phantom power 48 volts

[walters]

What can cause noises in a phantom power unit ?


phantom power is really a 48 volt preamp right?

plus it supplies 48 volts DC on the coil in the mic?


Whats the DC offset for a phantom power unit?

[sdelsolray]

He's DJL's cousin, I think.

[Harvey Gerst]

Originally Posted by walters

1. What can cause noises in a phantom power unit ?

2. phantom power is really a 48 volt preamp right?

3. plus it supplies 48 volts DC on the coil in the mic?

4. Whats the DC offset for a phantom power unit?

1. Noises are the mic signal going thru the power unit. It's normal.

2. No, it's really a 48 volt power supply.

3. If your mic has a coil in it, yes, it will supply 48 volts DC to it.

4. Exactly 48 Volts DC offset, +/- 4 Volts.

[Theros]

mwuhaha, harvey put that one to rest real quick... Walters must be getting tired...

[crazydoc]

Originally Posted by walters

What can cause noises in a phantom power unit ?

The phantom...

[mr.rich]

i had a prob with a soundcraft 1600 a while back. i kept getting some ugly buzz while tracking. i narrowed it down to condensers and promptly took in the power supply in for a checkup. turns out there was somthing up with the power supply and a resistor somewhere. 25$ later my condensers sounded clean. was odd.

[walters]

4. Exactly 48 Volts DC offset, +/- 4 Volts.

isn't that alot of DC offset 48 volts that seems like alot to me for
AC signal to be riding on ?

[wilkee]

Originally Posted by walters

4. Exactly 48 Volts DC offset, +/- 4 Volts.

isn't that alot of DC offset 48 volts that seems like alot to me for
AC signal to be riding on ?

There is no DC offset the voltage supplied to Pins 2 & 3 is from the same supply and is at approx +48v Ref Pin 1.

This is why it does no damage to balanced dynamic mics as each end of the voice coil is at the same potential therefore DC current will not flow thru the coil

Tony

[mattamatta]

Originally Posted by crazydoc

The phantom...

hahahahahaha

[snow lizard]

Originally Posted by wilkee

There is no DC offset the voltage supplied to Pins 2 & 3 is from the same supply and is at approx +48v Ref Pin 1.

This is why it does no damage to balanced dynamic mics as each end of the voice coil is at the same potential therefore DC current will not flow thru the coil

Tony

I've heard that if a dynamic is miswired and voltage does reach the coil, that a worst case scenario would be a melted voice coil and an effectively useless mic. (That pin 1 thing.)

Also, I'm not quite sure, but I think Walters is talking about waveform DC offset as experienced by cheap soundcards, which naturally has absolutely nothing to do with mics, and/or phantom power. The correct answer in this case would indeed be, "The Phantom". YMMV.

Walters my friend, are you or are you not indeed the fantastic new superhero of the current economic slump? If so, whatever happened to Studebaker Hoch, and/or are you him?


Impressed,

sl

[xstatic]

If proper phantom power damages a nic, please don't blame the poor phantom power supply. Blame either the user or the cable

[wilkee]

Also most phantom power supplies are only capable of supplying 150-200ma max hardly enough to go welding with. Might just about give yer testie's a good tingle.

Tony

[Blue Bear Sound]

Originally Posted by wilkee

Also most phantom power supplies are only capable of supplying 150-200ma max hardly enough to go welding with. Might just about give yer testie's a good tingle.

Skippy could probably use a good tingle.....

[giraffe]

c'mon walters, can you at-least stick to poluteing only the recording forum?
please?

[Micsales]

Originally Posted by walters

What can cause noises in a phantom power unit ?


phantom power is really a 48 volt preamp right?

plus it supplies 48 volts DC on the coil in the mic?


Whats the DC offset for a phantom power unit?

Hi! Micsales here!

Mr. Walters (I can call you Mr., right?)

You are a breath of fresh air in a steaming festering pool of the unknowledgable. Your question is a good one and one worthy of my valuable time and expertise.

Now, +48 volts is term bandied about here on this BBS and one that I feel is the most misunderstood thing out there. Mics do not "use" +48 volts for anything at all. There is an offset, but that offset is there so that the spec sheets can have data in that field. No manufacturer wants his/her mics to look bad. They want all the same functions and "specs" as their competition. Phantom power is one such spec. The "phantom power' name is a bad one because the +48v is *not seen by the mic*!

