According to what is said, the bugs are the female insects (mosquitoes, muriçocas and others). Females, on the other hand, cannot stand competition, moving away from the place where other females exist. Thus, according to manufacturers of electronic insect repellents, it is enough to emit a noise that resembles the humming of the female so that they are removed and thus do not sting people. It is clear that the system has its efficiency questioned if we take into account that there may be “deaf” insects and that not always the females that cause problems care about the noise ... Of course, if the reader wants to try the circuit, which is based on commercial versions, sold in sporting goods stores, the circuit is shown in the figure. The circuit has low consumption, so batteries or batteries will have great durability. The transducer is a high impedance piezoelectric type. P1 makes the frequency adjustment which, of course, must be done experimentally. If the circuit produces very loud sounds, a resistor from 10 k ohms to 100 k ohms can be connected in series with the piezoelectric transducer. The set can be installed in a small plastic box.
