Cheap hearing aid ----- Audiphones

Keywords: cheap hearing aid Cheap hearing aid This compact hearing aid consists of a stereo predecessor amplifier and a headphone amplifier and powered by a 3V lithium button battery. The output power of this hearing aid at 1 kHz is about 8 mW, which is already sufficient for those with low hearing disorders. Figure 1 is a hearing aid circuit. LA4357M is a double-column-in-line packaging of 10-pin, and its internal function is shown in Figure 2 (omitted). Two La4357M chips are connected to the stage, which makes the total sensitivity increase. To increase the reception distance of the sound. The volume of the two channels can be adjusted independently in accordance with the required potentiometers VR1 and VR2. S2 is a silent switch. After assembling the main circuit, put it in the thin shell metal box. The intermediate portion of the metal or plastic earphone head ring (the type of the attendant used) is then reloaded. Two microphones MIC1 and MIC2 and two headphones EP1 and EP2 extends with shielding lines. Enables microphone / headphone components to the corresponding earlobe. Note: The shielded microphone line cannot be in contact with the shielded earphone cable. Short-circuit is caused because their outer skin is connected to the different pins of IC1 (input foot 5 and grounding feet 8), otherwise short circuits. Therefore, two shield lines can be protected by insulating sleeve separately.

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