Stripping Phantom Power

Biffa · 11th May 2005, 11:31 AM

Does anyone have a simple circuit to strip phantom power from an input. I have a mic level input on a camcorder that has non-switchable phantom power. Presumably some sort of DC blocking Caps arrangement would be required?

Many thanks

Biffa

moamps · 12th May 2005, 08:16 AM

What type microphone and input connector is used?
(stereo input thru 3.5 jack or mono-balanced thru XLRF)

loonatron · 13th May 2005, 01:02 PM

If it was a normal XLR type mic connector you could disconnect the 6.8k resistors that usually connect to pins 2 and 3 but as for camcorder mic power I have no idea.

Biffa · 19th May 2005, 02:15 PM

It's an XLR 3 pin female that delivers 48V in the normal way ( Distributed on pins 2+3 through 2 x 6K8 resistors so pins 1-2 read 48V as do 1-3). I need to plug a line signal, padded down 60 dB to mic level, into this input without getting power back to the line output. I figure Caps inline with each power leg would do the trick but I don't know values required.

Thanks

Biffa

pinkmouse · 19th May 2005, 02:22 PM

10uF is pretty common in this application.

moamps · 19th May 2005, 03:31 PM

..

11th May 2005, 11:31 AM	#1
Biffa diyAudio Member Join Date: Mar 2005 Location: London	Stripping Phantom Power Does anyone have a simple circuit to strip phantom power from an input. I have a mic level input on a camcorder that has non-switchable phantom power. Presumably some sort of DC blocking Caps arrangement would be required? Many thanks Biffa

19th May 2005, 02:22 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	10uF is pretty common in this application. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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12th May 2005, 08:16 AM	#2
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	What type microphone and input connector is used? (stereo input thru 3.5 jack or mono-balanced thru XLRF)

13th May 2005, 01:02 PM	#3
loonatron diyAudio Member Join Date: Dec 2003 Location: Sydney	If it was a normal XLR type mic connector you could disconnect the 6.8k resistors that usually connect to pins 2 and 3 but as for camcorder mic power I have no idea.

19th May 2005, 02:15 PM	#4
Biffa diyAudio Member Join Date: Mar 2005 Location: London	It's an XLR 3 pin female that delivers 48V in the normal way ( Distributed on pins 2+3 through 2 x 6K8 resistors so pins 1-2 read 48V as do 1-3). I need to plug a line signal, padded down 60 dB to mic level, into this input without getting power back to the line output. I figure Caps inline with each power leg would do the trick but I don't know values required. Thanks Biffa

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