4 x 50W Bluetooth+DSP Amplifier Board – TSA7804B(Apt-X)

Description

TSA7804B 4x50W is a 4 channels Bluetooth + DSP amplifier board with an AudioB I2S Bluetooth module that supports Apt-X. TSA7804B is a very flexible DSP/DAC combined amplifier board. It has a perfect class-D architecture (based on TPA3116D2) and 4 channels have 50W power output.

All the channels are capable of outputting nominal power simultaneously and continuously. This board can be powered by any DC 12V-24V power supply. It can be used to drive any 4Ω or 8Ω passive speakers. Power input port can be power jack or screw terminal. The DC input jack is 2.5mm with positive core polarity, and if you use the screw terminal, you must pay attention on the polarity!

You can pair it with a mobile phone or a computer.

• Simply power up the amplifier boar
• use your phone or PC to search for a new Bluetooth device
• the module will appear as “TSA7804B”
• You don’t need a PIN, pair it and then you can play music

The highlight point is ADAU1701 DSP chip on board. User can set each channel audio tones separately. It is Apt-X and TWS supported. Therefore, users can stream audio to 2 paired amplifier boards at the same time wirelessly.

External buttons port:

There are 3 buttons on the board which can control the audio volume and play/pause. You can connect external buttons easily by using this buttons control port.

Pins (Check the board backside silkscreen):

• P/P: Play pause button
• VOL+: volume increase and forward button
• VOL-: volume decrease and rewind button
• 1.8V

Aux in enable port:

The default DSP program has combined the RCA/Bluetooth audio and output features on the amplifier chips. If you want to select the RCA/Bluetooth manually by a switch, you can connect an external switch to this port and load a different DSP program.

POT port:

User can connect an external 10K potentiometer to control the audio volume.

DSP programming port:

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

The onboard default DSP program combine the RCA & Bluetooth audio and output to the speakers. User can also change the DSP program to make the audio source selectable by an external switch.

 

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

 

Specification:

Specifications typical @ +25℃, Powered by 30V DC, unless otherwise noted. Specifications 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
	100W channel: RL= 2Ω, 1% THD+N			100W
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 @ 4Ohm	87%	–	92%

 

Features:

• Size: 13.5cm x 9.2cm x 3.4cm
• aptX, aptX Low Latency, SBC and AAC
• Bluetooth 5.0
• I2S Sampling Rate: 48KHz
• 4 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

Documents:

• How to change the BT name
• How to enable BT password
• How to change Bluetooth audio gains
• How to pair and set TWS mode
• ADI SigmaStudio software
• How to write DSP program to DSP board
• Default DSP program