NEED SCHEMATIC FOR WIRING PHANTOM POWER

larrykane · 3rd April 2008

Hi
Just bought a nice lambda 48 VDC/ 1A regulated supply and want to make a phantom power supply, most likely a floor box with 4 in 4 out xlrs (or maybe just 2). I know my way around a soldering gun but am not a circuit geek (and I mean that in the most complimentary sense of the word).
I need a schematic and clarification about balancing diodes etc., and any info about double or quadruple "gang" units like this (is crosstalk an issue?)Can anyone help or post a link? Thanks

Phil Cibley · 3rd April 2008

Quote:

Originally Posted by larrykane

Hi
Just bought a nice lambda 48 VDC/ 1A regulated supply and want to make a phantom power supply, most likely a floor box with 4 in 4 out xlrs (or maybe just 2). I know my way around a soldering gun but am not a circuit geek (and I mean that in the most complimentary sense of the word).
I need a schematic and clarification about balancing diodes etc., and any info about double or quadruple "gang" units like this (is crosstalk an issue?)Can anyone help or post a link? Thanks

Send the +48V to pins 2 and 3 through a 6.8K resistor for each pin. Ground goes
to pin 1.

larrykane · 3rd April 2008

Thanks if I do a multiple unit can do paralell wiring from the same power supply (with resistors at each mic instance of course)?

Phil Cibley · 3rd April 2008

Quote:

Originally Posted by larrykane

Thanks if I do a multiple unit can do paralell wiring from the same power supply (with resistors at each mic instance of course)?

That's how they do it in consoles.

larrykane · 3rd April 2008

Thanks Phil

Phil Cibley · 3rd April 2008

BTW, make sure the resistors are 1% or better.

Minion · 3rd April 2008

Remember you Might also need DC Blocking caps so the +48v doesn"t get to the inputs of the preamp...

If your preamps use Input Transformers then you really don"t need to worry about it ,Your pramps might also allready have DC Blocking caps but also might not so it would be good to check and then add them to the Phantom supply if you need to....I generally use 47uF to 100uF values....

Cheers

DeeDrive · 6th April 2008

If there's an input trannie, you don't need blocking caps (transformers block DC), so they're probably aren't any.

JohnRoberts · 8th April 2008

Use 1% resistors (6.81k) for better Common mode rejection.

JR

larrykane · 8th April 2008

WANTED TO THANK ALL WHO CONTRIBUTED TO THIS THREAD AND OFFERED WIRING TIPS.
HERE IS A PICTURE OF MY STUDIO IN ACTION AFTER I TESTED THE PHANTOM POWER UNIT

larrykane · 8th April 2008

JUST KIDDING ABOUT THAT..
It works very well.

A2D · 11th April 2008

Quote:

Originally Posted by larrykane

WANTED TO THANK ALL WHO CONTRIBUTED TO THIS THREAD
HERE IS A PICTURE OF MY STUDIO IN ACTION AFTER I TESTED THE PHANTOM POWER UNIT

Now thats Funny

3rd April 2008	#1
larrykane Lives for gear Joined: Feb 2008 Location: Cleveland, Ohio Posts: 547 Thread Starter	NEED SCHEMATIC FOR WIRING PHANTOM POWER Hi Just bought a nice lambda 48 VDC/ 1A regulated supply and want to make a phantom power supply, most likely a floor box with 4 in 4 out xlrs (or maybe just 2). I know my way around a soldering gun but am not a circuit geek (and I mean that in the most complimentary sense of the word). I need a schematic and clarification about balancing diodes etc., and any info about double or quadruple "gang" units like this (is crosstalk an issue?)Can anyone help or post a link? Thanks __________________ other than that, how did you like the play, Mrs. Lincoln?

6th April 2008	#8
DeeDrive Lives for gear Joined: May 2005 Location: Hillsboro, OR Posts: 986	If there's an input trannie, you don't need blocking caps (transformers block DC), so they're probably aren't any. __________________ "When life gives you lemons, just say f@*k the lemons and bail" http://www.myspace.com/mattdistad http://www.myspace.com/froghollowdaycamp

8th April 2008	#10
larrykane Lives for gear Joined: Feb 2008 Location: Cleveland, Ohio Posts: 547 Thread Starter	WANTED TO THANK ALL WHO CONTRIBUTED TO THIS THREAD AND OFFERED WIRING TIPS. HERE IS A PICTURE OF MY STUDIO IN ACTION AFTER I TESTED THE PHANTOM POWER UNIT Attached Images

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread starter	Forum	Replies	Last Post
Phantom Power	Fishmed	Geekslutz forum	7	12th January 2008 08:32 AM
Buying a Phantom power to T power adapter on ebay	rackdude	So much gear, so little time!	0	12th December 2007 03:18 AM
PHANTOM POWER???	k.g.	So much gear, so little time!	3	26th November 2007 12:18 AM
Is External Phantom power better than In-The-Pre-Power?	Amplove	So much gear, so little time!	8	17th September 2005 06:06 AM
Is External Phantom power better than In-The-Pre-Power?	Amplove	Geekslutz forum	1	16th September 2005 01:30 AM

3rd April 2008	#6
Phil Cibley Lives for gear Joined: Oct 2002 Location: New York, NY Posts: 748	BTW, make sure the resistors are 1% or better.

3rd April 2008	#7
Minion Gear addict Joined: May 2006 Location: Vancouver Island Posts: 367	Remember you Might also need DC Blocking caps so the +48v doesn"t get to the inputs of the preamp... If your preamps use Input Transformers then you really don"t need to worry about it ,Your pramps might also allready have DC Blocking caps but also might not so it would be good to check and then add them to the Phantom supply if you need to....I generally use 47uF to 100uF values.... Cheers

8th April 2008	#9
JohnRoberts Lives for gear Joined: Nov 2006 Location: Hickory, MS Posts: 2,047	Use 1% resistors (6.81k) for better Common mode rejection. JR