IE37: Mosquito bat, complete repair guide!

[@kanthvickram4490]

After 7 years i saw this video which is highly informative, thank you for that.

[@INSIDEELECTRONICS]

😊🙏🏼

[@GFlCh]

Also, at about 26:17 you mention you're thinking about doing a video on the "voltage multiplier" section... have you done that yet, or are you planning to make it?

[@INSIDEELECTRONICS]

Nope! I didn't made it yet! However, it's still in my long "two page to-do list".😀 Due to my work timings and other life schedules, making videos on time is very difficult.. :D

[@rama5085]

very informative for such an inexpensive device. greetings from Sri Lanka

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback . :)

[@jayarajjayarajua4339]

Very good naration clears many doubts.one can learn a lot from your lecture.thnks. so for i repaired some m bats. Now i got full knowledge.thnks.sr citizen. God bless you. Bangalre.

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback. :) Glad to hear that my video was helpful for you. 😃✌🏽

[@a320214]

Thumb UP !! Excellent video !! Excellent knowledge !! Thanks for sharing !!

[@INSIDEELECTRONICS]

Thanks for your valuable feedback. :)

[@anuragshakya9163]

Hey! Thanks for the video. I bought a new bat the other day but mosquitoes don't die when they come in contact with the mesh. There is no arch or spark in the mesh at the time of contact. Green light glows i.e. it recharges the battery fine, also red on off light also glows when button is pushed. what do you think is the issue here. Thanks.

[@INSIDEELECTRONICS]

Just because the LED is on, doesn't mean the battery is charging. You can follow the steps mentioned in my video to see what is wrong.😊

[@anuragshakya9163]

INSIDE ELECTRONICS! Thanks!

[@prabhakarkannan5528]

thank you. long time i have come back to electronics. your slow and patient explanation is very good

[@INSIDEELECTRONICS]

+Prabhakar Kannan Thank you so much for your valuable feedback. Consider subscribing if you like to support me in making new videos.😊

[@tupai62]

hi, in this circuit has battery charge controller? that control overcharge battery.

[@INSIDEELECTRONICS]

No there isn't any. It continues to trickle charge the battery even after fully charging it.

[@kolardorpe3161]

Sir what's the value of high power PF Capacitor?

[@kingjames-fn8ib]

About the dielectric , have you tried toothpicks? Just use a larger air space between the meshes

[@INSIDEELECTRONICS]

Nope, I haven't tried with tooth picks. But I've tried with larger separation between the mesh but all that is going to happen is it it is going to find another route to ground. Make it too large and the bat becomes useless.

[@ranjithjayakody9541]

Please what is the transformer winding reading.

[@INSIDEELECTRONICS]

There are no markings on the transformer. It seems to be custom made by the manufacturer.

[@kingjames-fn8ib]

what is the optimal battery reading for a new battery? And can you replace the rechargeable ones with brand new aa batteries in series?

[@INSIDEELECTRONICS]

Voltage level of a new battery can be anywhere between 3 to 4 volts. It depends on how long it came out of production. And yes you can connect two AA cells in series but make sure to adjust the capacitor value to decrease the charging current.

[@باسممحمدحسنعلي]

thanks for good explanation . but can we use transformer in stead of batry .

[@INSIDEELECTRONICS]

Thanks.. :) So, you want to operate it at mains level? Instead of battery?

[@incubatork]

You can use a telephone wall charger to power it but use a resistor to limit voltage

[@Zeusmason]

Very clear and understandable video well done mate thanks

[@INSIDEELECTRONICS]

Thank you for your valuable feedback. :)

[@KhinMaungTun-q9u]

Thanks a lot Sir.

[@INSIDEELECTRONICS]

😊🙏🏼

[@kcn620]

What is problem if the new battery is not getting charged sufficiently and goes down .shpuld the charging circuit condenser to be changed?

[@INSIDEELECTRONICS]

Yes it could be the problem. If the capacitor is faulty it may not provide enough current to charge the cell. Also, the new battery may also be bad. Try changing the capacitor and see if it fixes the issue.

[@chandrasekaranvignes]

Super! Excellent explanation.

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback. :) If you like to support me for making lot more videos, please consider subscribing.

[@ghanshyam4534]

Sir your explanation was very much extended but in my racket I found it is charging and when pressed it again shows light but no popping sound please also make how to check the individual component of bat also..

[@nitu0606]

Gteat video!! Have query HS D 965 7L R which equivalent transistor can use here.

[@INSIDEELECTRONICS]

D965 is an obsolete transistor as far as the model is considered. It's by the way a 5A 22V NPN transistor and so you can use any part of similar or above rating. What exactly is your requirement for this part? :) Thanks for the feedback too. :)

[@nitu0606]

@@INSIDEELECTRONICS Thanks a lot for your reply! I have 3 mosquito bat planing to replace existing transistor H SD 965 7L R Looking equivalent similar transistor

[@INSIDEELECTRONICS]

Okay, for such applications you can use the commonly available 13003 transistor. It's cheap and often found in cheap mosquito bat boards. Although you can still buy D965 online. :)

[@shafiqulislam2663]

882,2583,8050,3407,2470,880,135,139,140,D9,2N2222. But pinout could be different.so check before connect and connect properly

[@deepakgm7235]

Thanks for the explanation of the mesh. It gives a good reference point to know if a bat is worth repairing. With the one I have, the outer mesh is already become kind of wavey and is also protruding outside. From your explanation, it will never form that charged field which means I might as well just throw it.

