Electronics > Projects, Designs, and Technical Stuff
Bug zapper "tennis racket"
themadhippy:
Dont be tempted to upgrade your bug zappers to a 63A 3 phase input
Red Squirrel:
Haha nice, I have one of those and always tell myself I want to mod it to take 18650s and just never got around to it. Easiest is to just wire it direct, but I would want some kind of low voltage cut off or at least an indicator, which makes things a little more involved.
Then there's simply completely replacing the electronics with something a little more beefy, like a push pull circuit and nice step up transformer. >:D
MarkMLl:
--- Quote from: Johnboy on July 23, 2020, 07:00:07 pm ---As a child on family vacations in the bush, my cousins and I applied flyswatters with gusto so that our family could picnick in peace without flies setting up shop on every plate and brazenly planting their flag in the potato salad. It was futile. No matter how many we killed, there were always more to take their place at the table.
--- End quote ---
I've heard of an initiative in Africa that was able to significantly reduce the number of (I think) tzetse in a locality by using low-tech traps. This was in the 70s IIRC, so probably predated zappers (and definitely predated solar panels to drive them).
--- Quote ---How could one use a fly as a NCV test subject? There used to be electric "Bug zappers" in people's backyards in the 1980's in the US... These often sported purple "UV" bulbs to attract insects. I don't recall them killing houseflies by the thousands, so could it be possible that flies (and some other insects) know to give them a wide berth?
--- End quote ---
The professional ones definitely work. My understanding from a former colleague is that Coca-Cola, who deal with an obscene amount of sugar, have particularly aggressive ones.
I think it boils down to the type of tube. The domestic toys that I've seen have some sort of phosphor, I suspect that the decent ones have naked tubes with a gas mixture tuned for a particular spectrum attractive to flying insects. There might be an LED with equivalent effect, but I'd imagine that UV LEDs- particularly the shorter wavelength ones- are currently in high demand due to attempts at sterilization.
MarkMLl
Zero999:
--- Quote from: MarkMLl on July 24, 2020, 07:25:55 am ---
--- Quote from: Johnboy on July 23, 2020, 07:00:07 pm ---As a child on family vacations in the bush, my cousins and I applied flyswatters with gusto so that our family could picnick in peace without flies setting up shop on every plate and brazenly planting their flag in the potato salad. It was futile. No matter how many we killed, there were always more to take their place at the table.
--- End quote ---
I've heard of an initiative in Africa that was able to significantly reduce the number of (I think) tzetse in a locality by using low-tech traps. This was in the 70s IIRC, so probably predated zappers (and definitely predated solar panels to drive them).
--- Quote ---How could one use a fly as a NCV test subject? There used to be electric "Bug zappers" in people's backyards in the 1980's in the US... These often sported purple "UV" bulbs to attract insects. I don't recall them killing houseflies by the thousands, so could it be possible that flies (and some other insects) know to give them a wide berth?
--- End quote ---
The professional ones definitely work. My understanding from a former colleague is that Coca-Cola, who deal with an obscene amount of sugar, have particularly aggressive ones.
I think it boils down to the type of tube. The domestic toys that I've seen have some sort of phosphor, I suspect that the decent ones have naked tubes with a gas mixture tuned for a particular spectrum attractive to flying insects. There might be an LED with equivalent effect, but I'd imagine that UV LEDs- particularly the shorter wavelength ones- are currently in high demand due to attempts at sterilization.
MarkMLl
--- End quote ---
UV attracts insects, but I don't think it's good for the type that bite.
You want longer wavelength near-UV LEDs, not the sterilising kind, which are no good as insect attractants. Incidentally LEDs are low efficiency emitters of short wavelengh UV, thus are only used in niche applications, where glass and mercury are a hazard. Mercury lamps are much better for most applications. On the other hand, near-UV LEDs are now more efficient than fluorescent tubes, so are ideal for blacklight and insect killers.
MarkMLl:
--- Quote from: blueskull on July 24, 2020, 08:00:06 am ---
--- Quote from: MarkMLl on July 22, 2020, 02:40:39 pm ---An 18650 will just about fit, and the board has an 8050SS on it which looks like it's rated for 5V.
--- End quote ---
The rating of the power device has little to do with the rating of a converter. It all depends on operating condition and much more.
No, they are likely not to explode at 4.2V, but they will have shortened life (who cares for something only being used for a few seconds at a time) theoretically.
--- End quote ---
But should still be adequate once the internal resistance of the crappy "5800mAh" cells I've got lying around is taken into account, plus the drop on the gnat's whiskers the manufacturer has used to wire up the LV end. If the device had been rated for say 3.5V I'd not have bothered.
The weakest link is going to be the pushbutton, which looks like it would be underspecced for a TTL signal. Curiously, the HV connections are in nicely braided and impregnated sleeving... somebody really ought to teach these Chinese a bit about industrial design.
MarkMLl
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version