Chinese Insect Zapper (Mosquito Killer) - crazy circuit and burning resistors. 

cant stop laughing when I saw the sketch for the mouse. 😂😂😂

It kills mice by burning your house down! :-D

It is not insect killer, it killed itself before killing anything else.

Chinese mouse fly.

I like the way of showing problems. They will always criticize you. This is an invaluable help because you yourself will not notice the mistakes you make. Do not be angry with critics. Correct what you can. You have a big talent.

The review was conducted in a hilarious manner. I was laughing away at it was funny. Yes, the Chinese from China have very poor Command of English, so there's a lot of information that get lost in translation. At times, I do not understand what the product description and instruction is trying to put across. This reviewer made my day. The picture illustration was funny with the mouse part.

I hope you got a refund for these.

0:35 I ask every viewer to pause and read. It's hilarious! "No smelly cleanliness and HEATH!" 😂

I recently repaired one of my mosquito lamps and it had a very similar circuit. It had a real UV fluorescent tube though, not an LED. It seems like just what you said - they had a lamp designed for a tube and they put a low voltage LED 'tube' instead of the real high voltage tube. The LED tube is probably meant to run off a 12V AC transformer like used for low voltage halogen fixtures.

0:34 2. "Lure the insent"

If you just unsolder these two diodes and simply short circuit the 2 burned resistors, the ultraviolet LED may work. Then you can start zapping a few flying rats.

One way: The mice eat the live wires and get grilled. The other way: The mice eat the live wires and get poisoned to death by cheap chinese plastic even faster than the mains voltage would kill them.

I like how you explained the circuitry, I understood them and made me intrested even though I know nothing about electronics.

Did it state the voltage on the package, instructions or sale listing? I think that Chinese plug is actually North American! Same plug but 100V difference! Instead of that plug adapter, they should have sent a plug converter! I bet the math works better at 120V!

Love a product tear review/teardown that goes into the actual operation. The mouse diagram was a laugh bonus.

I can't even believe my eyes!

i just cant get the image of a mouse/rat flying through the sky to get to the zapper, is it possible they ment a bat LOL :-D :-D. Nice drawing he he :-D. And still they never use anyone that slightly understands english to write the box discription. How can they be so utterly bad in this day and age?

I've never heared funnier english accent

Thanks fella for showing the deadly garbage sold on the internet 👍

Love the mouse drawing, Brilliant ! 110 Volt plug put on 220/240V supply with the Chinesium adaptor. You Popped it. Great reverse engineering. Piece of dangerous plastic rubbish.

"Can use for long-term without break" Suuuure.

Haha.. I cant stop laugh.. you are funny.. Rat Can Fly..??

Man...you are too good.. I just kept on laughing watching how you are calculating staffs... I subscribed only for the way u presented the things and did the calculation and made the video in another level. Keep on...

These zappers are a fire hazard. The resistors burn within 1 hour. It is a voltage amplifier circuit that barely works. The LED circuit is being fed about 40 volts off the R2 resistor and that is why it gets so hot. I initially replaced the R2 resistors with 10 watt resistors and they still get super hot. I bought 2 of these and both burned R2 resistor almost immediately. I replaced the LED circuit with a 120v to 3.5 volt buck converter from ebay and the led's work great now. The grid side has never failed.

"The corners of the box are slightly compressed." - the most polite accusation of a delivery company.

You are the best! Thanks for your explanations.

It's a greater risk to the user than a mosquito. Great video, keep em coming.

That was a funiest reverse engenering ive seen. Thanks a lot. Rotfl!!! You make very interesting electronic videos! Keep going. God bless your family

I am slightly puzzled... How do you even turn the thing on when it is suspended from the ceiling?... Are you supposed to climb on a chair each time you want it on or off, since the switch is located on the top?... Nice touch! How clever! BTW, I think it shows everything it CANNOT kill on the package. You'll notice human beings are not represented... mmh. ;)

thank you for testing these products from countries with low safety standards.

