DIY Electronic Kit Set Hearing Aid Audio Amplification Amplifier Practice Teaching Competition Electronic DIY Interest Making _x000D_ _x000D_ _x000D_ Features: 1.The hearing aid kit can receive sound from the surrounding environment and play it in real-time on the headphones 2.Although the sound emitted by headphones is small, it is loud when placed in the ear, so it is very practical for people with certain hearing impairments 3.The kit consists of a microphone, front low amplifier, power amplifier circuit, and headphone jack, which has the characteristic of high sound reception sensitivity 4.Easy to make, low cost, and also an ideal foundation kit for learning analog circuits 5.The kit can be used for practical training in electronic technology foundation and skills teaching, electronic skills teaching, electronic process teaching, digital circuit teaching, and practical training for electronic enthusiasts and beginners to enhance comprehensive practical abilities _x000D_ Parameter: Welding and component installation are the key to success. Please use high-quality soldering tin, with bright solder joints and no missing solder. Do not install components incorrectly, and follow a certain sequence during production. After installing one part of the components, install another part. Start installing low components, such as resistors, and then install high components. _x000D_ 1. Installing resistors: Resistors do not differentiate between positive and negative poles 2. Installing ceramic capacitors: Ceramic capacitors do not have positive or negative electrodes 3. Install the battery shrapnel, paying attention to the opening of the shrapnel facing outward (so that the battery can be installed), and finally install the battery 4. Install the headphone holder and toggle switch (toggle switch does not need to be directional) 5. Install an electrolytic capacitor, with the long leg of the capacitor being the positive pole 6. Install the 104 potentiometer and transistor 7. Install an electret microphone with the negative pin connected to the casing After installation, check again if the components are installed incorrectly and if they are well soldered. Then install the battery with the positive electrode facing upwards, insert the headphones, turn on the switch, adjust the potentiometer while listening to the sound. _x000D_ Package include: Hearing aid kit X1 _x000D_ _x000D_ _x000D_