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Kill a fly in mid-air?
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Nominal Animal:

--- Quote from: mengfei on August 31, 2023, 06:30:50 am ---^ what kind of Flies are those  :o
--- End quote ---
They're all blood-ingesting flies that bite (as opposed to e.g. mosquitoes which pierce skin with their proboscis):
* Lipoptena cervi, also known as deer ked or deer fly, are louse flies
* Hybomitra is a genus of horse flies, and belong to true flies
* Simuliidae, also known as black fly, are quite small pests counted as gnats or midges
* Ceratopogonidae, also known as no-see-ums and biting midges, are tiny; here, a millimeter or less in length – so smaller even than small fruit flies –, with their Finnish name, "polttiainen", referring to the burning feeling they cause when bitingIn Finnish, only houseflies (musca domestica) are called flies or "kärpänen"; the various types have all their own distinct names based on their behaviour ("hirvikärpänen", "paarma", "mäkäräinen", "polttiainen", respectively, for the four above).

Typical electric flyswatters intended for mosquitoes and houseflies tend to pass simuliidae through unless they've already eaten, and both ceratopogonidae and small fruitflies just aren't large enough to short the two electrode meshes at all, passing through no matter how slow or fast you swipe.

DEET works very well for mosquitoes, but simuliidae and especially ceratopogonidae in Finland require a higher concentration (50%) of DEET to be fully repelled, but it is over the legal concentration here.  I'm not certain about icaridin's effectiveness as a repellent for those.  Raid insecticide works well, but a transparent sticky tape near the bottom edge of window panes works really well too, and is much less toxic.  After moving 1Mm south decades ago, I now have zero immunity against the bites, and actually get a heavy allergic reaction which requires hydrocortizone cream to calm down.  (I've tried just about every other product sold in Finland too, because I either cannot sleep, or scratch the bites bloody while asleep, inflaming them badly; so do not bother suggesting any.  It is an immune system reaction, essentially an allergy, at this point.)
artag:

Marco:
I wonder how cheap erbium doped fiber pulse lasers can be made, it's not like you need ns level pulses. 10 kw for 10s of microseconds would probably be good enough.
BrokenYugo:

--- Quote from: Nominal Animal on August 30, 2023, 07:40:11 am ---Fruit flies and the smaller bloodsucking varieties are too small for the electric swatter to zap them.  They just pass through. >:(

--- End quote ---

Try adding a doubler? The crappy 630V film cap they usually use on the output tends to degrade fast anyway. 
Nominal Animal:

--- Quote from: BrokenYugo on August 31, 2023, 12:43:33 pm ---
--- Quote from: Nominal Animal on August 30, 2023, 07:40:11 am ---Fruit flies and the smaller bloodsucking varieties are too small for the electric swatter to zap them.  They just pass through. >:(

--- End quote ---

Try adding a doubler? The crappy 630V film cap they usually use on the output tends to degrade fast anyway.

--- End quote ---
The problem with that is the stink larger zapped flies will make: burned chitin smells awful.  Making a swatter with smaller spacing would work, though.

Fortunately, gnats and midges are not as keen on getting indoors as houseflies and mosquitoes, for some reason.
Also, fruit flies are easy to catch using a little bit of vinegar in a glass, covered by cling film perforated with a needle.
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