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Old 11th May 2005, 11:31 AM   #1
Biffa is offline Biffa  United Kingdom
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Default 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


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Old 12th May 2005, 08:16 AM   #2
moamps is offline moamps  Croatia
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What type microphone and input connector is used?
(stereo input thru 3.5 jack or mono-balanced thru XLRF)
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Old 13th May 2005, 01:02 PM   #3
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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.
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Old 19th May 2005, 02:15 PM   #4
Biffa is offline Biffa  United Kingdom
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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


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Old 19th May 2005, 02:22 PM   #5
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10uF is pretty common in this application.
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Old 19th May 2005, 03:31 PM   #6
moamps is offline moamps  Croatia
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