Feature

●TPA3116D2 HIFI chip solution: stereo dual-channel output, 50W+50W+100W, to ensure continuous serial high-power operation, THD ≤0.1%. Using high-quality filter inductors, the sound is full and clear.
●Bluetooth and AUX audio input: Bluetooth 5.0 version, higher transmission efficiency and longer distance. If your playback device does not have Bluetooth, you can also input audio signals through the 3.5MM jack;
●Safety protection: The power amplifier board has overheat protection, reverse connection protection, circuit breaker protection, overvoltage and undervoltage protection; wide voltage input DC: 12-24V.
●Features copper DC connectors and barrier terminals. It can withstand high current, does not generate heat, and does not damage the wire. The free DC head lead is compatible with the input power interface of this product, even if you dont have a DC head adapter, you can easily wire it.
●Independent high and low bass control knobs, easy to adjust the volume, allowing you to experience theater-like sound effects. With its excellent performance and comprehensive cost performance, TDA3116D2 is widely used in home theaters, square speakers, etc.


Description

ZK-TB21 Bluetooth Amplifier Board
Input Voltage: DC 12V-24V
Max Power Output: 50W*2（R&L）+100W（Subwoofer）
Input Method: Bluetooth & AUX
Channel: 2.1 CH Stereo Output
Output Impedance：4-8Ω
Bluetooth Version：BT 5.0
Protection Functions: Reverse Connection Protection Short Circuit Protection Self-recovery Overheat Protection
Size: 120*100*22mm
Weight: 195g

NOTE:
Only when the audio input is sufficient and the power supply voltage/current input is sufficient, can there be enough power output.
The higher the power supply voltage, the greater the output power;
The smaller the impedance of the speaker, the greater the output power. It is recommended to use a 4Ω speaker.
Finally, please make sure that the power of the adapted power supply is greater than the actual working power of the AMP to ensure the maximum output power.

Warm Reminder:
The power switch on the board is a 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 it for a long time, you can unplug the DC plug on the machine. Properly increasing the voltage or reducing the speaker impedance can effectively increase the output power.

Packing Include:
ZK-TB21 Power Amplifier Board * 1
Protective Shell * 1 Set
DC Plug * 1
Screwdriver * 1
Knob * 5