Small audio transformers?

[Rich_S]

I'm thinking about a couple projects requiring small audio transformers. One would be a splitter to drive two guitar amps (maybe with a Fat Pants as the front-end.), with two transformers providing isolation against ground loops.

The other would a passive direct box, built into a small pedalboard for my acoustic. This one would need to provide the impedance match to a Lo-Z PA mixer as well as isolation.

Anyone have any recommended models & vendors for such things?

[stecykmi]

by coincidence, I was recently looking at audio transformers myself and came upon these two companies that may be what you need. they seem to be around the $15-20/each price point:

http://www.tamuracorp.com/products/audio-transformers/
http://www.triadmagnetics.com/catalog_template.php?productCategoryId=48

I'm not really qualified to help you choose the right one unfortunately, but these are "audio quality" transformers, supposedly.

[oldhousescott]

Ted Weber has a cheapie balun xformer for $4, but it only goes down to 80Hz. You might rather look at the WSM line at EdcorUSA. They have full-range audio-grade stuff for fairly cheap. If you want to go full-tweak, look to Jensen or Sowter or Cinemag.

[Rich_S]

Can anybody confirm what impedance ratios are good for my purposes?  I'm guessing 10K/10K for guitar splitter/isolator duty, and 10K/600 for a direct box.  Ja?

[oldhousescott]

Sounds about right. There are some great application notes on the Jensen site, well worth your time to peruse them.