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Circuit Operation The deaf hearing aid circuit consists of a microphone BM, a volume potentiometer RP and a two-stage amplifier circuit, as shown in Figure 9-77. 
The first-stage amplifying circuit is composed of an operational amplifier IC (N1 in N1 and N2, a resistor R5, and a capacitor Cl-C3. The second-stage amplifying circuit is composed of N2 inside the IC and resistors R6 and R7, and capacitors C4 and C5. composition.
After the sound signal is picked up by the microphone BM and converted into an electric signal, it is added from the 2 pin of the IC via Cl and R4, amplified by the operational amplifier N1 (the amplification gain is about 100 times), and then output from the 1 pin, and then through C3, RP, C4. And R6 is input from the 13-pin of the IC, and further amplified by the operational amplifier NZ (the amplification gain is 500 times), and the sound is restored by the external earphone.
Component selection
Rl-R7 uses 1/4W carbon film resistors.
The RP uses a miniature synthetic carbon film potentiometer with a switch.
Cl uses polyester capacitors or monolithic capacitors; C2-C6 selects aluminum electrolytic capacitors with a withstand voltage of 16V.
IC selects LM324 type four op amp integrated circuit.
The BM uses a high sensitivity electret microphone.
The Apple Airtag TPU Film can perfectly fit your AirTag skin. It is designed to provide the maximum coverage for your AirTag metal panels. Compatible with most AirTag shells. Leave extra space around the frame so that your shell can wrap the edges of the AirTag without interfering with the film.
The 0.14mm ultra-thin AirTag Screen Protector allows you to enjoy the maximum resolution while being thin enough to make the AirTag sensitive to the original signal response, ensuring that it will not affect any user experience. You won't even notice that the screen protector is there, so your Apple logo can still be displayed.
The AirTag Tracker Screen Protector is very easy to apply and is specially designed for your AirTag. Just clean your AirTag and install it on the surface to eliminate all bubbles and get the job done!