Recording Techniques, People Skills, Gear, Recording Spaces, Computers, and DIY
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toothpastefordinner
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by toothpastefordinner » Thu Sep 01, 2011 8:18 am
I'm working on a relatively simple project for a friend to take some XLR inputs and use a transformer to unbalance them gracefully. My normal approach of leaving one of the signal pins floating/grounded is not going to work here, sadly, due to noise/hum problems.
What transformer would you suggest? I'm looking for a "good enough" kind that's not going to cost $40 a pop or something. I know where to get the nice ones but I'm stumped as far as finding 16 just-okay transformers at a decent price.
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strdsk
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by strdsk » Thu Sep 01, 2011 11:45 am
Places like Mouser, Digikey, and Parts Express all sell cheap and small trannies for stuff like this.
Working on music with Pete from Porno for Pyros...
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Scodiddly
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by Scodiddly » Thu Sep 01, 2011 12:09 pm
What's the exact application - mics or line level? Mic-level transformers are much easier than ones that can handle line level.
-Scott
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toothpastefordinner
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by toothpastefordinner » Thu Sep 01, 2011 12:18 pm
Scodiddly - Mic-level, we're looking at -50dB tops, if that.
Strdsk - Mouser has thousands of transformers, I actually dug around in their catalog for a long time before posting... Dunno which to use that would be OK for what I need!
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Scodiddly
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by Scodiddly » Thu Sep 01, 2011 12:34 pm
You might find it easier to call up ProCo and also Whirlwind, and tell them what you need.
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ubertar
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by ubertar » Thu Sep 01, 2011 12:58 pm
Are you looking to change the impedance, or keep it the same? If you want impedance matching transformers like those in a DI box, PM me, I have plenty.
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themagicmanmdt
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by themagicmanmdt » Thu Sep 01, 2011 1:50 pm
http://www.edcorusa.com/products/140-wsm150-150.aspx
there's your xfmr.
150 ohms to 150 ohms, so it's just a matching transformer for mic matching impedance.
one side hook up as balanced, the other side just use the (-) side as ground, and voila, unbalanced!
keep mindful about phantom power blocking issues...if that's an issue.
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Peterson Goodwyn
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by Peterson Goodwyn » Fri Sep 02, 2011 6:57 am
Boom goes the dynamite. I was going to recommend Edcor as well. Mouser does have thousands of transformers but almost none of them are designed to pass 20hz-20khz gracefully.
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