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Gear / Technical Help => Remote Power => Topic started by: Sean Gallemore on August 28, 2003, 05:27:48 PM

Title: some explain this to me please
Post by: Sean Gallemore on August 28, 2003, 05:27:48 PM

Cars only need 12Vs to start, why do some small ass mic caps need 48V phantom power to run?  Is it the difference between AC and DC current?  It just seems like a lot...

Title: Re:some explain this to me please
Post by: MattD on August 29, 2003, 12:09:53 AM

First, "DC current" is redundant. It's alternating current and direct current.

Cars need a shitload more than 12V. I am not entirely sure why 12V was chosen for the battery - perhaps for the other things running on the car's electrical system. The 12V is stepped up to 100,000V by an inductor before the current is fed to the spark plug. The voltage needs to be that high so the current will arc ("jump" from one metal point to another).

Likewise, I'm not sure why 48V was chosen. It may just be the smallest amount needed to polarize the most common types of capsules. Anyone?

-Matt

Title: Re:some explain this to me please
Post by: Sean Gallemore on August 29, 2003, 02:09:52 AM

starting to make sense, thanx & +T