On Fri, 8 Jun 2012 08:48:04 -0500, "HeyBub" wrote:

dgk wrote:
On Fri, 08 Jun 2012 08:19:04 -0400, Jim Elbrecht
wrote:

On Thu, 7 Jun 2012 16:40:27 -0700 (PDT), "hr(bob) "
wrote:

I thought I had seen almost everything electronic, but a Harbor
Freight ad in this weeks junk advertising flyer had a super coupon
for a

"7.99 electronic fly swatter on sale with the coupon for only $2.49,
requires two D batteries (old separately)".

It looks like an oversize tennis or badminton racquet. Not a clue if
the batteries are hooked up to a grid to electrocute any fly that
crosses paths with the swatter, or if you get a shock if you miss
the fly, or whatever.

Does anyone know what this thing actually is supposed to do
"electronically"?

Kill bugs! with a loud SNAP and a big spark! Where have you been,
man. They are more fun than the twitchin' tool.

That's a high price, though. I buy a couple every time I see them
for $4 at the 'dollar' stores or HF.

Warning-- If it doesn't seem like it is working, *DON'T* touch the
damn thing. That jolt is stronger than the buzz you get from a 110
line.

Jim

From two D cells? Well, I failed physics in the Rainbarrel thread, so
I'll try again. How can 2 D cells produce enough
voltage/amperage/whatever to shock a person?

Quite easily. The three volts is fed to an oscillator. The output of the
oscillator is fed to a 10,000:1 transformer. You end up with 30,000 volts
(give or take) across the transformer's secondary winding.

No need for the transformer, even. A switch (oscillator) into an inductor
will create a "flyback" voltage of pretty much anything you want. It's
generally easier to combine the two, though; A "flyback" switch/inductor with
a secondary step-up transformer. It's also known as an "ignition coil". ;-)

There's really no practical limit to the voltage output than can be had from
a 3 volt input.