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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 (40:450).
When this circuit is run by giving input of 3 Volts, the transformer generates about 2000-4000 volts at zero load, and the output is then coupled 3 times by using three IN4007 diodes and suitable capacitors, thus reaching our need of 5000-10,000 volts.
The moment a mosquito or any bug comes in contact with the meshes, the
stored high voltage in the capacitor discharges violently through the
body of the entangled bug creating a big spark and electrocuting it