[@INSIDEELECTRONICS]

Yup. Salvage what is good and discard the rest.

[@Random_Movies_edit]

What is the possible problem of my mosquito swatter because I was about to charge it and my son accidently activated it while charging and stop working

[@INSIDEELECTRONICS]

Most probably, the sudden power on while being charged, might have created a voltage spike which instantly killed the switch transistor.

[@Random_Movies_edit]

You mean the transistor was the problem

[@INSIDEELECTRONICS]

Most probably yes. You can test it with the help of a multimeter.

[@simhachalampadi2520]

Where is the purchase this pcb

[@INSIDEELECTRONICS]

Unlike other Chinese items, this pcb cannot be easily purchased as a separate item. But it's very easy to make it by yourself in a general purpose pcb. Or you can salvage it from another mosquito bat as well. May I know what is your purpose? So I can shed some light in the right way. :)

[@homehacksbyRana]

My mosquito bat some time works sometime not. I have changed the tranjistor. and transformer seems okay in multimeter test. can you tell me probable reason? High voltage diode i Can't check.

[@INSIDEELECTRONICS]

Have you tried changing the switch? Sometime, the switch can cause these kind of issue. :)

[@indiancitizen3408]

How does a capacitive dropper bring the voltage to exact 4v to charge the battery without a zener

[@INSIDEELECTRONICS]

Its because the capacitor acts as a resistor in AC circuits. So when used in series with battery the current drawn by it is enough to bring the voltage down to what the battery voltage is.

[@nkatekomisheck6626]

Umm where can I get the bat from , in SA

[@INSIDEELECTRONICS]

The cheapest option will be eBay. :)

[@balakotireddy7006]

Thank you.. Good video

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback. :)

[@dr.amitmitra716]

What's the model no. Of the transformet

[@INSIDEELECTRONICS]

I've no information on that since I've never seen any of these transformers with any kind of info printed on it.

[@entertainkivines7754]

Can you please give information about transformer ? From where i can buy it ? Dont wanna make. Any mod3l no. Or something.

[@INSIDEELECTRONICS]

So far I've found no sellers listing these transformers. Seems like these are custom wound for the manufacturers requirement since there are no part numbers as well. The only option as of now is to take it from another board or wind it.

[@entertainkivines7754]

@@INSIDEELECTRONICS thanks for reply.

[@INSIDEELECTRONICS]

:)

[@ayyoobkhan6642]

I charged battery fully ,after I use bat ,after some time killing power fully reduced and also output led glow dim and full off ,what is the reason battery or capacitor?

[@INSIDEELECTRONICS]

Probably the battery has lost its capacity. You can try replacing the battery. The price is around 40Rs in my area.

[@MrSharma.u]

Hey bro ...how to solve low spark problem.....

[@INSIDEELECTRONICS]

Try changing the output capacitor.

[@MrSharma.u]

@@INSIDEELECTRONICS I changed but then also low spark problem.....

[@INSIDEELECTRONICS]

That means you've to change the multiplier capacitor too after the transformer.

[@MrSharma.u]

@@INSIDEELECTRONICS can you please explain in detail....😶

[@INSIDEELECTRONICS]

First, check the battery. If the battery is old, then it can't deliver the current to create that sparks. Replace if necessary. Then check the two capacitors after the transformer. These are usually blue in colour, and will be before the output capacitor. Check their value and replace if necessary. 😀👍🏼

[@josephthomas4948]

Excellent video keep it up,very informative

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback. :)

[@sureshendla]

I bought few D882 transistors online and installed one, but it didnt worked, can you tell me ow to check the remainingg ones as someone told the output should be more than 9. Let me know whether the transistors are good or faulty ones.

[@INSIDEELECTRONICS]

So you want to check whether the transistors are good or not? If so, using a multimeter in diode mode, measure across the base-emitter and base- collector pins, with the +ve probe connected to the base, you will get a reading of around 0.6V if it is a good one. In a TO126 package, pin 1 is the emitter, 2-collector, and 3 is base.

[@sureshendla]

@@INSIDEELECTRONICS Thanks for your reply, the reading in multimeter is 672 on both. how can we know the voltage of this transistor? I had few questions as watched so many videos on mosquito bat, but didnt get much answers. Checking voltage or testing with neon bilb at transformer can we able to know both transformer and transistors are good? What is the best way to find the exact fault? My bat doesnt spark at all.