Mouse are you kidding me?! Lmao at his reactions

Flying mouse omg... You made me laugh, thanks :DDD love the painting

I thought I got it cheap on eBay because they had an error in their production and many units were made with a 1/4 Watt resistor when really it should have been at least a 2 Watt. But as you are saying, it was probably meant for a florescent tube! I wanted to map out my schematic but didn't so far. Interesting that it works fine now when I replace the resistor with a 5 Watt. However it's still a mediocre unit because I also found out that the "kill power" of this thing is very low. While you do get a nice big spark if you short the grid, it hardly kills bugs that land on it. It's most effective in killing what looks like little moths, they are attracted to the light and just stick to the grid and don't burn up in any way. But I tried to kill some fruit flies, and had to trick them by putting the unit on top of a little container with fruit peels. So I found two on the grid. One of them was dead, and the other was alive basically jumping between the two wires, like saying hahaha, it can't kill me. So I took a matchstick and moved the fly so its body, not just wing, made contact with the two wires and then it started burning it with smoke emanating and it STUNK! I understand that the more "legit" bug zappers are strong enough to pretty much blow the bug apart as it hits the grid, and the bug gets partially burned and falls right off the grid to the bottom. Somehow this unit's HV circuit produces a few thousand volts but very little current, so it's not enough to really travel effectively through the bugs that end up on it. Either way I understand that in order to attract mosquitoes you need a source of carbon dioxide, and some movement. They are not attracted to UV light...

the burned resistor is 5.1k.

Well, Mr you won the Nobel prize in physics

1:29 sírijúsly

Czenglish ! :D ok bratu , subscribed :D

The capacitors actually only charge to the peak of mains voltage each. 400 volt capacitors will allow operation up to 283 volts AC safely. The capacitors closer to the mains handle more current, therefore, need to be larger values. All in all, the series capacitance needs to be appropriate for the desired discharge energy. It's nicely designed. The 5.1K resistor is too low a value. In a fault condition, like the grid wires shorting, or a bug bridging the grid wires, that resistor could dissipate as much as 11.3 watts!! it won't take much to smoke that! one can only hope that the capacitor values are low enough, to reduce the dissipation of that resistor in a fault condition. It almost looks like the voltage multiplier was designed for 240 V AC, and the light was designed for 120 V AC. Anyway, it looks like a passable design, but with the wrong resistor values.

After this video the product even gained new features: Child Killer, Fog machine and House burner.

The mouse dies because of the ozone made by the UV lamp.

I also guess the circuit was designed to use custom fluorescent tube, not LED.

Its not made for 240 volt i think

My first instinct when it failed was "designed for 120V or less"... which may be true, but I don't see how it would work properly at lower voltages either.

that desing of the mouse flying ... man i just pissed my self from laughing.... good one :)

Love engrish on packaging

By looking at the circuit before the 'Tube', I can't quite work out how that would power the tube without blowing. Apart from the burned resister (which I assume is an inrush current limiter), there's nothing limiting the current flowing through the two diodes for half the AC cycle through the tube. Even the 220nf capacity doesn't make sense. I reckon if this 220nf capacitor was inline like the top-left 47nf capacitor, the current would be limited enough to drive the UV 'Tube'. But if that was a real tube, the DC current would result in a very short life, like some battery operated fluorescent lights that ran the tube on DC.

why does it say '470' on the resistors? do the maths and notice that it is 0.245 A and consequently 56W (no insanity there)

Is it rated for 120 volts only maybe... Ain't it 240 volts where you're from?

Is there any rated voltage mentioned on the box? They put an adapter to box bot i dont think they thought about voltage values.

FULL BRIDGE RECTIFIAH

u sure this was meant to run on 220 and not 120? that may bring some of these components back into specs.

that mouse part killed me !! lol , I am laughing like stupid at 2:50am in the morning lol!!! hahahha thumbs up for that!

Mosquito Killer gone wild and killed itself.

Miluju ty hodiny v pozadí :D/ I love clocks in background :D

It kills the mouse by burning down the house!!!!!!!

OMG the bug zapper died just out of the BOX! Priceless! hahaha

They didnt lie about LED

If we neglect the 220nF capacitor and the two diodes in the lamp circuitry, the burned Non-47Ω resistor would have dissipated around 15 Watts. The value could be something like 3.3kΩ.

I have one of these which is physically identical but with different construction. If I recall correctly the light is in series with a dropper capacitor across the power input and the grid is a single stage multiplier. And this is for 120v. I might need to check it again because I don't think 340v is enough to zap insects.

