kinor 16 cx 2m, 16mm camera, 12v battery solution, aaton, arri, film, mdv, cinema

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