1 x 200W Bluetooth+DSP Mono Audio Amplifier Board – TSA7551B (Apt-X)
TSA7551B is a 200W Bluetooth+DSP mono amplifier board with an AudioB plus Bluetooth module supporting Apt-X. TSA7551B is a very flexible DSP/Amplifier combination board. It has perfect class-D architecture(Based on TDA7498E) with a mono channel capable of a 200W power output. Any DC14V-39V power supply can power this board. It can be used to drive any 3Ω,4Ω, or 8Ω passive speakers. TSA7551B has a smart cooling system, but the fan is not working normally to reduce the noise. Only start when the board overheats.
It’s a one-channel amplifier board. The only channels 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 an 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, including equalization, crossover, bass enhancement, multiband dynamics processing, delay compensation, etc.
TSA7551B is Apt-X and TWS supported. Therefore, Users can wirelessly stream audio to 2 paired amplifier boards simultaneously.
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 Button port:
Three buttons on the board can control the audio volume, play/pause, etc. These button control ports allow you to connect external buttons easily.
Pins definition: (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 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. 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 using the USBi JTAG Sigma DSP programmer.
Two boards work in TWS mode. You can also build a wireless stereo 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 at +25℃, powered by 39V DC, and are 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% |
220W | ||
Parallel BTL (mono) output power, RL = 3 ohm, THD = 1% |
170W | |||
THD | Po = 1 W | 0.05% | ||
Bandwidth @ ±3dB | @4Ω | 20Hz | – | 20KHz |
Input Impedance | – | – | 69KΩ | – |
Undervoltage protection threshold |
8V | |||
Minimum Load Impedance | 3Ω | |||
Gain | 23.8dB | 29.8dB/33.3dB | 35.8dB | |
Efficiency | – | 85% | – |
Features
- Size: 13.5cm x 9.2cm x 3.5cm
- TWS firmware: aptX, aptX-HD, SBC and AAC
- Party mode firmware: SBC
- 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
Applications
- Personal computer
- Background music system
- Musical instrument amplifiers
- Home DIY
- Car Audio
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