No matter how far we try to escape from pest’s trap or we attempt to clean the surrounding around us, we get eventually bothered being followed everywhere from kitchen to every corners of our house. Different pest repeller circuits have been developed claiming to escort people through this problem. However, pest repeller circuits thus built are found to have low power output resulting poor effectiveness. And, this error gives no solution to our trouble. With this point as our main concern, we have presented a powerful pest repeller circuit that uses powerful ultrasonic signals to repel pests and guarantees a 100% effective result.
Description of Pest Repeller Circuit
The entire circuit of pest repeller comprises of ultrasonic frequency oscillator, push-pull power amplifier and transformer which aids in further improvement of the ultrasonic signals. Ultrasonic frequency oscillator is built around IC1 (CD4047), which provides complementary outputs. With the help of the transistors T1 and T2 (BD139), these complementary outputs are amplified. And, thus after amplification of complementary outputs, they are used to drive transistorized push-pull power amplifier stage comprising power transistors T3 and T4 (2N3055).
Then through the output transformer X1, the output of power amplifier is coupled to a tweeter. Learners!, the transformer X1 we talked about is wound over ferrite core (UU or CC core. Moving in for further details, primary winding consists of 150 turns of 28 SWG while secondary winding comprises 40 turns of 24 SWG. In the circuit potentiometer VR1 is provided such that we can produce maximum effectiveness with proper adjustment of potentiometer. (And, finally people can sigh, thank god” instead of oh god”)
PARTS LIST OF POWERFUL PEST REPELLER CIRCUIT
|Resistor (all ¼-watt, ± 5% Carbon)|
|R1, R2 = 1 KΩ
VR1 = 47 KΩ
|C1 = 680 pF
C2 = 0.1 µF
|IC1 = CD4047
T1, T2 = BD139
T3, T4 = TIP31C or 2N3055
LS1 = 5W Tweeter
SW1 = ON-OFF Switch
X1 = Audio Transformer (primary 150 turns, 28SWG, centre tapped secondary 40 turns, 24SWG core ferrite ‘U type’)