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Electronics Ciruits : Mosquito repellent circuit

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Electronic mosquito repellent schematic circuit This  electronic mosquito repellent schematic circuit  diagram based on the  555 timer IC  is a simple and useful  mosquito repellent circuit  . This mosquito repeller circuit generate an ultrasonic sound with a high output frequency that  allows spreading mosquitoes within a wide radius . The circuit is quite simple and require few external components . The oscillation frequency is given by the value of the R1, R2 and C1 components and can be modified changing the value of components or replacing the R2 fixed resistor with a variable resistor ( potentiometer ) . The actual oscillation frequency of this electronic mosquito repeller circuit is around 45 KHz ( 46.5 KHz) so you need to use a good high frequency speaker , you can use a piezo speaker . The circuit can be supplied from a 9 V DC power supply  . This repeller circuit can be used for almost any animal , it works on  : cats , dogs ,...
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Biomedical Engineering Blogs Series " Defibrillators "

  Defibrillators are medical devices used to treat life-threatening cardiac arrhythmias, specifically ventricular fibrillation and pulseless ventricular tachycardia. These conditions can lead to sudden cardiac arrest, where the heart quivers or beats irregularly, preventing it from effectively pumping blood to the body. Defibrillators work by delivering an electric shock to the heart, which can help restore a normal heart rhythm. There are two main types of defibrillators: Automated External Defibrillators (AEDs): AEDs are portable devices that can be used by non-medical personnel, such as bystanders or first responders, to provide rapid assistance in cases of sudden cardiac arrest. They are designed to be user-friendly and often come with voice prompts to guide the operator through the process. AEDs analyze the heart's rhythm and, if necessary, deliver a shock to restore a normal heartbeat. Manual Defibrillators: These are more advanced defibrillators typically used by healthca...
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What Is Ultrasound

What Is Ultrasound An  ultrasound scan , also referred to as a sonogram ,  diagnostic sonography , and ultrasonography , is a device that uses high frequency sound waves to create an image of some part of the inside of the body, such as the stomach, liver, heart, tendons, muscles, joints and blood vessels. Experts say that as sound waves, rather than radiation are used, ultrasound scans are safe. Obstetric sonography is frequently used to check the baby in the womb. Ultrasound scans are used to detect problems in the liver, heart, kidney or the abdomen. They may also be useful in helping the surgeon when carrying out some types of biopsies. The word "ultrasound", in physics, refers to all sound with a frequency humans cannot hear. In diagnostic sonography, the ultrasound is usually between 2 and 18 MHz. Higher frequencies provide better quality images, but are more readily absorbed by the skin and other tissue, so they cannot penetrate as deeply as lower fre...
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