Think about this walters! A dynamic mic -does not see- this power at all!


So, this "+48v" power is obviously not used for anything at all. It is merely there for show and so that the mic builders can fill out there "spec sheets"

Believe it, but the +48v phantom power comes from the -mixing board- and -not- the mic!

Absurd, no?

Now, the offset question seems a little silly. right?

Hope you keep at the good questions as they all need to be answered by qualified, professional experienced people.

[snow lizard]

Originally Posted by wilkee

Also most phantom power supplies are only capable of supplying 150-200ma max hardly enough to go welding with. Might just about give yer testie's a good tingle.

Tony

How much current do you need to weld something that's 0.0001" thick?


sl

[crazydoc]

Phantom power will supply a maximum of 48V/6800 Ohms = 7ma for each leg, a total of 14ma to the device, as the specification calls for a 6.8k resistor in series with the voltage output to each pin (2 and 3).

[walters]

Believe it, but the +48v phantom power comes from the -mixing board- and -not- the mic!


Yea i know but you have to supply 48volts to the mic to give it power

What does phantom power do to the mic?

What is phantom power really?

[Blue Bear Sound]

Originally Posted by walters

Yea i know but you have to supply 48volts to the mic to give it power

What does phantom power do to the mic?

What is phantom power really?

Each of those questions has already been answered right in this thread.... READ THE FUCKING ANSWERS, SKIPPY...................

[Micsales]

Originally Posted by walters

Believe it, but the +48v phantom power comes from the -mixing board- and -not- the mic!


Yea i know but you have to supply 48volts to the mic to give it power

What does phantom power do to the mic?

What is phantom power really?

Hi! Micsales here!

I see you have a continuing dilemma that maybe I can answer since Mr. Blue Bear (I can call you Mr., right?) will not or -cannot- provide you with a logical well thought out conclusion.

Anyway, read and learn:

Main Entry: 1phan·tom
Pronunciation: 'fan-t&m
Function: noun
Etymology: Middle English fantosme, fantome, from Middle French fantosme, modification of Latin phantasma
1 a : something (as a specter) apparent to sense but with no substantial existence : APPARITION b : something elusive or visionary : WILL-O'-the-wisp c : an object of continual dread or abhorrence : BUGBEAR <the phantom of disease and want>
2 : something existing in appearance only
3 : a representation of something abstract, ideal, or incorporeal <she was a phantom of delight -- William Wordsworth>
- phan·tom·like /-"lIk/ adverb or adjective


This means that "phantom power" does not exist. It is only there to make recording engineers and soundmen/women seem more important that they really are. If the laymen/women understood this then the engineers would no be able to soak the poor artist of his/her hard earned money.

After all, who wants to screw around with a mic cable/mic if they think that they will be potentially shocked and killed with +48v phantom power?

Do you?

It is good that you are intelligent enough to ask the hard questions as I have taken an oath to tell the home recording community the truth as I see it.

[xstatic]

Originally Posted by xstatic

If proper phantom power damages a nic, please don't blame the poor phantom power supply. Blame either the user or the cable

Now this is just wonderful. I received negative feedback on this post by someone who doesn't have the balls to claim it

out of curiosity.....what is wrong with this post? It's the truth. If "PROPER" phantom power is involved with damaging something, than it wasn't the phantom power that truly did it, but some other error.

[acorec]

Originally Posted by xstatic

If proper phantom power damages a nic, please don't blame the poor phantom power supply. Blame either the user or the cable

Pretty much sums it up. Phantom power can only hurt you if you:
1. Plug in ANY mic with the phantom power ON
2. Have a cable that is mis-wired or with a shorted conductor.


you got it exactly right.
BTW: Walters gave my some bad rep also in the mix thread. He does that for fun. Just ignore the rep system in general.

[xstatic]

I actually find it fairly amusing. Its just funny that posts that are actually right and really non offensive gets me a negative rep. Then there are times where i borderline lose my cool. I re-read my own post after its too late and think I should actually give myself a negative rep point

[snow lizard]

What's kind of funny is that I actually gave walters a positive rep point in this thread, and then I get a negative one...

Oh well. Last time I try to help walters, I guess.


sl

[crazydoc]

Originally Posted by crazydoc

The phantom...

Yeah, I got a red chicklet for this one, but it's not walters. He has no rep power so he can't give rep (head maybe, but not rep.)

Anyway, it's somebody else - just some anonymous chickenshit.