[CQ-Contest] removing FD residue

[Zack Widup]

On the Microchip PIC microcontroller application notes website is an idea
for a novel mosquito repeller. It simply produces a very quiet duplication
of the sound of a dragonfly's wings.  The dragonfly is a natural predator
of the mosquito, and the theory is that the mosquitos will actually try to
avoid areas where they hear dragonflies flying.  

I built one using a PIC12C508 and a small piezoelectric transducer.
Surprised me - the darned thing actually works! 

73, Zack W9SZ

On Tue, 23 Jul 2002, K4SB wrote:

> jljarvis wrote:
> > 
> > Guys,
> snipped
> > For those of you who doubt the insect chasing properties of this stuff...don't.
> > a 50% sol'n w/water works well as a spray.  We use it in VT against black flies and
> > mosquitos, and in the Carribean for mustiques & no see 'ums.   Works great.
> > 
> > 73, Jim, n2ea
> 
> Don't know if this product contains it, but NBC ( I think ) ran a news
> item a week or so ago, and it showed the results of testing. In short,
> if the product doesn't contain an ingredient called "beet" (spelling
> is probably wrong ), it's worthless as a repellent.
> 
> 73
> Ed