> VCO? PIC & PWM?

Alessandro, AFAIK no electronic repellent works. They're one of
those quack devices that have been around for years, based on
unsubstantiated science with enthusiastic, glowing testimonials (from
friends, family members and shareholders no doubt)
 
Mosquito buzzers' worth queried

http://news.bbc.co.uk/2/hi/health/4218234.stm

Scientists find natural mosquito repellent (interestingly uses the
same mosquito picture. I didn't know mosquitos had agents)

http://www.msnbc.msn.com/id/6847440/

http://en.wikipedia.org/wiki/Insect_repellent

"For protection against mosquitos, the U.S. Centers for Disease Control
recommend DEET, icaridin, or oil of lemon eucalyptus for skin, and
permethrin for clothing, gear, or bed nets. Oil of lemon eucalyptus was
found to be more effective than other plant-based treatments, and had
similar effectiveness to low concentrations of DEET. Some of these
repellents are not recommended for use on younger children. Safety and
effectiveness concerns have been raised regarding the use of citronella.
It should not be used on children"

In a recent program by The Bug Man (Ruud Kleinepaste) in The Amazon
had him slapping on industrial-strength DEET, but he still got eaten alive

A former list member, Alice Campbell, reported some success whilst
camping by having a burning candle to generate CO2 that lured the
mosquitos away to some extent. Not a practical solution though for
an Alessandro on the go

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