The reading pen can produce relevant sounds by clicking and pressing on different parts of the book, or by clicking on the same place to read and produce sound; It can play relevant Chinese information, read English, read stories, sing nursery rhymes, etc. Do you know the working principle of the reading pen coil?
The working principle of the dot reading pen coil is that there is a magnetic ring outside the core of the dot reading pen, and there is an inductive coil outside the magnetic ring. When the reading pen coil is under pressure, it drives the magnetic ring to move, and the relative position between the magnetic ring and the inductance coil moves. At this time, the inductance of the reading pen coil will also change accordingly. Then, the inductance change is converted into a square wave (sine wave converted into square wave) oscillation frequency change through an oscillation circuit, so detecting the frequency change can obtain the pressure change. Then, based on the user's selection, select the pre stored sound files from the memory of the reading pen and release the sound through the speaker.
The self induced electromotive force in the reading pen coil always competes with the current changes in the coil. The reading pen coil has a blocking effect on AC current. The reading pen coil is used in various RF circuits, including filters, oscillators, etc.
The dot reading pen coil can form an LC tuning circuit by connecting inductors and capacitors in parallel. If the natural oscillation frequency F0 of the circuit is equal to the frequency F of the non AC signal, then the inductance and capacitance of the circuit are also equal, so electromagnetic energy oscillates back and forth in the inductance and capacitance, which is the resonance phenomenon of LC circuit. When the inductance and capacitance of a resonant circuit are equal in magnitude and opposite in direction, the inductance of the total circuit current is minimized and the current is maximized. IC resonant circuit has frequency selection function, which can select AC signals with a certain frequency F.
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