[@INSIDEELECTRONICS]

Most good silicon transistors will show around 0.6V only. So that is quite normal. But, if you were asking about the maximum operating voltage of d882, then it is 40V. Regarding the neon bulb method, yes it can be used to test the transformer and transistor at the same time. All you need to do is connect a neon bulb at the output pins of the board, where the metal mesh is connected to the board. Now when the bat is on, the neon should light up if everything is working fine. In your case, the issue could be a faulty battery or a faulty high voltage capacitor. If any of these is bad, the bat will work, but there will not be sufficient power to make the spark to kill the mosquitos.

[@sureshendla]

@@INSIDEELECTRONICS Thanks for your feedback I am closure to find the fault. Their is no spark at all and the transistor is getting hot. The battery is ok and tested with another battery installed a new one too. I will buy neon bulb and will let you know once tested. Thanks again your reply, I am hoping to solve the problem.

[@INSIDEELECTRONICS]

Please note that we cannot measure the output voltage of this transformer directly with a normal averaging multimeter. You need a high voltage probe and also a true RMS multimeter. If the transistor is getting hot, that indicates a possible short at the transformer. Remove it and check the windings. Else the transistor will be damaged. You can get a neon bulb from old mains indicators or an old mains tester screwdriver. Have a good day.😊👍🏼

[@msnavin26]

Where can I get battery??

[@INSIDEELECTRONICS]

You can find it online or from local electronics store. The price is around 50Rs in my area. :)

[@johnsonzacharia8392]

very good explanation

[@INSIDEELECTRONICS]

+johnson zacharia Thank you so much for your valuable feedback .

[@knoxpruett1889]

Very, very nice and informative video. Thank you!

[@INSIDEELECTRONICS]

Thanks for your valuable feedback. :)

[@rd-tk6js]

Well explained, thanks !

[@INSIDEELECTRONICS]

Thank you for your valuable feedback. :)

[@mervynrozairo9199]

Thank you a very good video now I have tried repair a mos bat when I press the button indicator don't lite nor bat doesn't work the even battery don't charge can you explain what is the problem?

[@INSIDEELECTRONICS]

Thank you for your feedback. :) First check weather the battery is good or not.

[@7760468484]

I have one question,What will be the voltage across primary winding of the transformer during operation?

[@INSIDEELECTRONICS]

The voltage across the primary will be the voltage of the battery. Its the high frequency pulsating DC voltage that causes a higher voltage to be induced in the secondary. :)

[@7760468484]

INSIDE ELECTRONICS! This voltage can be measured using multimeter (set dial at DC voltage)?

[@INSIDEELECTRONICS]

Well it can be measured, but not with every multimeter. Because the voltage across the primary (and in turn the secondary) will be a high frequency square wave, not every meters will be able to register the proper voltage. It may show some random average value.

[@7760468484]

INSIDE ELECTRONICS! 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?

[@INSIDEELECTRONICS]

For the transistor to get heated up that much, the obvious reason will be a short circuit. Now that the transistor itself has been smoked, you need to change it anyway as it may have shorted internally. After replacing the transistor, look for any short circuit using a multimeter and also check the resistors in the circuit as an open/shorted resistance can cause a higher current flow. You can get these parts for almost free if you search around in your local scrap yard as people often throw them away for no good reasons. :)

[@ethanhunt4299]

omg! you are the only Indian guy that can speak english with english title oin the video! thsank god!

[@INSIDEELECTRONICS]

Thank you do much for your valuable feedback. :)

[@afsalbro]

Very useful . Thank you. And keep uploading videos

[@INSIDEELECTRONICS]

Thank you so much for your feedback. Consider subscribing to my channel if you like to support me in making new videos possible.😊

[@Robin-hw1dk]

In AC charging time transform making sound and bat also not working, can you explain what is the problem ?

[@INSIDEELECTRONICS]

Seems odd. Because while charging the transformer section is inactive; unless the switch is kept pressed. So.. can you tell a bit more in detail?

[@C72035]

Hi I changed transistors,transform Both but still not working which one should I check how do I check high voltage capacitor

[@INSIDEELECTRONICS]

Check for continuity to the output side and check the output diodes also.

[@RahulSingh-gm8in]

hey bro. In my mosquito racket every thing is ok..but i getting very low output voltage in racket but.when i disconnect the wire of racket trap and shorted the output voltage it gives high spark.. i replaced battery, TR, capcitor but problem is still couldn't solved...plz help..waiting for your reply...

[@iwantsushant]

High voltage ke karan .. bohot sari magnetic dhool net main jama ho jati hai.. jaise ki aapne purane tv ke under CRT pr jmi hui powder soft dhool dekhi hogi... Mosquito bat ke net mai yahi dhool unknowingly voltage ko drop kr deta hai.. So net kboliye clean kijiye.. Bend free kijiye aur reassemble kijiye... Maine same problem solve kiya hai 👍👍👍

[@INSIDEELECTRONICS]

The bat is now totaled. This is because the plastic holders for the metal mesh has lost its insulating property and are now leaking high voltage at the output. That is why the bat gives full power when the mesh is not connected. There is nothing we can do to recover it.

[@RahulSingh-gm8in]

@@iwantsushant hey bro i did it ..but problem couldn't solved ....and there is a sound like ssssssssshhhh from the net.

