Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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I'm a bit confused - "characteristic impedance"?

Posted by Christopher Witmer (A) on April 28, 2007 at 01:33:13

In Reply to: Yes. You will need to connect an R-C network to the secondary. posted by Al Sekela on April 27, 2007 at 22:05:03:

This is good news to me because I have access to scads of inexpensive surplus transformers used by Japan's "Pachinko" industry. These all go from 100VAC to 24VAC, in sizes ranging from 250VA up to 2kVA, and they are generally quiet. The larger sizes (over 1kVA), such as the one shown here, have bifilar wound secondaries, so they can also be connected as 48VAC if desired. Most of them lack electrostatic shields between the primary and secondary windings, but I assume that is a moot point for this kind of application.

One thing I am confused about is the reference to "characteristic impedance of Romex-type plastic wire" -- I thought impedance would depend on the length of the wire. Are you simply saying that 120 ohms is about average or typical? If so, I guess it is probably about the same in Japan as well, but it would be nice to get a bit more clarification on this.

And speaking of hum, what do you think of dipping a humming transformer into a can of varnish and then letting it dry? Or is there a better way to combat mechanical self-noise in a transformer?

Thanks!

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Kimber Kable

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