In this article we learn about an easy as well as inexpensive tested mosquito repellent circuit layout. The circuit functions to prevent the mosquitoes from the area or maybe the place in which the unit is fitted.
Based on a number of journals, the frequency released by the male mosquitoes is probably about 20-25 kHz, and thus in the likeness of ultrasound.
However based on some, it really is approximately 5-7 kHz alternatively; frequencies which a human ear, actually an aged one, can also still listen to well.
Instead of wasting big money purchasing this type of device, that additionally commonly possess a fixed frequency, we will recommending developing a single on your own , specifically because the circuit offered really is easy and low-cost to construct.
How this Mosquito Repellent Circuit Works
The low cost mosquito repellent circuit makes use of only a single IC, a CMOS type 4047. This particular extremely multi-purpose IC could be configured in lots of working modules, which includes that of the multivibrator or astable applied in this article.
The working frequency is defined with the external components C1, R1, and P1. The second option assists you to marginally adjust the frequency, offered the hesitation which is out there on getting the most helpful value.
To properly replicate the high frequencies created by the generator, the output transducer employed is an ordinary tweeter, but it ideally should be a piezo one.
This kind of tweeter acts actually a lot like a capacitor, and thus does not necessarily clog the CMOS IC outputs which are not capable of delivering a considerable current.
To acquire an output signal of ample amplitude when being run by a solitary 9 V battery. The tweeter is attached between your 4047’s Q and Q outputs.
With this particular situation, it achievable to use complementary (antiphase) signals towards the tweeter so it ‘sees’ an alternating voltage of dual the supply voltage.
In strictly assumptive conditions, this quadruples the output power available. In fact, it may be preferable to consider it as tripling this, however the beneft accomplished getting into it that way is , however quite genuine.
Everything ends up to be, that you can place the unit in the center of the patio desk or next to your lounger to acquire a flavor of the peaceful of a summer’s night without having mosquitoes disturbing you acoustically or even worse, gnawing at. At the least, that is what all of us wish for you actually who make this.
The tested mosquito repellent prototype is shown below. A transformerless capacitive power supply was used here instead of a battery so that a direct mains operation could be achieved