1 x 200W Bluetooth+DSP Mono Audio Amplifier Board - TSA7551B(Apt-X)

1 x 200W Bluetooth+DSP Mono Audio Amplifier Board - TSA7551B(Apt-X)
1 x 200W Bluetooth+DSP Mono Audio Amplifier Board - TSA7551B(Apt-X) 1 x 200W Bluetooth+DSP Mono Audio Amplifier Board - TSA7551B(Apt-X) 1 x 200W Bluetooth+DSP Mono Audio Amplifier Board - TSA7551B(Apt-X) 1 x 200W Bluetooth+DSP Mono Audio Amplifier Board - TSA7551B(Apt-X)
Brand: Tinysine
Product Code: G650A908D0796D
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Availability: 280
Price: $56.95

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TSA7551B 200W Bluetooth+DSP mono amplifier board with an AudioB plus Bluetooth module that supports Apt-X. TSA7551B is a very flexible DSP/Amplifier combination board. It has perfect class-D architecture(Based on TDA7498E) and the mono channel has 200W power output. This board can be powered by any DC14V-39V power supply. It can be used to drive any 3Ω,4Ω or 8Ω passive speakers. TSA7551B has a smart cooling system, the fan not working in normal case to reduce the noise. Only start when the board overheat.

It's a one channel amplifier board. The only channel are 200W mono output(Bluetooth stereo right and left channel audio mixed in the DSP program). 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 "TSA7551B". You don't need a PIN, pair it and then you can play music.

TSA7551B has a 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 Sigima Studio and user can program this module with our USBi programmer to get more functions that include equalization, crossover, bass enhancement, multiband dynamics processing, delay compensation, etc...

TSA7551B are Apt-X and TWS supported. Therefore, Users can stream audio to 2 paired amplifier boards at the same time wirelessly.


Functions TSA7551 TSA7550
Bluetooth output signal Digital -I2S Analog
Bluetooth version BT5.1 BT5.0
Bluetooth USB programming Yes No
External POTs numbers 4 1
External LED port 1 0
SPDIFBee support Yes No
TOSLINKBee support Yes No
Multipoint Bluetooth extension No Yes

Comparison of differences between TSA7551 and TSA7550



External Buttons port:

There have 3 buttons on the board which can control the audio volume and play/pause ect... You can connect external buttons easily by using this buttons 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
  • 1.8V

Potentiometer port:

There have an Ext POT port on the board. You can connect external POTs (5K~20K) to control the Main volume,treble,middle,Bass. You need update the DSP program first. This is our POT kit

  1. ADC0- Main volume.
  2. ADC1- Bass volume.
  3. ADC2- Middle volume.
  4. ADC3- treble volume.


DSP programming port:

User can load a new DSP program by using the USBi JTAG Sigma DSP programmer




2 boards work in TWS mode. You can also build a wireless stereo system.


  • S1 - Long press 3s into pairing mode. Long press 6s 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 typical @ +25℃, Powered by 36V DC, unless otherwise noted. Specifications subject to change without notice.

Parameter Condition Min Typ Max

Supply Voltage (VDC)

- 14 36 39
Power output Parallel BTL (mono) output
power, RL = 3 ohm,THD = 10%
Parallel BTL (mono) output
power, RL = 3 ohm, THD = 1%
THD Po = 1 W   0.05%  
Bandwidth @ ±3dB @4Ω 20Hz - 20KHz
Input Impedance - - 69KΩ -
Undervoltage protection

Minimum Load Impedance



Gain   23.8dB 29.8dB/33.3dB 35.8dB
Efficiency   - 85% -



  • Size: 13.5cm x 9.2cm x 3.5cm
  • aptX, aptX Low Latency, SBC and AAC
  • ADAU DSP integrated
  • Bluetooth 5.1
  • I2S Sampling Rate: 48KHz
  • Mono output
  • Working voltage: DC14V-39V
  • Smart cooling system
  • Over/under voltage protection
  • Over current protection
  • Over temperature protection



  • Personal computer
  • Background music system
  • Musical instrument amplifiers
  • Home DIY
  • Car audio



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