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What You Need To Know About Bug Zapper Circuit?

As we all know, mosquitos are quite annoying as they always revolve around us for their food. They suck our blood, make us feel itchy, and they fly away for their next target. We all want to get rid of these mosquitos, insecticides are better, but some mosquitos become resistant to them. Now we have to choose some other ways to deal with these idiot mosquitos.

There is another way to kill these mosquitos by using electrocution. It is believed that this method is better as compared to using insecticides. It contains a circuit called bug zapper which helps in killing mosquitos.

A bug zapper circuit attracts different mosquitos and insects, such as flies, by emitting an attractive Uv light. These lights are emitting due to high voltage, which helps in killing insects.

As we all know that the zapper bug is quite convenient for us; similarly, building a bug zapper bag is easy. The information is given below.

What Is A Bug Zapper?

Bug zapper circuit Schematic
Bug zapper circuit Schematic

It is a mosquito, bug, and insects killing machine consisting of a circuit in it. It contains two slim grids, which are electrically charged; due to the high voltage, it emits a Uv light that attracts bugs, mosquitos, and insects towards itself.

On the other hand, this bug zapper circuit is an electrical circuit whose main parts are grids and wires that are wrapped around these grids, which emit light. It controls the mosquitos and bugs around itself by killing them after attracting them.

Bugs are killed by the high voltage current given to them by these grids. We called this circuit bug zapper because it kills bugs, and when it kills, it produces a sound of “zap.” That’s why we call it bug zapper. I know it sounds cruel, but it is better for the humans.

How the Circuit Functions?

Here we have circuit C1 and a resistor R1; they both have different agave frequencies, which help them in vibration.

After it completes the system, we have a transformer with a small core having triple A batteries in it.

When we apply current to these transformers and transistors, they will start working, and at a high frequency, they will start vibrating. 

After some time, the current will start migrating towards other secondary TR1 winding, creating a push-pull manner emitting a high voltage of 200 volts at winding.

To raise the voltage up to 600 volts, we can use a ladder network called Crockcroft-waited at TR1.

By bringing the 2uF capacitors output terminal less distance, it will make the power connection weaker between the capacitors, and that’s what we do not want to happen.

Some moment later, the capacitor will stop working and charge itself for another spark.

We can use this circuit in bug zapper to kill mosquitos and bugs or other insects, but we have to take some points in mind.

  • Attach capacitors of 2uF end with the internal and external mesh bet layers.
  • To prevent this circuit from sparking, we will place capacitors at some distance and attach the mesh bet layers with the frames made up of solid frames.
  • So If a poor mosquito or bug flies near these layers, which are made up of metals and have a very high voltage of current running through them, it will kill poor mosquitos instantly by creating a spark.

Making the Ferrite Core Transformer

During the insufficient power generation, we can modify our bug zapper circuit by making some small changes in its circuits. By connecting it with the 3 Volts battery, we can recharge it and reuse it easily with less energy consumption.

How the Circuit Functions?

It is quite normal that we will use this circuit by pressing the ON button.

After switching it on the high frequencies, vibrations will start with the help of a transformer and transistors. When we use 3 volts battery to charge it, the current will boost to 500V.

Then due to vibration, diodes are setup to 500 Volts to 1500 volts. 

When the 1500 volts reach the grids, it will start attracting mosquitos towards itself.

It causes the LED light to light up so that it will attract bugs. Eventually, due to this attractive light, the mosquitos flew towards it and died due to the high voltage running in the wire, which is wrapped around the grids.

How to Build a Portable Bug Zapper


Every bug zapper is of different sizes and designs and also depends on the type of insects it wants to kill.

Materials required:

  1.       UV LED light and Handsaw,
  2.       Glue gun, 
  3.       Drill and Stapler wire,
  4.       Soldering gun,
  5.       Screws, 
  6.       Plywood,
  7.       A 1-yard squared one by 4 mesh grid,
  8.       Six wooden dowels
  9.       Two garden plant vase dishes,
  10.       A 6V lead-acid cell that we can recharge and 
  11.      The circuitry of an old lantern is rechargeable. 


First, we will build the base of the bug zapper:

We will use two wooden plates of equal sizes as the vase cover of the plant. After that, with the help of the vase plant cover, we will tighten up the wooden plates.

Now we will drill six same holes in base plates. We will do this to strengthen the frame made up of plastic to secure it.

Use hot glue to fix the UV LED bulb around the grind to secure it.

Add some other components, such as black and red wires around the grid, and please make sure that we will avoid any overlapping in it as it will cause any disturbance in the circuit and not work properly.

When we place all the stuff together now, fix them all with some hot shiny glue so that they will not misplace.

How To Troubleshoot A Bug Zapper?

If the LED of the zapper bag is not working, unplug the wire carefully from the switch and re-plug it into another switch; maybe there is an issue with the switch. Just make sure that it is not an issue related to the power supply.

If you see an issue that the bulb is off, but it is still killing the bugs, then unplug the wire, open the bulb, make sure that it is not broken, and then reuse it. Sometimes bulb takes some time to lighten up, just like some people.

To solve the issue of sparking, open the grid, and clean it carefully. It occurs because of some dirt. Use some bristles for its cleaning.

If the bulb is still not working, then there will be an issue with the wires around the grid. Make sure that the wires are fine.


Zapper bag is the best insect-killing tool so far. As we all know that the zapper bug is quite convenient for us; similarly, building a bug zapper bag is easy. It is also easy to use and affordable. It kills almost all annoying insects in the room.

But on the other hand, there is a disadvantage that it will use electricity which may result in high electricity bills, which is an alarming fact for us. Also, it is harmful to kids as it emits light which may attract children and harm them.

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