[@novideo10ksubscriberschall48]

Very good bro . useful

[@INSIDEELECTRONICS]

Thank you for your valuable feedback. :)

[@uncool_05]

Where can i get transformer? Is it available in india easily?

[@INSIDEELECTRONICS]

Unfortunately no. Either you have to rewind it manually or get from another board.

[@uncool_05]

@@INSIDEELECTRONICS thanku

[@sureshendla]

It is available in youtube, someone is selling

[@INSIDEELECTRONICS]

Now the transformer is available to purchase online. Here is a sample link. Please observe caution when making online transactions. The link below is just for reference. Purchase at your own risk. makerbazar.in/products/type-2-mosquito-bat-transformer-for-refurbishing-old-mosquito-bat-pcb?gclid=Cj0KCQjw9ZGYBhCEARIsAEUXITV0BSPYV4Ru5NZpiSWCmwwEDmyVBm6NfgzuAtUw69rFvDJP0IBVMZsaAvqtEALw_wcB

[@balakotireddy7006]

You explained very neatly much appreciated.. Can you please tell me how to check capacitor properly ? When I check charging out put getting 180-220 volt I got surprised (shocked)

[@INSIDEELECTRONICS]

If you are getting around full mains voltage at the charger side, chances are the battery is open. These capacitive dropper rectifiers depends on the load itself to maintain the required voltage, unless clamped by any zener diodes. So if the load fails, the voltage will climb back to the full peak voltage. Checking the capacitor properly requires a meter that can read capacitance. Otherwise all you can do is to use the continuity test. Put the multimeter in continuity mode and touch both the terminals of the capacitor. You may hear a beep for a few seconds and then the resistance will climb until the meter reads OL or something similar. That means the capacitor is okay. If you continue to hear the beep in full volume for a long time the capacitor is shorted. If the meter just reads OL instantly when connected to the capacitor, then its open. But these tests won't show how far the capacity has dropped due to being put to use. If the capacitor has leakage or has lost its rated capacity, it may still pass the continuity test but will perform poorly in circuit. So better test it with an LCR meter if possible. Thanks for your valuable feedback though. :)

[@balakotireddy7006]

@@INSIDEELECTRONICS Thank you once again for prompt response.. Looks like culprit is capacitor i will change and see either it works or not..

[@INSIDEELECTRONICS]

✌😊 Contact me via email if you have any further issues.

[@sathishkz]

I have a busted D965(22V 5A) wat should I replace it with

[@INSIDEELECTRONICS]

+Sathishkumar Vasu I've already provided links to suitable replacement transistors in a comment below . Please go through it to get the full list of transistors.

[@kcn620]

ESP the transformer specifications and availability and thanks for your response.

[@INSIDEELECTRONICS]

I'm sorry to say that the transformer is not available to buy online or in any electronic stores in Bangalore area. Usually if the transformer is broken, you can carefully unwind the coil and wind new one by yourself. It'll be a time consuming work, but that's the only way.

[@chetanpanchal5517]

Very very informative keep it on , upload such a great video/s

[@INSIDEELECTRONICS]

Thank you for your valuable feedback. :)

[@nama.wahyudin749]

@@INSIDEELECTRONICS sini wa

[@INSIDEELECTRONICS]

@Wahy Udin 22 Sorry I didn't get you...

[@nafehash9983]

hai sir my mosquito racket very low out put power now... way is the plm ...? pls replay ... battery is good

[@INSIDEELECTRONICS]

+nafe hash The problem could be anything from the battery to the final voltage multiplier. Does it makes the popping sound when a fly gets trapped? Or is the fly slowly burns away? Did you checked the battery under a load?

[@raja_3738]

Hello sir same problem battery is ok but output is low fly slowly burns

[@INSIDEELECTRONICS]

+Raja roy Try changing the output capacitor. You must use a proper voltage rated capacitor or else it may explode.

[@highqualityamps1699]

Transistors D695 is short... Can I replace with D8050?

[@INSIDEELECTRONICS]

+High Quality Amps Of course you can. It can handle 1.5 amps of current. But it's always a good choice to go for a higher rated replacement component. So here is the full digikey listing for suitable replacement transistors with 2 to 2.5 amp ratings. tinyurl.com/y83zo7sn

[@highqualityamps1699]

INSIDE ELECTRONICS! Thanks... But the pin out is different ...?

[@INSIDEELECTRONICS]

+High Quality Amps That is fine. You can adjust the leads to fit the proper way. The collector pin of new transistor should be adjusted to fit in the existing collector point, like wise the remaining pins also. 😊

[@patelpritul2510]

@@INSIDEELECTRONICS sir D965 ki jagah konsha tra laga ye

[@INSIDEELECTRONICS]

Sorry I didn't get you.. :(

[@youtube_official_user]

can we attach a long wire directly to this BAT input end and Use ti With 220v direct AC volt supply without using BATTERY....because these bat batteries are very weak.

