1 x 200W Bluetooth+DSP Mono Audio Amplifier Board – TSA7550B(Apt-X)
TSA7550B is a 200W Bluetooth+DSP mono amplifier board with an AudioB plus Bluetooth module supporting Apt-X. TSA7550B 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. TSA7550B has a smart cooling system, and the fan does not work in normal cases to reduce the noise. The fan starts only when the board overheats.
It’s a one-channel amplifier board. The only channel is 200W mono output (mixed audio for the right and left channels). 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 “TSA7550B.” You don’t need a PIN. Pair it, and then you can play music.
The highlight point is the ADAU1701 DSP chip on board. Users can set the audio tones/frequency of the output. The board has the default DSP program loaded. Users can set the amplifier to full frequency or low pass output via switch port. TSA7550B are Apt-X and TWS supported. Therefore, users can stream audio to 2 paired amplifier boards wirelessly.

External Button port:
Three buttons on the board can control the audio volume, play/pause, etc. Using these button control ports, external buttons can be easily connected.
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

Switch Port:
- Open: Low-frequency output
- Close: Full frequency output
- Users can also define this port function by changing the DSP program.
POT Port:
Users can connect an external 10K potentiometer to control the audio 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 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
Specifications typical @ +25℃, Powered by 36V DC, unless otherwise noted. Specifications 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: 14.3cm x 9.2cm x 2.8cm
- aptX, aptX Low Latency, SBC and AAC
- Bluetooth 5.0
- 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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