Mini 50Wx2 HiFi Power Amplifier Bluetooth Stereo Amplifier Board without Shell Assembled ZK-502L

Mini 50Wx2 HiFi Power Amplifier Bluetooth Stereo Amplifier Board without Shell Assembled ZK-502L

Features:
- With a switch, volume potentiometer is for easy volume control, which is very suitable for DIY speakers.
- If you use a metal housing, you need to pull out its Bluetooth antenna.
- Copper DC connector withstands large current, generating no heat.
- 470uf35V solid capacitors guarantee power storage and cooling capacity, and stable and continuous power supply is the prerequisite for good sound quality.
- 5.0 Bluetooth has higher transmission efficiency and longer transmission distance.



Package Included:
- 1 x Power Amplifier Board

Note:
- It is assembled and ready to use.
- Shell and cable are not included in the package. Please purchase separately.
- Power supply is not included. It needs external power supply. Laptop power supply can be applied to it.

Attention:
The power switch on the board is a standby switch. When the switch is turned off, it is in low-power standby state. To turn off power or do not use the board for a long time, you can unplug DC plug from the machine.

FAQ:
1.How to choose power supply?
Your power supply to the board is critical. The higher the voltage, the greater the current and the more output power. If you only have a 12V 1A power supply, you can use it with 3-4 inch speakers. If your power supply is above 19V 5A, you can drive 8-10 inch speakers. When the voltage is too low, it is easy to cause sound distortion after the sound is amplified. If the current is too small, the board cannot drive your speakers, which will pull the voltage down. At this time, the board is not working properly or the sound quality is degraded.

It is recommended to use 18V, 19V, 24V power supply with current above 3A. If you only have 9V, 12V or 1A, 2A power supply, you can use it, but the power is low. Pay attention to the maximum volume of the board when using it, which may cause distortion and affect the sound quality.

2.How to choose loudspeakers?
The commonly used speakers are generally 8 ohms, and there is no difference between positive and negative polarity. The amplifier board fits 4 ohm speakers. If your speaker power is low, it can also be used between 10W-30W. Power supply voltage is lower to prevent speakers from being burned after the sound is amplified. For example, choose a power supply below 15V. If you use a 50W-200w speaker, you don't need to worry about the speaker burning out, you can choose a 12-24V power supply. The higher the voltage, the greater the sound or power output.

3.How to select Bluetooth or AUX audio input mode?
Power on the amplifier board, connect to speakers, turn the audio knob, and blue indicator light is on. Open Phone Settings-Bluetooth-Search for BT-WUZHI, then click Connect. After the connection is successful, there will be a prompt sound. At this time, it is in Bluetooth mode, and you can play music. The next time it turns on, the board will automatically reconnect with the phone.

If you want to use AUX audio input, you can disconnect Bluetooth and there will be a sound prompt. Then plug in your audio cable to play music. In AUX (LINE IN) mode, connect to Bluetooth, the power amplifier board will automatically switch to Bluetooth mode.

4.When the sound is small, the board works normally. After the sound becomes loud, the sound becomes muddy?
If the sound is distorted, please change power adapter with a higher voltage.

5.When the sound is small, the board works normally. After the sound becomes loud, the sound pauses suddenly?
Input power is insufficient, resulting in intermittent power failure protection of the power supply itself. Replace with a more powerful power supply. Or because the power is too large, the board is heating up seriously, and thermal protection has occurred. Please reduce the power or strengthen heat dissipation condition.