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Old Sunday, October 11th, 2009, 10:01 PM
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What's causing hum?

Camcorder is receiving an XLR input from soundboard. Audio is good until a composite output from camera to projectors is connected. This was a temporary set up but would be helpful to know a remedy to allow recording through the camera upon occasion. What might overcome the hum?
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Old Sunday, October 11th, 2009, 11:48 PM
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Is your camcorder running off ac power or the batteries?
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Old Sunday, October 11th, 2009, 11:58 PM
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Sounds like a ground loop between audio power and video power. The solution is either isolation transformers in the audio line or a humbucker in the video line. Audio transformers are the less expensive solution.
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Old Monday, October 12th, 2009, 01:23 AM
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Wayne's right. I would recommend the Radial twin iso audio transformer.
http://www.radialeng.com/di-twiniso.htm
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Old Monday, October 12th, 2009, 06:22 AM
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Camera was running on electricity. Audio/video had to be recorded separately because of the hum - but like I said, this is temporary & we hope to get approval for some live video production gear soon.
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