Sell ✶❂10W/15W/20W DIY Stereo Bluetooth Power Amplifier Board 12V/24V High Power Digital Power Amplifier best price

Description: Potentiometer adjust volume, with switch, easy to control volume, very suitable for DIY speaker. If it is a metal box, the Bluetooth antenna needs to be led out. Copper DC connector is adopted, which can bear large current without heating. Capacitor 470uf35v solid-state capacitor, ensure power storage and heat dissipation capacity, stable and continuous power supply is the premise of good sound quality. Send DC head wire, can be compatible with the product input power interface, even if you do not have DC head adapter or battery, can also be convenient wiring. Bluetooth version 5.0 has higher transmission efficiency and longer transmission distance. Precautions for use: the power switch on the board is the standby switch. After turning off the switch, the machine is in the low-power standby mode. To completely turn off the power or not use it for a long time, you can pull out the DC plug on the machine. Specifications: Question and answer: 1. How to select power supply? The power supply of the board is the key. The higher the voltage, the higher the current, and the more sufficient the output power. If you only have 12V 1a, you can bring a 3-4 inch speaker. If you are above 19v 5a, with 8-10 inch no problem, power must be attached great importance. If the voltage is too low, the sound amplification is easy to cause sound distortion. If the current is too small to bring up, the horn will pull down the voltage, work abnormally or the sound quality becomes poor. It is recommended to use 18v19v2v power supply with current above 3a. If you only have 9v12v or 1A 2A power supply, you can also use it, but the power is small. Pay attention to the maximum volume when using it, which may cause distortion and affect the sound quality. 2. How to choose the horn? Commonly used speakers are generally 8 ohm, can not distinguish between positive and negative polarity, the effect is the same, 4 ohm speakers can also be used. If your speaker power is low, it may be between 10W-30W. The power supply voltage should be lower to prevent burning the speaker after loud. For example, choose a power supply below 15V. If you are a 50w-200w speaker, you don't have to worry about the burning problem of the speaker. You can choose a 12-24 V power supply. The higher the voltage you choose, the more sound or power you can output. 3. How to connect Bluetooth? Power on the power amplifier board, connect the speaker, turn the audio knob, the indicator lights up, turn on the mobile phone settings Bluetooth, search for "bt-wuzhi", and then click Connect. After the connection is successful, there will be a Ding Dong prompt tone. At this time, it is Bluetooth mode, just play music, and the next power on will automatically connect with the mobile phone. 4. It's ok if the sound is small, but when the sound becomes loud, the sound becomes turbid? The sound is distorted. Please replace the adapter with a higher voltage leve