Traditional Chinese Eight types of hearing aid circuits: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Eight types of hearing aid circuits: Circuit Design, Parts List & Workshop Prototype Guide (Circuit). This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 3378 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Eight types of hearing aid circuitsA hearing aid is actually an ultra-small amplifier, which consists of three parts: a transmitter (microphone), an amplifier, and a receiver (earphones or bone conductors). The sound is converted by the microphone into a weak electrical signal, which is amplified by an amplifier and sent to the earphones (or bone conductor), where it is converted into a stronger sound and transmitted to the ear.Figure 99-1 to Figure 99-8 show the circuit schematics of eight types of hearing aids produced by domestic and foreign manufacturers. Among them, the 1st position of the switch S in Figure 99-2 is off, the 2nd position is for general hearing aids, and the 3rd position is for telephone hearing aids. It can be seen from the comprehensive analysis that they have many things in common and at the same time each has its own characteristics. alt="148.jpg (42245 bytes)">Figure 99-1 …
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