Through the analysis and research on the problems in the students' electronic training class, I invented the all-round stereo capacitor sensor, which solves the problem that the traditional sensor can only be sensed in a single direction and realizes the purpose of the all-dimensional stereo sensor.
First, found the problemWhen the touch switch assembly and debugging training is carried out in the electronic class, when the touch panel is connected to the outer casing of the desktop computer, the bulb is replaced with an alarm device, and it is converted into a desktop computer alarm device. However, the person does not touch the outer casing of the desktop computer, and the alarm is always ringing. Why is this so? I suspect that it is the reason for the computer grounding. I put the computer on the table, unplugged the power cord, and the alarm is still ringing.
Second, analyze the problemConnecting the touchpad to the desktop of the desktop computer is nothing more than making the touchpad bigger. Why can't the touchpad be enlarged? First let us touch the antenna of FM radio. We found that the sound of FM radio with a lot of noise has become clear. The reason why the FM radio becomes clear is that the signal of the receiving end of the FM radio antenna becomes stronger due to the distributed capacitance of the human body. The sound of the FM radio becomes clear.
By the same token, the touchpad becomes larger, its distributed capacitance also becomes larger, and the signal becomes stronger. The base voltage of the triode connected to the touchpad also becomes larger, causing the triode to be in a saturated conduction state, resulting in a single The thyristor is turned on, and the alarm is energized to give an alarm sound. Since it is a capacitor, which is the other pole? The other pole is ground. In the FM radio signal transmission process, the transmitting antenna is equivalent to an inductor. The sky and the earth are the two poles of the capacitor, forming an LC oscillating circuit, and the signal propagates between the heavens and the earth.
Third, solve the problemCan you invent a full-scale stereo capacitance sensor with reference to this principle and circuit? When the high voltage is tested, should the electroscope be in contact with high voltage? The answer is: no.
At this time, I understand that as long as the touchpad is adjusted to a suitable size, when the human body approaches a certain distance, the base voltage of the triode connected to the touchpad is sufficiently large to make the triode in a saturated conduction state, one-way. The thyristor is in the on state, and the circuit or device controlled by the thyristor will work. At this time, we can use it to control circuits or devices such as sound, alarm, and lighting.
Fourth, the working principleUsing the LC principle, the wire connecting the base of the triode to the thermos is equivalent to the inductance L. The thermos and the ground are the two poles of the capacitor C. The person is equivalent to the medium in the capacitor, which is equivalent to the capacitor when approaching the housing of the thermos. As the medium increases, the capacity of the capacitor C increases, and the inductance of the inductor L increases. When the amount is increased to a certain amount, the base voltage of the triode connected to the touchpad is sufficiently large to make the triode in a saturated conduction state. The silicon control is on, and the circuit or device controlled by the thyristor will work. At this time, we can use it to control circuits, devices such as sounds, alarms, and lights.
V. SummaryThis design solves the problem that the traditional sensor can only be sensed in a single direction, and achieves the purpose of all-dimensional stereo sensing. By consulting relevant literature, no other person carries out the physical circuit research with the design of Fig. 1. Figure 1 shows the physical circuit of the design.
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