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Phantom Power and Mic Capsule Voltage
Phantom Power and Mic Capsule Voltage
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Old 9th June 2021, 03:34 AM   #21
sonnichs is offline sonnichs  United States
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Thanks all for your interesting replies.

Rick-the underwater issue is not a problem here-in fact we have been doing this for years. But I need a quick and simple in-air equivalent mainly to test some processing code and mathematical issues. (no need for the water here which is expensive--besides -I get seasick!)
So this system would simulate some water issues in the code but the only concerns here are to get a set of small mics that I mount in my configurations working with a recorder (probably zoom) and also with our ADC system.

cheers
Fritz
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Old 9th June 2021, 04:36 AM   #22
PRR is offline PRR  United States
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Phantom Power and Mic Capsule Voltage
Quote:
Originally Posted by Mark Tillotson View Post
....True condenser microphones will require a sufficiently high voltage, near 48V....
Some early P48 mikes used the 48V directly for polarization, as well as to drive the buffer.

Today most >$200 mikes (and some under) use DC-DC conversion to take a wide range of inputs. I know the AKG 414 very well, it would accept down to nominal 12V because internally it made regulated 9V for the buffer and jacked that up for the polarization.

"Headroom" is not an issue. The 414 can deliver an incredible (for a mike) 2V. So 9V supply is ample. Few mikes will deliver an honest 0.5V. Doesn't take much.
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Old 9th June 2021, 04:39 AM   #23
MarcelvdG is offline MarcelvdG  Netherlands
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What's this whole underwater thing meant for anyway?
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Old 9th June 2021, 11:13 AM   #24
sonnichs is offline sonnichs  United States
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Thank you Paul. I am using only one brand of mic and one recorder or ADC circuit so I will not have to genericize the range of voltages received. I can pre-calculate it all. I large number of capsules listed have an input impedance of 2.2K and an acceptable voltage range of 2-10V so I just need to provide that. The only concern is being sure I don't overdrive the compliance of the recorder phantom power (or short it) as I obviously don't want to destroy it.

Marcel--underwater mics are used for various things in the oceanography field--visualization, listening to biota, detecting distances for submarines.

thanks
fritz
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Old 10th June 2021, 12:32 AM   #25
Dave Zan is offline Dave Zan  Australia
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Quote:
Originally Posted by PRR View Post
Some early P48 mikes used the 48V directly for polarization, as well as to drive the buffer.

Today most >$200 mikes (and some under) use DC-DC conversion...

What mics do this?
Apart from AKG there are only a few I know, the Josephson and Gefell MV225 both use measurement capsules as omnidirectional studio mics but are ~$2000.
All the other measurement mics need 200 V or use electrets and don't need any DC-DC conversion.
I assume there must be voice/studio mics that use DC-DC but I wouldn't have expected "most".
They still copy old Neumanns and haven't moved to electrets?
Maybe such a DC-DC mic could be adapted to drive a measurement capsule...hmm.

Best wishes
David
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Old 10th June 2021, 02:35 AM   #26
PRR is offline PRR  United States
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Phantom Power and Mic Capsule Voltage
> All the other measurement mics need 200 V

I thot we were talking P48 studio mikes? How did 200V system come in?

OK, I see your measurement mike thread. That's another world from P48. In studio you may have very long cables and you should not electrocute performers. In measurement, cables may be short (and unbalanced) and technicians should know better.

Last edited by PRR; 10th June 2021 at 02:38 AM.
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Old 10th June 2021, 08:33 AM   #27
Dave Zan is offline Dave Zan  Australia
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Quote:
Originally Posted by PRR View Post
..P48 studio mikes? How did 200V system come in?
These are P48 studio mics, they use DC-DC converters (to power the 200 V polarisation of the capsule), just as you said "most >$200 mikes" do.
Is this not exactly what you talked about?
My question is what other mics do this, the 200 V system is what I wish to avoid.

Best wishes
David
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Old 10th June 2021, 07:25 PM   #28
PRR is offline PRR  United States
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Phantom Power and Mic Capsule Voltage
I'm sure you know more than me about these things.
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