There is set of recommendations how to be protected from aggressive dog. Experienced dog handlers can give advice as it is better to grasp the dog who has snatched on you and where to strike. But for such repulse it is necessary to possess considerable physical training. Those who has no fighting skills, but nevertheless wants to protect himself, will approach repellant more.
Instruction
1. The repellant of dogs can be characterized as gun which shoots ultrasonic signal. Signal height such is that the human ear does not perceive it, but the gone too far dog retires, having put the tail between the legs. Modern repellants for dogs have the small sizes so it with ease can be carried in trouser pocket or coat. If you know that you should pass unsuccessful stretch of road, for example, the waste ground where stray dogs like to trade, include repellant in advance, and any pack will not approach you.
2. The simplest option of repellant gathers on one chip and five transistors. In turn, the infrasonic generator is executed on logical elements, resistors and condensers. It is the symmetric multivibrator which forms impulses with a frequency of 1.5 Hz. The second symmetric multivibrator is the supersonic generator which frequency of impulses fluctuates within 20 kHz, and periodically amplifies four times. Periodic increase in frequency provides the knot consisting of resistors, the condenser, the transistor and diodes.
3. The ultrasonic fluctuations formed on the weekend chip conclusions have small power. Therefore they amplify the duple bridge amplifier made on transistors. As emitter loading for this purpose amplifiers there has to be piesoceramic emitter. Ultrasonic fluctuations have to join after pressing the button which is the power switch. Supply circuits of chip have to be protected from accidental polarity reversal of the battery by the diode.
4. The main control of repellant of dogs consists mainly in selection of resistance of resistors. Operation of the device can be controlled aurally.