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Converting line level to mic level

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Justin Toney
Converting line level to mic level
on Sep 19, 2012 at 4:06:29 pm

Hi,
I have a CANON XH-A1 camera which I am using for shooting football. I'm being sent a line level signal from the radio booth. At the same time, I also have a phantom powered crowd microphone that I am needing to use.

The XH-A1 only has 1 line/mic option and not separate options for each channel. I need something that will either convert that line level to a mic level (otherwise it is distorted) or something that can bring my phantom powered microphone to line level.

I'm open to purchase or creating such a contraption, but I would rather make it if I can.


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Eric Toline
Re: Converting line level to mic level
on Sep 19, 2012 at 6:36:33 pm

What you need is a 40db pad. It's available as an inline plug in. The ATT448 from Markertek.com is a 3 step unit with attenuation at 20/30/40db for $15.59. You can't build one that durable for that price.

Eric

"I push the RECORD button and hope for the best"


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Peter Groom
Re: Converting line level to mic level
on Sep 19, 2012 at 9:01:25 pm

Eric is right -40 db pad.
Peter

Post Production Dubbing Mixer


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Justin Toney
Re: Converting line level to mic level
on Sep 21, 2012 at 6:36:59 pm

Yea I got an adapter from B&H. Is there a diagram on how to build my own? I would like to make a few of these.



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Eric Toline
Re: Converting line level to mic level
on Sep 22, 2012 at 2:28:00 am

Here's a simple 20db pad diagram:


XLR-M pin 1............................XLR-F pin 1


XLR-M pin 2....(470 ohm resistor)......XLR-F pin 2


XLR-M pin 3....(470 ohm resistor)......XLR-F pin 3

A 100 ohm resistor between pins 2 & 3 will give you 20db of attenuation. For more attenuation lower the value of the 100 ohm resistor, a 50 ohm should be about right.

Eric

"I push the RECORD button and hope for the best"


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Jordan Wolf
Re: Converting line level to mic level
on Oct 18, 2012 at 5:15:17 pm

Make sure that the balanced feed you're being sent from the radio booth has its Pin 1 lifted, or the phantom power coming from your camera's inputs could fry the output circuitry in the mixer.

Wolf
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