Group: rec.arts.movies.production.sound
From: Larry Fisher
Date: Wednesday, September 12, 2007 9:44 AM
Subject: Re: 12 Volt DC Cable Length

Hi Doug,
The key here is that the current is fairly low, a tenth of an amp,
which makes up for the high resistance.
Best Regards,
Larry Fisher
Lectrosonics

On Wed, 12 Sep 2007 07:28:43 -0700, "Douglas Tourtelot"
wrote:

>Really? Wow, I would have thought that it wouldn't work. Learn something
>every day.
>
>D.
>
>"Larry Fisher" wrote in message
>news:pssfe39gs8kbqpi94d3qgacprbihd3j97h@ ...
>> Hi Scott,
>> Here's the numbers:
>> Assume the device is pulling 100 mA (that's high). One hundred feet of
>> #22 out and back is Ohms ( Ohms/1000'). The voltage drop will
>> be I x R or .1A x Ohm= Volts. A third of a Volt is
>> negligible. In short, a run of #22 hundred feet will be fine and 300
>> feet is workable (1 Volt drop).
>> Best Regards,
>> Larry Fisher
>> Lectrosonics
>>
>>
>>
>> On Tue, 11 Sep 2007 17:34:47 -0700, scottclem@ wrote:
>>
>>>How far can you effectively run 12 Volt DC down a piece of Canare
>>>cable? I was thinking of making my Comtec and IFB transmitters so I
>>>could run them out 100 feet if needed. It would be great if I could
>>>send them power from my PSC Power Max supply. I may just have to
>>>resort to a NP1 if I need to run them out.
>>>
>>>Just curious,
>>>scott
>