What think ye of a DIY Narrow Bandwidth Transformer?

Posted by Christopher Witmer (A) on February 18, 2009 at 20:46:09

The 8th page of the PDF linked below shows a Narrow Bandwidth Transformer, where a bifilar-wound transformer has one of the two windings connected in reverse phase through a capacitor. To low frequencies, the capacitor appears to be an open circuit but to high frequencies it acts as a closed circuit, so that high frequencies flow through the capacitor-linked circuit; the phase inversion means that the noise is effectively canceled.

Wouldn't it be fairly easy to DIY a Narrow Bandwidth Transformer? There are plenty of bifilar wound transformers around, such as 120Vx2/120Vx2 isolation transformers. Alternately, perhaps two *identical* transformers could be wired together for similar effect.

Obviously there would be at least one inefficiency in taking the approach I'm suggesting here -- for example, the original current rating of the transformer would need to be halved. (Since transformers can be seriously overloaded for brief periods of time with no harm, perhaps a transformer manufacturer could find a way to design such a transformer with less than a 50% loss of current capacity relative to the core size.) But the inefficiency I just mentioned seems like a small price to pay if benefits similar to those described in the paper can be obtained.

To me this seems like such an obvious candidate for DIY knock-off that I expected to see something come up in a Google search on "DIY Narrow Bandwidth Transformer" but I couldn't find anything. I can't believe I'm the first DIY fan to think of knocking off this idea, so the fact that my search turned up nothing could mean I'm overlooking some really major obstacle to accomplishing it. But then again, maybe not. So . . . what do y'all think?

Transformer Based Solutions to Power Quality Problems (Open in New Window)

This post is made possible by the generous support of people like you and our sponsors:

Topic - What think ye of a DIY Narrow Bandwidth Transformer? - Christopher Witmer 20:46:09 02/18/09 (1)

Thanks for posting this. - Al Sekela 11:37:42 02/20/09 (0)

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.