[@INSIDEELECTRONICS]

In theory it is possible. But it will easily burn the transistor within the first few usage. I've tried it myself and found to be useless.

[@muneerwahaib6359]

thank u for sharing this very informative vid. ... 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 .

[@shoaibsiddiqui9188]

good explanation thank you.

[@yadagirinarlagiri]

Hi

[@muraliashok6739]

Thanks Very good explanation, really helpful

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback.:)

[@vishweshwarkavri386]

👍

[@INSIDEELECTRONICS]

:)

[@iwantsushant]

Pin voltages ...... which points how much voltage expected??

[@INSIDEELECTRONICS]

At what points? Its not possible to measure the output side with any normal multimeter because the output side is in higher frequency and can mess up the readings. Input side is normally under the battery voltage besides the charging stage.

[@db1236]

My racket has a dead LiTian AA 600mAh 2.4V battery pack. I would replace it, but is it Ni-Cd or Ni-Mh?

[@INSIDEELECTRONICS]

Most probably it'll be ni mh. But better check in its datasheet if available.

[@db1236]

@@INSIDEELECTRONICS unfortunately no datasheet available :(

[@INSIDEELECTRONICS]

Not to worry, these Chinese batteries usually don't have any datasheets available. You can replace it with ni mh batteries.

[@rakeshghodse4905]

Where we can buy the circuit board?

[@INSIDEELECTRONICS]

Unfortunately, there are currently no way to buy the exact circuit board online from India.

[@luffymonkey6487]

Where to buy the battery?

[@INSIDEELECTRONICS]

You can buy it for around 35/50 Rs from any local electronics store or from eBay.

[@tozenreyes9778]

Can u make a video on how to direct to an outlet , rather battery use. Convert it!

[@INSIDEELECTRONICS]

It is possible to convert it and I've personally tried it 3 or 4 times before. 😀 However I didn't recorded doing it because 1. The entire bat becomes reference to AC mains and it might kill the user rather than the mosquitoes, if not used properly. 2. The primary winding of the transformer and the switching transistor got damaged in all 4 bats within the first 20 minutes of use, no matter how many different resistor values I've tried. (sometimes the resistor itself burns before the transistor.) So I don't want to make a video about something that works only for just a few hours and also unsafe. 😬 Anyway I will still keep this as a to-do project. 👍

[@exotic4u1]

in my instrument fly slowly burns away n there is no pooping. how can i rectify?

[@INSIDEELECTRONICS]

+Kapil Kumar Check the battery and the final capacitor and replace whichever is faulty.

[@prabhakarkannan5528]

most of these boards do not have transistor or condensor specs. pl help.

[@INSIDEELECTRONICS]

+Prabhakar Kannan The transistors used in these are general purpose high frequency switching transistors. You can easily find the datasheet for most of them by a simple Google search. Capacitors usually are metal film capacitors that doesn't have a specific manufacturer. So they don't have any datasheets. But they are quite easily available from any electronic shops for cheap or else you can salvage high quality capacitors from old tv circuit boards. ✌

[@vineethkumar7803]

Hey good explanation.

[@INSIDEELECTRONICS]

+Vineeth Kumar Thank you for your valuable feedback. Consider subscribing if you like to see more of these videos. 😊

[@piyushkcnlu]

The red plastic of my mosquito zapper sliding switch has broken. How to add external switch in the circuit?? Thanks

[@INSIDEELECTRONICS]

If its the sliding switch that is broken, then the easy way to get around is to solder the slide switch terminals together. Then the second push button switch can be used for turning the bat on/off.

[@piyushkcnlu]

INSIDE ELECTRONICS! Thank you very much. I soldered two wires on the terminals of circuit where the broken switch is present and i bypassed that switch by affixing push on/off switch on the handle. :) Again lot of thanks

[@UnleadedPadyak]

I'd like to power these with 18650 3.7v batteries because the batteries in the AC rechargeable ones die quite fast. Of course I would lose the the AC recharging but I do have mutliple 18650 and a reliable xtar charger. I was planning to use an LM317T but I found out that the min Vin - Vout = 3.0v but these are typically powered by 2.4v nicd. and that's just a 1.3v difference, way below the the minimum voltage drop. I was wondering if I can modify the circuity myself. minimal electronic experience.

[@INSIDEELECTRONICS]

Instead of trying to charge the li ion battery with AC power, you can remove the NiCad charger circuit from the board completely and use a cheap Chinese battery protection board. These are available in eBay for as little as 1 dollar for a pair. You can then charge the battery using any USB power supply. That will be the more economical also.

[@UnleadedPadyak]

Yeah, I have a reliable charger and am not trying to charge the Li Ion thru AC. What I want to do is drop the 3.7v to 2.4v since my bat is powered by 2xAA rechargeable. I tried powering it directly by 3.7v and the solder of the power wires melted. fun stuff. Thanks for answering.

[@kandasamy363]

@@UnleadedPadyak you can series with 2 in4007 diode between + side battery and board. It reduces 1.2 volt and you get 2.5 volt at circuit board.

