Home Top Ad

Mosquito Killer Bat Circuit Working Explanation

Share:
Mosquitos are like tiny vampires and present in every corner of the world. These are truly a nuisance, as they not only cause painful itching in the bite area but also have the potential to spread horrible diseases such as malaria. No matter how much you try to reduce their population, mosquitoes just keep growing in numbers.

A cool way to eliminating these "devils" insects through electrocution. A mosquito killer bat is designed just for this. In the market, you will find mosquito bat priced at around Rs 100-150. But the question arises do you know how does a mosquito killer bat works, what inside the handle, and mosquito killer bat circuit diagram? Let's learn about Mosquito killer bat and Circuit diagram with working explanation.


What is a Mosquito killer bat?

A mosquito killer bat is also called electric flyswatter, mosquito bat, racket zapper or zap racket. These devices are hand-held and similar to look badminton racket or tennis racket. Inside the handle of a mosquito killer bat contains an electric reachable battery and a circuit board.

The mosquito killer bat circuit is made with an electric oscillator, a step-up transformer, a voltage multiplier, and a charging unit that charges the electric battery. This circuit similar to the circuit in an electroshock weapon or stun gun, but the output voltage of mosquito bat much lower power about 500 to 3000 volts of direct current.

How does a Mosquito killer bat work

The mosquito bat will be activated by pressing and holding the button. The grid of the device electrically charged, a fly nearly bridges in the gap between electrodes, a spark jumps through the fly and high voltage burns it.

Are Mosquito bats Dangerous for humans

  • For safety reasons, may mosquito bats have a three-layer grid to prevent people from touching both electrodes.
  • A limit on the charge stored in the capacitor and discharge of less than 45 micro coulombs (µC) which is considered safe. So there is no possibility that currents from the electric flyswatter will flow from one arm to the other, partly through the heart. This means that the capacitor of 1000V electric flywater should be less than 45 nanofarads (NF).
  • The maximum continuous flow of most electric flywater is less than 5 milliamps (mA) current after the initial discharge. This secretion is safe, even when flowing from one arm to the other.

Mosquito killer bat Circuit diagram

Schematic of mosquito killer bat circuit is shown below.

Schematic of Mosquito killer bat circuit

Working principle of Mosquito killer bat circuit

The working principle of mosquito killer bat circuit is explained in detail here. The circuit board of a mosquito killer bat aka mosquito flyswatter is a combination of three different circuits namely charging circuit, high voltage generator circuit, and voltage multiplier circuit.

Charging Circuit

A mosquito killer bat circuit gets power from an electric reachable battery. Therefore a charging circuit needed to charge the battery. This type of circuit is known as the transformerless power supply or capacitive power supply. After a full charge, the battery gives services 5 to 8 hr (depending on the users).


High Voltage Generator Circuit


A high voltage generator circuit is the most important part of the mosquito killer bat circuit. This circuit converts the low DC voltage to high voltage AC voltage about 200 to 230 V.

The Blocking oscillation concept is used in this inverter circuit, wherein only a single NPN transistor and a center-tapped transformer is used.


Transformer Core Type

Transformer Core Type
Transformer Details -.
  • Models: EE16 Transformer.
  • Dimension: 17mm x 16mm.
  • Type: High Frequency Transformer.
  • Phase: Single.
  • Winding Structure: EE.
  • Bobbin Material: Thermal insulation board.
  • Working Frequency: 1 kHz-200 kHz.

Here is a small EE-type ferrite core transformer used and no air gaps between them. The primary winding (L1) is 30 turns with 0.2mm copper wire, feedback winding (L2) is 10 turns with 0.2mm copper wire and secondary winding (L3) 450 turns with 0.05mm copper wire.

Voltage Multiplier Circuit


As we see high voltage generator circuit converts the voltage about 200 to 230 V, which could not build up the required voltage to create the spark between two electrodes in the mosquito killer bat. Therefore a voltage multiplier circuit needed to step up the voltage.

51 comments:

  1. Which transistor is used in this Chinese mosquito zapper circuit?

    ReplyDelete
    Replies
    1. You can use d2583, d882, d8050 or equivalent transistor.

      Delete
  2. Great explanation sir...

    ReplyDelete
    Replies
    1. How many types of batteries are used in MK Bats. Just myself checked and found atleast two types. One is 4V/0.4Ah but in another bat (model EN-07MS) the battery is little bit larger and may be of higher volts or Ah. Nothing is mentioned on this battery. So just I wanted to clear if some more types are used. Subhan it, can we share our contact nos.for any furthermore.

      Delete
  3. what is the total cost circuit with battery.

    ReplyDelete
    Replies
    1. You will not find these Circuit board readymade in the market or online stores.

      You have to buy a Mosquito Killer Bat first.

