Re: Of Mice and HV (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 18 Apr 2006 08:17:40 -0700 (PDT)
From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Of Mice and HV (fwd)

Yeah. After all, they are "intelligently designed"
vermin!

Adam

--- High Voltage list <hvlist@xxxxxxxxxx> wrote:

> Original poster: Steven Roys <sroys@xxxxxxxxxx>
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Thu, 13 Apr 2006 20:02:05 +0200
> From: Finn Hammer <f-h@xxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Of Mice and HV (fwd)
> 
> Great idea!
> 
> I think animals will be able to sense the E-field
> from charged plates 
> far away, so they will be reluctant to enter between
> them.
> 
> You probably have to build  some sort of  sensor to
> verify that the 
> mouse is lined up between the electrodes. When it is
> in position, squirt 
> liquid conductor on the critter, and gate SCR.
> 
> Cheers, Finn Hammer
> 
> High Voltage list wrote:
> 
> >Original poster: Steven Roys <sroys@xxxxxxxxxx>
> >
> >
> >
> >---------- Forwarded message ----------
> >Date: Tue, 11 Apr 2006 07:20:03 +0930
> >From: Matthew Smith <matt@xxxxxxxxxx>
> >To: High Voltage list <hvlist@xxxxxxxxxx>
> >Subject: Of Mice and HV
> >
> >Greetings All
> >
> >CONTENT WARNING: If you are distressed by nasty
> things happening to
> >vermin (small furry creatures to those not infested
> with them), please
> >do not read any further.
> >
> >They don't make 'em like they used to!  Our house,
> completed just over
> >two years ago (actually not completed, but that's
> another story!)
> >appears to have been built to accommodate rodents
> just as comfortably as
> >humans.
> >
> >Snap traps have proved anything but reliable (bait
> gone, trap still set)
> >and when they do operate, frequently kill in an
> unclean manner.
> >
> >So, I have decided to build an electric mousetrap. 
> Idea is simple:
> >mouse enters trap and has to pass through a narrow
> gap between two
> >aluminium plates arranged in a V.  (Mouse enters
> the larger part of the
> >V.)  One plate is fixed, the other against light
> spring tension so that
> >the subject has to push between the two plates to
> get to the bait.
> >
> >Plates are connected to a charged capacitor. 
> Charging will be from a
> >PWM supply driven by a microcontroller which stops
> when capacitor
> >voltage reaches an upper threshold and starts again
> once it has
> >discharged (mostly through the feedback voltage
> divider) down to a
> >minimum voltage.  The idea being that this device
> is battery-operated
> >and tries to save power.
> >
> >Does anyone have any idea what minimum voltage I
> would need to apply to
> >guarantee fatal fibrillation?
> >
> >I had considered powering from a disposable camera
> supply (no
> >microcontroller - simply pulse the start button
> when the neon goes out)
> >but, whilst photoflash capacitors can give us a
> ghastly bite, is the
> >300V or so enough to take out a mouse in its
> insulating fur coat?  I've
> >serviced equipment before where mice have gone in a
> mains (240V) PSU and
> >have blown the fuses but am still unsure about the
> certainty of a clean
> >kill.
> >
> >Once I've got this idea working, I want to motorise
> it so that the
> >defunct rodent can be cleared from the plates and
> the trap be readied
> >for another "client".
> >
> >Cheers
> >
> >M
> >
> >  
> >
> 
> 
> 
> 
> 


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