[@UnleadedPadyak]

@@kandasamy363 ohhh! Would have been very useful 4yrs ago. The newer bats do have removable 18650 batteries now so no reason to do this now really.

[@kandasamy363]

Thanks 🙏

[@maheshverma1839]

What is the value of out put capacitor

[@INSIDEELECTRONICS]

Usually around 22 nf @ 2kv rating. But could be different in different boards.

[@vjekoslavcvetnic7500]

In my case is 0,47uF 400V and it failed and it was shorted, I had to repleaced it.

[@samirwadke]

Can you please share the diode number used ?

[@INSIDEELECTRONICS]

Samir Wadke The diodes are all 1N4007 rectifier diodes .

[@eubyvaz568]

INSIDE ELECTRONICS! Thank you for the video. My bat uses RFC4K diodes, all of which are open. I can't find a replacement. Is there an alternative that can be used instead?

[@INSIDEELECTRONICS]

These are high voltage low current fast recovery type diodes. You can find some alternatives from here: ppmpower.co.uk/4kv-fast-recovery-diodes-now-standard-release/ Or search for UFHV4k diodes. But these are somewhat expensive compared to regular diodes.

[@sekhar9722]

Battery voltage 4, red light On but green light not getting on when charging, spark is low what is the possible reason

[@INSIDEELECTRONICS]

Check the section where the green LED is in. Probably the charging capacitor is faulty - assuming the green LED is in the charging section. If the battery is low the sparks will be low. :)

[@7760468484]

One question, how the circuit converts 220 volt AC into approx. 3volt DC to charge the battery without using transformer?

[@INSIDEELECTRONICS]

Its because they are using a capacitor in series to the bridge rectifier. That way the capacitor acts like a resistor (and the property is called reactance) which will reduce the voltage to whatever we desired (here 220v to 4v), but without much wastage as if a resistor was used. It's a very common and cheap way to convert AC to DC. But the main problem with this type of capacitive "series dropper" circuit is the risk of electric shock. Since there is no isolation between AC side and DC side. Also the voltage will shoot up to full 300 volts (RMS value) if there is no load connected. So it is not safe.

[@ratnadeepdhar4816]

Prakash Chandra very nice explanation Sir

[@akhilac.m8092]

can i use car 12 v battery

[@INSIDEELECTRONICS]

Nope. The circuit will get toast!

[@akhilac.m8092]

could you please help to make this circuit using car battery .... can i use 7812 voltage regulator to reduce this high power

[@INSIDEELECTRONICS]

7812 is a 12 volt output regulator so is the car battery voltage. You can bring it down to 5 volts using any ordinary car phone charger. Inside the bat, make a 3.3V regulator with heat sink and connect the input to a micro USB port, which will connect to the car charger, and the output of the regulator to the points where the battery was connected. This is the cheapest way to do it.

[@akhilac.m8092]

@@INSIDEELECTRONICS sir, i want to use this mosquito bat in my shop .. so i have only this car battery .. ( car battery charging only once in my home ) using this battery power can i made this mosquito bat? pls help me .. i'm totally confused..

[@INSIDEELECTRONICS]

Yes you can. Buy any car USB charger and connect the input + and - pins of charger to the corresponding pins of the battery. Get an old USB cable and cut it open. Inside, find the + and - wires and solder this to the + and - points inside the bat. For added protection, connect a 1N4007 diode to the +ve wire of USB cable. That's it. :)

[@nkatekomisheck6626]

Best vidio but can you make a video explaining all the components

[@INSIDEELECTRONICS]

Yes of course. I shall do that in the future. :)

[@balakotireddy7006]

Can I use old Mobile phone battery (3.7v) instead of LeadAcid battery? Any one can answer.. Please..

[@INSIDEELECTRONICS]

I've tried it. It will burn the transistor if you use it for more than a few seconds, because there is no current limiting here.

[@mukeshsinwar5328]

Bhai yeh circuit kanha milega

[@harveshsinghthakur6667]

Good vedio cover all problem

[@INSIDEELECTRONICS]

Thanks for the valuable feedback. 😊

[@sohamdutta2007]

very patiently and well explained.. I have four bats which I believe the battery is mostly fine and i need to get a replacement capacitor. Could you kindly suggest any capacitor which would probably fit all of them or rather any common name by which shopkeepers can understand my requirement and give it to me.. merely saying I need a high voltage capacitor of 2kV won't suffice I guess.. (I'm not a professional, just a DIY guy to be honest.)

[@INSIDEELECTRONICS]

+Soham Dutta Thank you so much for your valuable feedback. I believe you are talking about the final capacitor that is connected across the mesh terminals, if so the replacement capacitors are usually 470nf 1600V or 680nf 2000V. Basically the higher the capacitance value the larger the zap will be. But it will drain the battery faster. You can check for any markings on the capacitor and replace it with another of the same value. :)

[@sohamdutta2007]

+INSIDE ELECTRONICS! thanks. yes that's what i was referring to. I guess a better zap is the one to go for 😁. Well, Most don't have any value written on them. So will selecting 680nf 2kv serve it all? And are they actually commonly available in the market? and any idea what it's reasonable price should be approx?