      After that, when you open it, you will get a circuit board and a rechargeable battery (make sure the bat has a rechargeable facility).

      Delete
    2. Exactly correct suggestion

      Delete
  4. C1 specification 0.68 micro farad and voltage?

    ReplyDelete
  5. What will be rating of the battery

    ReplyDelete
    Replies
    1. Mostly, a 4 V 1000-1500mAh lead acid battery is used.

      However, there is some bat that uses one or more 3.7 V 2000mAh lithium batteries and for this, the charging circuit is also different (you can use here tp4056 module).

      Delete
  6. Is 223 outout capacitor is 2kv AC or 2kV Dc

    ReplyDelete
    Replies
    1. It is 22nF 2KV AC and pulse metallized polypropylene (PP) film capacitor.

      Delete
  7. Is the transformer turns ratio are correct to step up 3V to 200V?

    ReplyDelete
    Replies
    1. Hi I need output 10w only for project work what changes I need to do in this circuit

      Delete
    2. Replace the transistor with power transistor like TIP35, TIP3055, etc.

      Delete
  8. What may be the fat for fluctuating dc charging voktsge 6volts. It is fluctuating between 6 to 80 volts. Changed .68capacitor also. Please give hints.

    ReplyDelete
  9. Replies
    1. Yes!

      However, you can replace the diodes d1, d2, d3 with Fast recovery diode.

      Delete
  10. hello is there any way that i van change the frequency of this circuit to 1 ghz ?

    ReplyDelete
    Replies
    1. It could be!

      Replace the transistor with a power MOSFET. However, I am not sure about the output frequency.

      Delete
  11. Can you explain on how does the oscillation is generated?

    ReplyDelete
    Replies
    1. When the power supply to the transistor is switched on initially, electronic noise in the circuit provides a non-zero signal to get oscillations started.

      The noise travels around the loop across the two winding (L1, L2) of the transformer and amplified on a square wave at a single frequency and step-up the input voltage through secondary winding (L3).

      Delete
  12. What will be the current through base of transistor.....

    ReplyDelete
  13. this transformer primary inductance value and winding connection start & end how is the find?
    plz find ?

    ReplyDelete
  14. Can I use it without battery always connected with ac power removing switches and arranging blue LED in it to attract mosquitoes instead of chemical mosquito repellent..

    ReplyDelete
    Replies
    1. No. This is not a good idea, because the output of the charging circuit does not give pure D.C. output so the transistor may be damaged.

      I advise you to use a D.C. 5V 0.5-1A adapter for the direct powering of the mosquito killer bat circuit. Therefore, you need to disconnect the charging circuit and battery from the circuit.

      Delete
  15. If I have to use a 12V dc adaptor, without battery and charging circuit what changes are required in the circuit for continuous stand alone operation

    ReplyDelete
  16. Can we say that it is a type of static convertor?

    ReplyDelete
  17. what is the specification of stepdown transformer

    ReplyDelete
    Replies
    1. All the details are given... read the post carefully and get the answer.

      Delete
  18. Why transformer leakage/Fail again n again in PCB

    ReplyDelete
    Replies
    1. Check the transformer winding (direction, connections, or turns).

      Delete
  19. I have developed mosquito circuit after 15-20 times spark then Transformers are damage pls suggest why fail ..pls tell me solution how to resolve this problem..

    ReplyDelete
  20. pls what is the rating of the transformer use

    ReplyDelete
  21. Charging voltage for the battery is showing more than 200v in mosquito bat..pl explain

    ReplyDelete
    Replies
    1. It's a capacitive power supply system. Without load, the X-rated capacitor wants to reach its highest capacitor voltage with low current (e.g. if you use a 400v voltage dropping capacitor, then it wants to reach 400V in no-load condition). But, when you connect an acid battery or LED light as a load to the output, the voltage comes down according to the load.

      Delete
    2. Hi Sir, meant if i measure 230V (Which i presume is line voltage in Malaysia) with a Battery attached, can i said that the battery is faulty ?
      And there is another unit when i attached the battery, charging voltage is 0

      Delete
  22. GOOD, NICELY EXPLAINED

    ReplyDelete
  23. There is no protections in the circuit (fuse, varistor....)

    ReplyDelete
  24. Mr Berman kya aap se phone per baat ho sakti hai mujhe new circuit design karbana hai my place delhi

    ReplyDelete
  25. Exhaustive explanation .Very systematic .Keep it up Shubhojit.

    ReplyDelete
  26. I suppose the ckt is designed for 4 v lead acid battery .Does it have a overcharge protection incorporated?

    ReplyDelete
  27. Why transistor overheat? Transformer seems ok but no output. When also removed traforrmer, no heating of transistor s882.

    ReplyDelete

If you have any doubts or questions, please let me know. Don't add links as it goes to spam. Share your valuable feedback. Thanks