There are these types of mosquito killer racket are easily available in market at some 150 rupees.
This consist an electric fence in the bat portion which has 5000-10,000 volts passing through them. This is not only mosquito repellent, it’s insect zapper. When a mosquito gets in contact the high voltage burns it. The inner circuit consists of battery, a charging unit, and a HV inverter circuit, which I’m going to describe here.
Coil turns will be as described in text and not the one indicated in this tmage.
The circuit consists of a flyback topology transformer driven by a general NPN transistor 2SD965. The feedback coil of transformer is of 10 turns, the primary is of 40 turns and the output or secondary coil is of 450 turns. When this circuit is run by 3Volts, the transformer generates about 2000-4000 volts at zero load, and the output is then coupled 3 times by using 3 IN4007 diodes and suitable capacitors, thus reaching our need of 5000-10,000 volts.
Note: All diodes used in circuit are IN4007 diode, The transistor is 2SD965, and can’t be replaced by BC548, The transformer should be ferrite core.
Below an actual circuit board found in mosquito zapper rackets.
Dear sir,
pls give the sustitute for NPN transister.i could not fine this.
i have one with KSH200 TRANSISTOR...
Hi,sir I m student of final year engineering n I'm using normal mosquito racket to charge capacitor bank...my capacitor bank is designed for 1000v dc 600 micro farad...but using of this racket my capacitor bank is not charging beyond 350 v...what is the problem n how I get more voltage to charge capacitor bank up to 1000 v(DC capacitor bank) plz help
Dear Arup,
i need to use the circuit from this bat in a irgun , to simulate painful hits... thew currnet voltage is too high, how do i go about reducing it...
can you suggest plz
regards
carloz
Hi,
I have 1 racket. The night led is glowing, i think that means battery is ok. But no sound from wire mesh. Any help ? The seller said its chinese. No one repairs.
Can you please tell me battery rating of the mosquito bat? And also please mail me mr.arup.....
Please tell me the battery rating of the mosquito killing bat? Mention the voltage and ampere rating....
If you read the article you will find the answer, its 3v
Hi; I also have a chinese trap racket. The seller now said its chinese. There is no one to repair it. Well the white LED is working fine after charging from AC. I think that means the battery is fine.But it is not killing mosquitos. no sound of any vibration from mesh wires. Any Help ? ?
Hi,
My racket don't kill mosquitos anymore. The white Led is On working fine. So i think the battery is charging fine. Any suggestion ?
Hi Arup,
I got a racket the one which comes with torch.
when I got hme and tested it doesn't seem to be working.
although I get a hissing sound when I press the button to kill mosquitoes however somehow crackle sound doesn't come and mosquitos don't have any effect
can you help
Hey arup,
actully i have the same prob regarding the mosquito racket. I bought a this bat last night or i used it for only 15 minutes. Now its not working. There is no spark in it or led light is working proprly. I dnt have any knowlede about the electricity.. I open it the wire is all set but not working. Plz suggest me what should to do
Hi,
I am looking to build a circuit with a 3kV output from a small 3V-240V supply, would you be able to help me with the circuit design? I understand i would need a transformer and capacitors. If you could get back to me id appreciate it.
Thanks
hi arup, the common problem in these rackets is after Charging it will not get spark or very low intensity psark which will not kill mosquitos. Checked Battery gives 2.8 V when fully charged.
Is there chances of Transformer failure.
Capacitor not shows any fault.
what will be the problem?
2.8v is very low they usually work between 3v and 4v, try changing the battery. If that fails it may be the transistor has failed, they get hot after a few minutes use and have litle or no heatsink to disapate the heat away.
I want to cover my window by using this circuit . Is this possible with this circuit ?
Can i use same circuit available in racket ?
yes, instead of battery try using a plugin wall charger
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