Insect terminator reverse engineered (and one-way teardown)

I thought it would be interesting how does this cheap high voltage circuit work, so here it is! I was slightly confused by the wrong datasheet and with strange capacitor arrangement in the schematic, but I think I got it worked out - let me know if I was wrong in the comments! This cheap fly zapper is worth getting for the circuit alone I think, that's if you wish to get low power high voltage source. Oscillator is basically a Joule Thief, with third winding added on transformer for high voltage output and going through a voltage tripler - awesome simple! Enjoy!
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[@user-do9le6lc8y]

wow, the way you explain about a transformer and how the circuit works is just awesome.

[@YahushuaMessiah777]

I really enjoyed this, very thorough, thanks.

[@a320214]

Thumb UP !! very instructive and clever !! THANKS for sharing !!

[@hiteshkumarsingha5042]

Nice work. Well explained i was really looking up for it ...

[@ronalddhs3726]

Hi, Though I owed to praise you for the quality of your content; keep them coming. Thanks.

[@randomtronic]

Thank you! I will keep them coming. Driving this channel is becoming an obsession! :) (in a good way though!)

[@NoName-bt3oy]

Yes, these are nice excursions, am looking forward to each new vid. You have a style and a path, stick to it and may horizons be bright.

[@dr.mdx786]

Thanks alot for that detailed explanation

[@abeilleslade]

Good explanation. Thank you.

[@nizarnilambur]

Thanks sr, lot of videos i looking for working principle of this diagram, Now I am happy

[@TheJavaSync]

Nice explanation, loved it

[@TheJavaSync]

& if .. we use 2s lion bat (@6v) - is output voltage goes 2x higher too?

[@lorilimmer5935]

Pre installed fly... Lol

[@ravikumar-lx3sx]

Nice explain sir

[@samford9623]

Great vid👍

[@smokemirrors1531]

I like what your doing... calm

[@nizarnilambur]

Good explanation

[@johnrees44..G4EIJ]

Hi there...Excellent video, but despite the poor build quality the device works brilliantly, disposing of flies and small bugs instantly and stunning larger bugs and wasps... Poor build quality, yes.....but at one pound, fantastic value for money and certainly not a toy in my opinion...Loved the video..thank you..

[@monstermastert7314]

Wonderful explanation. Is there a possibillity to emproove this kind of fly swatter ? The flies often are only knocket out and awake after some minutes.

[@seemakhalidseemakhalid352]

Hi Most Respactable Sir very nice Gide

[@edgeeffect]

"something resembling metal" :D :D :D :D

[@eduardoasta]

Thanks for this video. It is the 1st which approaches to it technically. I have looking for info about how to modify this circuit to make a real mosquito bat which would run for prolongued time. Do you think is it possible?

[@diosjose9180]

Excelente

[@Edmorbus]

Thanks for sharing

[@randomtronic]

Edmorbus you are welcome!

[@Edmorbus]

Thanks how to make hart on youtube ?

[@randomtronic]

+Edmorbus its a new feature. For me it comes up next to thumbs up icon in YT app on android :) But it is not yet present in creator studio, and i think it is available only to creators (i could be wrong) so you can give hearts on your own vids only (again, i think lol)

[@robflynn5339]

Thanks very good

[@ManojSingh-dy7qt]

Bro change the title and it will be fire,amazing content

[@3D_Printing]

1:45 The say Smoking is bad for the health ; LOL

[@electronicdiy8544]

RiP to the insect who had to sacrifice his life😂😂

[@YahushuaMessiah777]

Can you or have you also reversed engineered an RF circuit, like what is used for RC cars, planes, and servos?

[@muneerwahaib6359]

Thank u so much , v. useful video ! ... Sir , I need a way to modify EITHER , this type of zapper racket .. OR .. the big electrical - AC operated - one , to be operated continuously by DC 12V of solar system ... Is there any way to doing so , you - or any one else here knows - PLEASE explain it in a reply !!! ... thank you in advance .

[@brunetton]

Thanks !

[@captaincrazy5008]

XD pre installed fly

[@Kenforfish]

what is the difference between a bug zapper and Taser gun? Is it possible to make a bug zapper without the a Flyback transformer?

[@electromagic3111]

Hi Mr randomtronic I have question To protect transistor from voltage spike or surg...etc at the base should i use a diode or zener In case of a zener which value Of break down voltage ? N if that value depend from transistor to another? Thanks

[@cruzrodriguez6868]

Excellent video but would you please let me know about all component values a if it available, the transformer windings

[@randomtronic]

Hi, I would love to help, but I no longer have this zapper. But you can find one on eBay for about £1.

[@7760468484]

Excellent video.very nice explanation.I have one question,What will be the voltage across primary winding of the transformer during operation?

[@randomtronic]

Primary was switched directly from supply voltage, in this case 3V.

[@7760468484]

randomtronic thank you for the reply.In many insect terminators I have seen in the market comes with rechargeable battery.But when I see the circuit it does not have step down transformer to convert 220volt AC to approx 3volt DC to charge the battery ,instead it has some resistor and capacitor and bridge rectifier.How it works?

