2 x 50W Bluetooth + DSP Audio Amplifier Board – TSA7802B (Apt-X)
TSA7802B is a 2x50W Bluetooth+DSP amplifier board with an AudioB I2S Bluetooth module that supports Apt-X. It is a very flexible DSP/DAC/Amplifier combination board. It has perfect class-D architecture(Based on TPA3116D2), and two channels have a 50W power output. All the channels are capable of outputting nominal power simultaneously and continuously. Any DC12V-24V power supply can power this board. It can be used to drive any 4Ω or 8Ω passive speakers.
It’s a two-channel amplifier board. You can pair it with a mobile phone or a computer (etc). Power the amplifier board. Use your phone or PC (etc.) to search for a new Bluetooth device. The module will appear as “TSA7802B”. You don’t need a PIN; pair it, and then you can play music.
The highlight point is the ADAU1701 DSP chip on board. It has a default DSP program loaded. Customers can adjust the gain, Bass, midrange, and treble in the DSP program. It also has a debug port for Sigma Studio, and the User can program this module with our USBi programmer to get more functions, which include equalization, crossover, bass enhancement, multiband dynamics processing, delay compensation, etc. TSA7802B has Apt-X and TWS supported. Therefore, users can stream audio to 2 paired amplifier boards wirelessly.
External Buttons port: Three buttons on the board can control the audio volume, play/pause, etc. You can connect external buttons easily by using this button’s control port.
Pins define:(Check the board backside silkscreen):
- P/P: Play pause button
- VOL+: volume increase and forward button
- VOL-: volume decrease and rewind button
- VDD_BT_IO: AudioB I2S 1.8V output
Volume control POT port:
There is an Ext POT port on the board. You can connect external POTs (5K~20K) to control the Main volume, treble, middle, and Bass. You need to update the DSP program first. DSP program (with external POTs). This is our POT kit:
- ADC0- Main volume.
- ADC1- Bass volume.
- ADC2- Middle volume.
- ADC3- treble volume.
DSP programming port: Users can load a new DSP program by using the USBi JTAG Sigma DSP programmer
The default DSP program can auto-select the line-in/Bluetooth audio and output to the amplifier chips. The Bluetooth audio signal has a higher priority.
Two boards work in TWS mode. You can also build a wireless subwoofer system.
- S1 – Long press 3s into pairing mode. Long press 6s to clear the pairing info.
- S1+S2 – Long press 1s into TWS slave mode.
- S1+S3 – Long press 1s into TWS master mode.
- S2+S3 – Long press 1s disconnect TWS connection.
Specifications: Unless otherwise noted, specifications are typical @ +25℃, Powered by 30V DC. Specifications are subject to change without notice.
Parameter | Condition | Min | Typ | Max |
Supply Voltage (VDC) | – | 12 | 21 | 24 |
Power output per channel | RL= 4Ω, 10% THD+N | 50W | ||
RL= 8Ω, 10% THD+N | 30W | |||
RL= 4Ω, 10% THD+N | 18W | |||
THD+N | @4Ω, 1W, 1KHz | 0.03% | ||
Bandwidth @ ±3dB | @4Ω | 20Hz | – | 20KHz |
Input Impedance | – | – | 22KΩ | – |
Minimum Load Impedance | 3.2Ω | |||
Gain | 18dB | 24dB | 34dB | |
Efficiency | 50W @Â 4Ohm | 87% | – | 92% |
Features:
- Size: 10.5cm x 7.5cm x 2.2cm
- aptX, aptX Low Latency, SBC and AAC
- Bluetooth 5.1
- I2S Sampling Rate: 48KHz
- Two channels
- Working voltage: DC12V-24V
- Over/under voltage protection
- Over current protection
- Over temperature protection
Applications:
- Personal computer
- Background music system
- Musical instrument amplifiers
- Home DIY
- Car Audio
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