This circuit is very much easy to understand and use. A circuit with minimum components repel mosquito Large number of things like coils, creams, oils is
available in the market to repel mosquito. At the same time all these replant is also harmful for the humans too. Oils and creams can led to skin disease, while coils or mats produces toxic fumes which can lead to breathing problem. While in this circuit there is no harm for human being as it produces frequency which human being can not hear. Mosquito repellent generates a frequency ranges from 20-38 KHz. And mosquito runs away from your house as they irritates from these range of frequency.
Human
generations are able to hear frequency which has a range from 20Hz to 20 KHz.
All the rest frequency above this is considered as a ultrasonic frequency. Many
animals and insects are able to hear this range of frequency. Usually in
mosquitoes ultra sound is generated by the male ones and female one receives
that one. While after breeding female mosquito mainly used to avoid this
frequency. And this circuit produces the same frequency as the male one generates,
and these creates a stress on the antennae of the mosquito and these keep them
away.
Basic
principal of this circuit is to connect a such type of buzzer which can produce
ultrasonic frequency range. With the help of oscillator in the circuit, buzzer
is driven. And in the circuit oscillation is generated by 555 timer which is
linked as a astablemultivibrator.
The
circuit is connected in the closed mode and thus power is received by the 555
timer. In the starting stage voltage in the capacitor is zero volts. So the
voltage at the threshold `as well trigger pin is at zero volts. Now the
capacitor starts charging via a resistor R1 and R2.There will be one point when
the voltage of capacitor will be higher as compared to threshold voltage. At
this stage capacitor starts discharging with the help of resistor R2, which is
a discharging pin and it keeps of going downward till it reaches to its
original state. Thus the signal at the output pin of IC will be an oscillating
signal having 38 KHz frequency. With the help of pin 3 of IC which is out pin
of IC 38 KHz frequency drives to 38 KHzpiezo buzzer. This buzzer will produce a
ultrasound at a regular interval. By altering the value of resistor R2 we can
alter the output frequency.
By
changing the value of resistor and capacitor, it can also use as an insect
replier as insects are also able to hear ultrasound.
From
the source ultrasound are transportable only at 45 degree. So in the situation
when there is any hurdles in the track signals get diverted. Also it works on
the place where population of mosquito are not much more.
Component
Description-
IC
(IC1)
NE555
Capacitor
(C1, C2) 0.01uF
Resistor
R1 760E
R2 1.5K
PiezoBuzzer(B1)
38KHz
Circuit Diagram:
555 is a very commonly used IC for generating accurate
timing pulses. It is an 8pin timer IC and has mainly two modes of operation:
monostable and astable. In monostable mode time delay of the pulses can be
precisely controlled by an external resistor and a capacitor...
The piezo
buzzer produces sound based on reverse of the piezoelectric
effect. The generation of pressure variation or...
Capacitor is a passive component used to store charge.
The charge (q) stored in a capacitor is the product of its capacitance (C)
value and the voltage (V) applied to it. Capacitors offer infinite reactance to
zero frequency so they are used for blocking DC components or bypassing the AC
signals. The capacitor...
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