If the 2 diodes before the light were cathode to cathode or were anode to anode you would get a significant voltage and current drop. So much of a drop it wouldn't matter if it was used in a 230v or 120v source. I can't tell by the video if the drawing and or silkscreen on the board was wrong, or if a diode was just put in backwards. This unit has none of the safety features required to be UL Approved and is probably available in the USA via the internet only. As with any product bought direct from the country of origin, buyer beware.

Lmao at the box instructions full of typos and lmao at the accent haha

only 110v ac input

Lol, the "kill" and "zap" part in the Ad was referring to the resistors. By the way, the 1500v will still be too low for most insects at that electrodes separation of the grid. The one I have uses 3600v (from a switching inverter) and that one works just fine. Unfortunately, does not kill mice either... Oh, and you are right about the doubler going to the light bulb. Originally, those units had a fluorescent UV-A bulb with a screw base just like that, but I guess that other Chinese seller scammed this Chinese seller into buying LED lamps that work "exactly" the same as replacements, lol

Hej man your videos are the best!

I think the schematic makes sense if only the polarity is respected, if not it is a gamble!

Oh my god thank you 😂😂😂😂 I was having a terrible day and now I can't stop laughing and the mouse schematic OMG

omg.iReallyLaughedWithTears.

can it kill a humanized mouse ??

Component crematorium. The components get zapped before any insect gets near it. Je je.

Very nice vid.

I like how the latest one is better and worse at the same time

So many strange circuit in chinese products. I had an emergency lamp that burned when it was charging. The resistor to red LED indicator was burned and the elco from bridge rectifier was blowed into pieces. The elco only 50v, and the resistor power clasification is only 1/4 watt with a mysterious value too. It's clearly a 800mA current is running on the circuit. The main light contains 40pcs smd LED 3.2v in a paralel. And because of two component were blowed, the rotary resistancy switch and the transistor are become broken. I analyzed that they use negative path to controlling the transistor. The other emergency lamp has a solar panel which using negative path through the switch. And amazingly the solar panel is directly connected to 3pcs paralel 3.7v li-on battery. The circuit board was burned included all component on it. I tested the solar panel's voltage output and it could reach 15volt under the light of lamp. Buahaha...

Dude I love you so much.

@DiodeGoneWild - They might retrofitted this thing from tube (voltage doubler) to LED the extra chep way (even for Chinese junk) , because they might had much of this boards catching dust ^^

On the picture its on and looks better :D u think they can hold it on power for photo ?

Are you kidddding meee?

This lamp has an American plug, so it is most likely that the working voltage is 110 V instead of 230 V. So you have destroyed the lamp.

High voltage power network intensive can escape in a small mosquito. + kills flying rats and mouses super interesting

3:37 they made it for the mice. 😂😂🤣

Always your videos are 🇮🇳🇮🇳🇮🇳 Indian vs China

4. Can use for long-term without break

It comes with 20seconds warranty.

Mine is same but a lot dif, 3 big capacitors 2 small 5 diodes 2 resistors the bulb glass runs on 243 volts dc the wires put off 436.6 volt dc

I think it only for 120v

Interesting video, thank you

proč si ten rezistor nezměřil a proč si to nepřipojil to na ten tvůj watt meter já bych řekl že to byl 47ohm rezistor

I think it means when it burns down your house that will kill the mice

Can someone advice what is the part number for the light tube used in this bug zapper ? thanks

Perhaps it was meant for 115V 60Hz

I like the way you speek..,

Seriouslaaaaay? Are you kiding miii?

ty vole, to je strašný... O_o

From where did we get the tubes

can this be charge with cellphone charger? is there portal?

Maybe the guy in your electric chair drawing could hold the mouse kill two birds with one stone.

Hahaha! It's at the same time funny and also sad and deceiving to see this ; to see that so many chineese Compagnies have such a lack of Industrial ethics! No matter why we often say that when something breaks, which came from China, it's just normal, because chineese stuff is cheap. That is sad, no? As a matter of fact, from what I can recall, in social hystory, in the 50's we used to compare Japanese technologies to junk. But, Japan learned, and surely understood that credibility is everything in market. And now, just like they say in back to the futur : " But Dock! All the best things come from Japan!" Anyhow, it's a very good vid! Thank you to have clarified the scam!

Looks like that bug zapper the changed to an LED lamp from a flourescent lamp last minute without testing it perhaps

Best channel this or big Clive

You are really smart

I think that the plug is not Chinese, but US and south America, so this device works @ 115 Vac and not 230 Vac, so this may be the reason you burnt it!