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#184259 - 02/05/09 02:34 PM Electrified Fly Swatter  
Haligan  Offline
Member
Joined: Feb 2004
Posts: 111
Berkeley, CA USA
My father in law gave me one of these for Christmas a few years back. I wrote it off as a toy but it actually works. I found out how well it works when I accidentally touched my thumb against the rails. Holy Moses!!!! All of that from a 9v battery. And an old one at that.

So theory-wise I want to understand this better. It seems that a lot of the voltage is being traded for current somehow. And the rails must alternate pos and neg so your bug (or thumb) can complete the circuit.


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#184260 - 02/05/09 02:52 PM Re: Electrified Fly Swatter [Re: Haligan]  
EV607797  Offline
Member
Joined: Oct 2006
Posts: 745
Fredericksburg, VA, USA
That's pretty much how it works, like an ignition coil in a car; 12 volts in and a gazilion volts out. I got one about two years ago and got a lot of use out of it for my outdoor bar. Sadly, I dropped it and broke the handle part where the battery is held.

They do well for small insects, but don't work especially well with wasps for some reason. Let me tell you, they are NOT happy after getting a taste of about 2KV. I've also found that moths tend to catch on fire and they stink!


---Ed---

"But the guy at Home Depot said it would work."

#184262 - 02/05/09 03:09 PM Re: Electrified Fly Swatter [Re: EV607797]  
Haligan  Offline
Member
Joined: Feb 2004
Posts: 111
Berkeley, CA USA
So there must a tiny little step up transformer built into the handle then.
I wonder what the output is. My meter doesn't go that high.


#184263 - 02/05/09 03:14 PM Re: Electrified Fly Swatter [Re: Haligan]  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,262
Fullerton, CA USA
Here's the answer to your question smile

http://home.howstuffworks.com/bug-zapper.htm


.


#184264 - 02/05/09 03:19 PM Re: Electrified Fly Swatter [Re: EV607797]  
SteveFehr  Offline
Member
Joined: Mar 2005
Posts: 1,213
Chesapeake, VA
It probably uses a small inverter and a Villard or Cockroft-Walton cascade to step that 9V up to over 1000V for the zap. And yeah, the grid would alternate +/-.


#184265 - 02/05/09 03:19 PM Re: Electrified Fly Swatter [Re: Haligan]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,142
Estero,Fl,usa
I assume it is a simple multivibrator circuit feeding a transformer. The collapsing field in the primary can generate some huge voltages on the secondary. I have seen simple tricks with a two winding relay, picked through a N/C point through the low impedance coil that will create a lot of voltage on the other coil. A nice but noisy "one part" zapper. You can put a capacitor across the points to protect them and increase the zap.


Greg Fretwell

#184266 - 02/05/09 03:50 PM Re: Electrified Fly Swatter [Re: gfretwell]  
EV607797  Offline
Member
Joined: Oct 2006
Posts: 745
Fredericksburg, VA, USA
Yep, I remember in elementary school when I got between the contacts of a simple DC buzzer. It's amazing how much voltage can be built up with a simple wire coil.


---Ed---

"But the guy at Home Depot said it would work."

#185188 - 03/05/09 02:59 PM Re: Electrified Fly Swatter [Re: EV607797]  
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
Taser technology at a safer voltage level.



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