[@sohamdutta2007]

+INSIDE ELECTRONICS! also how do you procure lead acid cells if they are dead or weak? is it rather better to abandon it in that case?

[@INSIDEELECTRONICS]

+Soham Dutta Well it depends on which lead acid batteries are you referring to. If its regarding those found inside these mosquito rackets, its better to discard it. But the bigger higher capacity cells can actually be brought back to life. Sometimes all it takes is a bit of electrolyte. You can search on KZbin for how to do it. :)

[@INSIDEELECTRONICS]

+Soham Dutta Sometimes it has some markings in it. If it hasn't any, then it's safe to go with the above cap. :) The price for those are actually cheap. Its like 10 Rs for a pair I think. But sometimes it gets cheaper.

[@ulhasjunavane937]

We're I parches components

[@INSIDEELECTRONICS]

Which component are you looking for?

[@bulate0101]

Hello! Mine also have faulty battery, do you think connecting the battery wires to usb and then using a powerbank is okay or safe? I saw it from here watch?v=IncCAdTyaBU (yt doesn't allow links, so just the last part of the url)

[@INSIDEELECTRONICS]

Even though it is possible to do so, I don't recommend it. Because these boards do not usually have any sort of input protection. And it depends on the internal resistance of the lead acid/zinc chloride battery for the current limiting. So when you connect it to a power bank, there is a possibility for damaging the output section. Use it at your own risk.

[@bulate0101]

@@INSIDEELECTRONICS Alright thank you bro!

[@shremanth]

My mosquito bat is killing mosquitos but not making sound.. Pls guide me... What I need to Change...

[@INSIDEELECTRONICS]

Well... if the bat kills mosquitos, then your bat is working fine I guess. Some bats may not make much noise so that's pretty normal. :)

[@jmenterprises9906]

thank for explain good and i need how to check components in board with is problems

[@INSIDEELECTRONICS]

Thank you for your valuable feedback. Which component do you want to check in this board?

[@TT-ii5bu]

Why dont publish simple circuit on paper ?

[@GFlCh]

Nice video! Perhaps you cover it in another video, but unless it somehow doesn't matter, you didn't mention troubleshooting in case of non-rechargeable batteries like units with two "AA" cells or two "C" cells.

[@INSIDEELECTRONICS]

Thanks for your valuable feedback. :) I was thinking like, in case of a bat with replaceable battery, the first obvious thing people will do is changing the battery. That's why... :P

[@sanjaysomase8302]

Nothing u miss sir good explain

[@INSIDEELECTRONICS]

Thank you for your valuable feedback.. 😊

[@swagatkumardas9834]

switch ke pass jo resistance lga wo kitne ohm ka hai

[@INSIDEELECTRONICS]

Sorry, can you ask me in English?

[@swagatkumardas9834]

INSIDE ELECTRONICS! Bro What is the value of resistance in the back side of press switch

[@swagatkumardas9834]

INSIDE ELECTRONICS! What is the value of charging circuit of both resistances

[@INSIDEELECTRONICS]

It actually varies from board to board. The one in my video my not be the value used in yours. If you can share the picture of your board, I can help you to find the replacement values.

[@INSIDEELECTRONICS]

In charging section there are only two resistors. One across the capacitor to discharge it after turning the AC input off, and another one connected the LED. The resistor across the capacitor will always be a high value, for e.g. 680K to 1M ohms. This should not be less than 470K. The other resistor connected to the led is around 10k. But as I said, the values varies from board to board.

[@badtensioner]

The circuit used for reducing 220 to a lower voltage is a transformerless circuit using a big mylar cap coupled with a computed resistor. When any of these is damaged the output voltage going to the battery is also unpredictable, or most likely, very high. This destroys the battery in a very short time. Usually, the cap/resistor tandem is for small current only. If the circuit is forced to give a higher current, the cap/resistor tandem collapses, and the battery will eventually die also. To be practical, DO NOT SWITCH ON when charging. The power will also come from the cap/resistor and battery at the same time. This forces a high current through the cap/resistor. The other parts may or may not be affected, but the bat does not work anymore because the battery is busted, about 98 percent of the time, the battery is busted. I've used / destroyed a lot of these gadgets. Now, I'm using one in my outdoor kitchen. I don't need to charge or replace the battery anymore. I swing it around like a badminton/tennis racket and I'm sure I really hit a lot of those flying critters.

[@INSIDEELECTRONICS]

✌😊

[@arunsaravanan2444]

Transformer name plz

[@INSIDEELECTRONICS]

Step up transformer... :)

[@arunsaravanan2444]

@@INSIDEELECTRONICS Value or specific number

[@INSIDEELECTRONICS]

Nope. These are not available for purchase in the consumer market and so there are no markings or specifications available.

[@arunsaravanan2444]

@@INSIDEELECTRONICS Okey thanks

[@INSIDEELECTRONICS]

:)

[@piyushdhokiya8004]

How to check transformer. Out put capacitor is ok. No high voltage o/p, transformer secondary pin no voltage, primary all pin have voltage showing.

