Voice / Music Activated LED Light Emitting Glasses Making Kit Light-emitting Flashing Diode Light DIY Electronic Soldering Assembly Kit $29.95/ea. Free Shipping PLEASE READ BEFORE ORDERING!!!! The products which are suitable for electronic enthusiasts to study and repair circuits. We only guarantee that the products are in good condition before delivery, and cannot guarantee 100% success after installation. The installation of the circuit requires the buyer to have experience in the circuit, please read the product description carefully before payment. We do not accept disputes caused by the failure to work properly due to installation errors. In this case, we will blacklist and complain to the buyer. Battery not include in the package !since air transportation does not allow products to contain batteries, if there are batteries, the package will be destroyed. All products will not contain any batteries! Features: Product name: Voice-activated LED light-emitting glasses kit Power supply mode: 2 23A batteries (not included) Item model number: AS123 Working voltage: 12V Shipping Method: Shipped in bulk Working current: 15mA Shell material: transparent ABS Number of lamp beads: 50 Product net weight: 70g Luminous color: red, emerald green, yellow Circuit Description: KA2284 is an integrated circuit used for 5-point LED level indication, inputting different voltages, it can output 5 LEDs with different lighting states, and the LEDs turn on and off sequentially. The number of LEDs lit is often used to indicate the power amplifier output or the level of ambient sound, that is, the louder the sound, the more LEDs are lit, and the smaller the sound, the fewer LEDs are lit. This circuit consists of two parts: a triode amplifier circuit and a level indicator circuit. The microphone sends the received sound to the triode Q1 through C3 for amplification and then sends it to the signal input terminal (pin 8) of the KA2284. The KA2284 drives 5 groups of light-emitting diodes to display on and off . The power supply of the circuit is 12V, R1-R5 are the current limiting resistors of the light-emitting diodes, and every 5 light-emitting diodes are connected in series. The left and right sides of the glasses are 5 groups of light-emitting diodes corresponding to mirror images. Adjust the RP1 to adjust the sound sensing sensitivity. 30 dys money back guarantee. Returned items must be in original condition and packaging. Buyer pays return shipping. No refunds issued unless items are returned.