XLR unbalancing transformer

[toothpastefordinner]

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.

[strdsk]

Places like Mouser, Digikey, and Parts Express all sell cheap and small trannies for stuff like this.

[Scodiddly]

What's the exact application - mics or line level? Mic-level transformers are much easier than ones that can handle line level.

-Scott

[toothpastefordinner]

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!

[Scodiddly]

You might find it easier to call up ProCo and also Whirlwind, and tell them what you need.

[ubertar]

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.

[themagicmanmdt]

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.

[Peterson Goodwyn]

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.