On Mon, 10 Feb 2014 00:11:40 -0800, Kevin McMurtrie
wrote:

In article ,
John Fields wrote:

begin 644 Hand calcs0003.pdf

LOL! Isn't that one of the early "150 in one" finger shocker circuits
that didn't work.

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Dunno, but I've gotten hit with HV off the secondary when a few
volts across the primary was disconnected.
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The transformer saturates before the relay engages.

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That depends on the transformer's primary's inductance, the
transformer's saturation current, and the relay's actuation time.
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If the 1.5V battery
can overcome the transformer's current, it turns into a little arc lamp
because the voltage rises too fast for the contacts to open.

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I don't understand.
If the contacts don't open where does the arc come from?
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There are a few working variations of the relay transformer driver.
It's how tubes were driven from batteries in the old days. (Hint: add a
capacitor)

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Actually, in the old days, B+ for the tubes was obtained from a
low-voltage battery (usually a 6 volt "A" battery) and a vibrator
driving the primary of a transformer.

Here's a beauty for your perusal:

http://www.tubebooks.org/Books/mallory_vibe.pdf

They were also used as synchronous rectifiers, so the rectifier tube
could be done away with:

http://www.radioremembered.org/vpwrsup.htm