[sdiy] [OT] first steps with audio transformers

[Harry Bissell]

You can connect windings in series if you like... (or parallel but you probably don't want to do that...)

Low DC resistance should not be an issue, you need to keep DC out of a transformer anyway.

Probably you want to have some opamp buffer to drive the transformer. You'll need to keep signal
levels pretty low to avoid saturation at low frequencies (approaching DC, which is bad...).  That's
why the distortion chart takes such a steep curve up at the low end...

Try http://www.jensen-transformers.com/ for some good reading

H^) harry


----- Original Message -----
From: Michael Zacherl. <sdiy-mz01 at blauwurf.info>
To: sdiy DIY <synth-diy at dropmix.xs4all.nl>
Sent: Wed, 24 Nov 2010 07:44:25 -0500 (EST)
Subject: [sdiy] [OT] first steps with audio transformers

Hello,

    I'm about to do my first steps with audio transformers and the more I read the more I  become uncertain about many points. :-(

First application will be an analogue input/output and monitoring stage for some laptops (different brands) in order to interface with a synth and/or mixer.

Admittedly I'm not sure about impedance, dc-resistance and if it's feasible to connect windings.

Looking at a data sheet overview like this 
http://docs-europe.origin.electrocomponents.com/webdocs/008d/0900766b8008d64a.pdf

I find this one pretty attractive (also moneywise)
http://docs-europe.electrocomponents.com/webdocs/00bb/0900766b800bbc2c.pdf

How to handle this low dc-resistance?
Could I connect the primary windings?
Input impedance appears to be pretty low as well, bad?

Thanks a lot, Michael. 

--
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Harry Bissell & Nora Abdullah 4eva