[@INSIDEELECTRONICS]

You can run it through a dc voltage continuity test. Use a 9V battery and an LED with resistor to check the secondary side.

[@simhachalampadi2520]

Very very good information thank you sir.please I want same pcb

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback. :)

[@mehtabmanik]

VERY VERY NICE ENGLISH WITH PERFECT ACCENT. EACH WORD WAS VERY ACCURATE BUT DO NOT MIND YOUR VEDIO BECAME LENGTHY.

[@INSIDEELECTRONICS]

Thanks for your valuable feedback. 😊

[@vskivines2461]

Sir mere rakit me red light nahi jal Rahi

[@INSIDEELECTRONICS]

Sorry.. can you please ask me in English ? :(

[@vskivines2461]

Sir green light (charging light ) is on but when I press the button so red light is not working ( on ) in my moskito rakit. Please give me suggestion.

[@INSIDEELECTRONICS]

Please check your battery first. I think its time to replace them. :)

[@rojinphilip2909]

Nice video bro, I think my filter cap at the swatting end is gone. Will update.

[@INSIDEELECTRONICS]

😊 Thanks for the valuable feedback .

[@khhkihg]

Hello sir I watching your video mosquito bat repair video some face my mosquito bat when I press button led bulb glow mosquito bat not sparked light not show I thing spark capecitor weak which valve capecitor repleace tell me sir

[@INSIDEELECTRONICS]

+Babu E The value is usually printed on the capacitor itself. You can replace it with any non polar high voltage capacitor (not less than 1600 v) which typically are of 470 nf 1600v or 680 nf 2000v. Also check whether the battery is good or not.

[@kslvvaraprasad5864]

wow excellent video...made very good explanation.i am in search of a good explanation like this .I want to make a mosquito killer for my home ( hate these China made) .can you help me in this

[@INSIDEELECTRONICS]

+kslv varaprasad Thank you so much for your valuable feedback. Consider subscribing for supporting my channel. 😊 Yes, I can help you with what I know.

[@georgelkhiangte7524]

Very clear explanation video. Thank you so much for your valuable video.

[@INSIDEELECTRONICS]

Thank you for your valuable feedback . :)

[@ravitejamadala]

Use meter to show the component checking

[@INSIDEELECTRONICS]

I'm planning for a video in that specific topic. Thanks for the feedback :)

[@zozo71zozo71]

@@INSIDEELECTRONICS good

[@kumarygood5661]

Tq Bro

[@INSIDEELECTRONICS]

😊

[@highqualityamps1699]

Please reply with a suitable transistor

[@mohamedmifras7530]

Use D882

[@patelpritul2510]

@@mohamedmifras7530 and adhre tranjishter no

[@pratikchandu7848]

Bhai transformer kharab ho gaya hai, kahi nai mil raha hai, plz guide kaha milega

[@INSIDEELECTRONICS]

This transformer is not readily available in market and also because it doesn't have any part number usually, it's hard to get it online too. What you can do is wind it by yourself or get if from any other similar board.

[@PankajSingh-zz3dp]

Sr ise banana sikhaiye

[@jeovane.]

Hi! Thank you for the video. Could you please tell me the specification of the output stage diodes (multiplier section)?

[@INSIDEELECTRONICS]

+Jeovane Sousa The diode datasheet contains all the exact specifications pal. It varies from diode to diode. So to get the specifications for your particular diode, just do a Google search with the part number. :)

[@jeovane.]

INSIDE ELECTRONICS! I am sorry if I was not so clearly. The diode code number is what I want to know.

[@INSIDEELECTRONICS]

+Jeovane Sousa The diodes usually are 1N4007, ordinary 1 Amp rectifier diodes. The datasheet can be found here: www.google.ae/url?sa=t&source=web&rct=j&url=www.diodes.com/assets/Datasheets/ds28002.pdf&ved=0ahUKEwjUo7GVuanYAhWFthQKHXHOBBMQFggxMAA&usg=AOvVaw0mgOEo_CdF9-jRD6quq7vm :)

[@cliffjohnson2273]

well when they burn out in 10-15 hr. you have kill 300 or so yellow jackets it is not cheep. All though they are warranted but still. put the swatter on a wood frame six-inch off the ground put half can cat food fish put a rubbery band on the switch to keep it on. every 6 hr change the batteries . clean of the grid of dead yellow jackets and flys and set it up again.

[@INSIDEELECTRONICS]

But why do you need to change the batteries every 6 hours, when you can buy the rechargable battery type fly swatters? They come with lead acid batteries and mains operated battery chargers in one single unit. Just keep it connected and it'll run on mains voltage just fine! :)

[@josephthomas4948]

I really appreciate yr effort to make it clear all the problems in a mosquito bat thank you

[@INSIDEELECTRONICS]

Thank you so much for your valuable feedback and support. :)

[@sergen6603]

@@INSIDEELECTRONICS ура. Сцсоупциупт / с с лонд! -,2&2’цмц /‘ Ушиц э