FM Radio DIY Electronics Kit Bluetooth 50-Compatible Speaker with Voice-activated Level Indicator DIY Electronics Kit FM Radio DIY Electronics Kit Bluetooth 5.0-Compatible Speaker with Voice-activated Level Indicator DIY Electronics Kit Features: 1. Two-in-one audio experience: high-quality speakers + FṂ function, easy to connect to the phone, enjoy music 2. Convenient FM frequency modulation function: automatic search and memory channels, power failure to resume playback, convenient entertainment 3. Colorful LED music lighting effect: 12 LEDs flash with the music, digital display shows mode, volume and frequency 4. Multi-function remote control operation: equipped with a remote control to adjust the volume, mode, channel, DIY assembly fun 5. Powerful Bluetooth and output: Wireless Bluetooth, USB/SD card playback, high-power output, external speakers are more shocking Product parameters: Product name: Bluetooth 5.0 speaker with voice-controlled level indicator (split parts) Working voltage: DC5V (can be powered by 5V1.5-2.1AUSB charger) Working current: recommended. 2A or above Main functions: Bluetooth 5.0 reception, USB, SD card, FM radio playback, voice call, AUX input Output power: 2.0 dual-channel 3WX2 Rated power: 5W Frequency response: 4KHz Total harmonic distortion: 3% Signal-to-noise ratio: 3dB Rated impedance: 3Ω Description: Bluetooth name: JQ-BT, turn on the mobile phone or tablet Bluetooth search and pair to connect. FM radio needs to add an antenna. You can find a suitable wire to solder to the antenna solder point and coil it in the case to increase the sensitivity of the radio. The level indicator light is composed of four LM358 main control chips and 12 LEDs. The sensitivity is adjustable and requires manual welding. After welding, take 5V power from the Bluetooth board to work. When there is a music signal, the LED light flashes from the middle to both sides. Welding method and precautions: The acrylic shell has a protective film. Tear off the protective film before assembly, and figure out the position of each board, then install the speaker and circuit board, and finally assemble. The adjustable resistor for adjusting the sensitivity is welded on the back of the PCB and exposed after the shell is installed, so that the sensitivity can be adjusted at any time. The components should be welded from short to high, and pay attention to distinguishing the positive and negative poles. The polarity of electrolytic capacitors and light-emitting diodes: the long leg is the positive pole and the short leg is the negative pole. After welding, check whether there is a cold solder joint or short circuit, and then power on the test after confirmation. The positive and negative poles of the power supply must not be connected in reverse, otherwise the chip will burn out when the power is turned on. Package list: Bluetooth speaker parts x1 _x000D_