[@randomtronic]

Prakash Chandra hard to say without looking at it, but I suspect, that there will be a "capacitive dropper" - that's the mains rated cap, to limit the current from mains, the bridge rectifier to convert it to DC, and then a resistor voltage divider to get appropriate voltage to charge the battery, which would likely be NiCad in that scenario. Not a very safe circuit if you ask me, simple and it does work, but not safe due to lack of isolation from mains.

[@7760468484]

randomtronic thank you.I saw the circuit.It has 1 capacitor(CBB21 564J400V) in series to the AC and also one resistor (R684) across the capacitor.This is then connected to bridge rectifier(MB6S).The out put (+ve )from Bridge rectifier is connected to 100ohm resistor in series to battery.

[@7760468484]

randomtronic I shorted the push button to check the voltage.but after some time I saw the transistor (D965)over heated and started smoke.I checked transformer after desoldering from the circuit and the primary winding reads 5.72 ohm, feed back winding reads 0.52ohm, secondary (high voltage) winding reads 1.24H.Voltage across the battery is arround 4volt with load.What will be the problem with the circuit for not working?

[@tupai62]

for battery Energizer fence, is it also can use this circuit?

[@3D_Printing]

I think it's like a Villard circuit -Voltage doubler en.wikipedia.org/wiki/Voltage_doubler en.wikipedia.org/wiki/Voltage_multiplier

[@jjeairborne8428]

Please tell us what is the purpose of the two resistors in series and parallel to the 2KV capacitor. Thank you, great video congrats!

[@randomtronic]

Those are there to discharge the cap once power is removed. Just safety reasons.

[@steps0x029a]

Hey, I have a similar circuit from another model of fly swatter that uses a single capacitor and a single diode. I'm interested in how it works, would you mind getting in contact with me? I think I know it, but I'm not sure - especially regarding safety issues. I really liked your video and it cleared up quite a lot for me, so thanks in any case :)

[@hannelmahinay6288]

sir try to make a simple circuit with this so that i can convert it to a marble gun trigger? pls teach me your video is so interesting.. thumbs up

[@rambharosisharma6804]

Please explain cavity of transformer . I.e. volt , ampiyar , waat What are the values of volt , ampier &watt

[@hannelmahinay6288]

sir how about collecting some electronic parts from cfl bulb like transformer or toriodal transformer , can we make a bug zapper from that electrical consuming device........? i want to convert this electric spark to a marble gun it could be? sir?

[@sohailmehmood9144]

Fly comes free with goods

[@randomtronic]

Lol!

[@randomtronic]

Lol!

[@soorajos1]

Nice video. Can you please simulate this circuit in any software such as proteus, tina, ltspice XVII etc...

[@randomtronic]

+sooraj os Hi, maybe I will do a video on circuit simulation, but I am not promising when. Time is an obstacle, and I have a few things I want to get a move on with.

[@soorajos1]

Thanks for ur replay, if you are doing it within 2 days , it will be more helpfull to me.

[@randomtronic]

+sooraj os sorry, but i will not be able to do it this quickly :(

[@soorajos1]

k. its fine.

[@bengienickSerrano]

Hello, I would like you to help me I have a question, this circuit could work for a long time if I cancel the button so that it is always on? Thanks in advance.

[@conesillyvalley7182]

Yes but then remove the battery and add power a adapter

[@arielmcdowny2367]

I got one question sir. In the voltage tripler the current starts from the negative terminal of the transformer but you start rewriting the flow of current in the positive terminal.

[@randomtronic]

Not sure I understand, there are no positive or negative terminals on transformer, it's AC

[@arielmcdowny2367]

@@randomtronic oh okay, thanks for the info.

[@darylcheshire1618]

is that a single Cockroft-Walton circuit?

[@SyedArif797]

Can you please tell me the winding number for all three wire? It would be helpful if you do. I want to make such a step up transformer. Thanks.

[@randomtronic]

Syed Ariful Islam Realative windings number is super easy to calculate - ratio is directly proportional to voltages ratio.

[@Viveaktiwaari]

HOW TO CHECK TRANSFORMER OF INSECT TERMINATOR

[@PF-gi9vv]

Ohhh, If only you had tested the 3rd coil then we would have little more understanding of the circuit, you still get a like though.

[@bluhuptie]

The screws are made out of Chineseium

[@dwight9261]

what is the total capaxitance?

[@qureius494]

Do you use apsara pencil?

[@skrame01]

Are you Big Clive? A wire fell off.

[@rameshvandhnani8960]

Show easy circuit of mosquito bat

[@haridaspanicker5888]

They must have charged you extra for the sample fly! Very sad! Quality control must be very poor or not existent in the factory where it was made. Or it was assembled in a opium den full of flies!

[@hirabhaikher9680]

Sir please you speech ln hindi I can't understand in English So please i nid help

[@eduardoasta]

Thanks for this video. It is the 1st which approaches to it technically. I have looking for info about how to modify this circuit to make a real mosquito bat which would run for prolongued time. Do you think is it possible?