Sell ✘ZK 502L Amp MINI Bluetooth 5.0 Wireless Audio Digital Power amplifier Stereo Board 50Wx2 Bluetooth best price

ZK-502L Amp MINI Bluetooth 5.0 Wireless Audio Digital Power Amplifier Stereo Board 50Wx2 Bluetooth Amplificador Mini version 20W30W40W50WX2 Bluetooth 5.0 digital power amplifier board knob to adjust the volume with switch DIY Mini version 50Wx2 Bluetooth digital power amplifier board (knob adjustment volume with switch) Note! The outer casing is a material package, which needs to be purchased separately. It needs to be assembled by itself, and the material package is given a screwdriver. The potentiometer adjusts the volume with a switch for easy control of the volume, making it ideal for DIY speakers.If it is a metal box, you need to bring out the Bluetooth antenna. The copper DC connector is used to withstand high current and no heat. Capacitor 470uf35V solid capacitors ensure power storage and heat dissipation, and stable power supply is a prerequisite for good sound quality. Free DC head lead, compatible with the input power interface of this product, even if you don't have a DC head adapter or battery, it can be easily wired. 5.0 Bluetooth version, the transmission efficiency is higher, the transmission distance is farther. Precautions for use: The power switch on the board is the standby switch. After the switch is turned off, the machine is in a low-power standby state. To completely turn off the power or unplug the DC plug on the machine for a long time. Question and answer: 1. How to choose a power supply? The power supply with the board is critical. The higher the voltage, the higher the current and the better the output power. If you only have 12V 1A, you can bring a 3-4 inch speaker. If you are 19V 5A or above, there is no problem with 8-10 inches, and the power supply must be highly valued. If the voltage is too low, the sound will be distorted after the sound is amplified. If the current is too small, the speaker will pull the voltage low, work abnormally or the sound quality will deteriorate. It is recommended to use 18V19V24V power supply with current above 3A. If you only have 9V12V or 1A 2A power supply, it can also be used but the power is small. Please pay attention to the maximum volume when using it, which may affect the sound quality. 2. How to choose a speaker? Commonly used speakers are generally 8 ohms, can not distinguish between positive and negative, the effect is the same, 4 ohm speakers can also be used. Precautions: *** "Pre-sale" ***The products are shipped abroad, and the logistics time limit is generally about 15 days. If you mind, please don't place an order &&&Pre-sale products as long as they are shipped overseas, please do not refuse to sign at will, thank you very much for your understanding! Please pay attention to the store coupons and receive them before placing an order!