I read in sci.electronics.design that David Lesher wrote (in ) about 'Constant Voltage Transformer Question', on Fri, 28 Jan 2005:
UL approval for what? There is no product safety issue. There IS an EMC issue, but the US has not adopted IEC/EN 61000-3-3, which would probably have caught the problem.
It turns out, at least in the last one I took apart, it _looks_ like a ferro, but that oil-filled cap is merely the filter cap in a half-wave doubler. The tranny looks like a ferro, because the primary and secondary are separate windings, with a space between them. But there are no shunts, and no resonant winding. )-;
It's a linear transformer, and the cap is only a HV oil-filled cap.
How mundane. ;-)
The maggie _is_, however, the other diode in the half-wave doubler. ;-)
Cheers! Rich
There are shunts (or some sort of welding trick), so that the transformer current limits. It's like a Neon sign transformer.
Mark Zenier snipped-for-privacy@eskimo.com Washington State resident
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